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+# DUP - Duniter Protocol
+
+> This document reflects Duniter in-production protocol. It is updated only for clarifications (2017).
+
+## Contents
+
+* [Contents](#contents)
+* [Introduction](#introduction)
+* [Conventions](#conventions)
+ * [Documents](#documents)
+ * [Signatures](#signatures)
+* [Formats](#formats)
+ * [Public key](#public-key)
+ * [Identity](#identity)
+ * [Revocation](#revocation)
+ * [Certification](#certification)
+ * [Membership](#membership)
+ * [Block](#block)
+ * [Transaction](#transaction)
+ * [Peer](#peer)
+* [Variables](#variables)
+ * [Protocol parameters](#protocol-parameters)
+ * [Computed variables](#computed-variables)
+* [Processing](#processing)
+ * [Block](#block-1)
+ * [Peer](#peer-1)
+ * [Transaction](#transaction-1)
+* [Implementations](#implementations)
+* [References](#references)
+
+## Vocabulary
+
+Word | Description
+--------------------- | -------------
+UCP | Acronym for *UCoin Protocol*. A set of rules to create Duniter based currencies.
+Signature | The cryptographical act of certifying a document using a private key.
+WoT | Acronym for *Web of Trust*. A groupment of individuals recognizing each other's identity through public keys and certification mechanisms
+UD | Acronym for *Universal Dividend*. Means money issuance **directly** and **exclusively** by and to WoT members
+realtime | The time of real life (the habitual time).
+blocktime | The realtime recorded by a block.
+
+## Introduction
+
+UCP aims at defining a data format, an interpretation of it and processing rules in order to build coherent free currency systems in a P2P environment. UCP is to be understood as an *abstract* protocol since it defines currency parameters and rules about them, but not their value which is implementation specific.
+
+This document describes UCP in a bottom-up logic, so you will find first the details of the protocol (data format) to end with general protocol requirements.
+
+## Conventions
+
+### Documents
+
+#### Line endings
+
+Please note **very carefully** that every document's line **ENDS with a newline character**, *Unix-style*, that is to say `<LF>`.
+
+This is a *very important information* as every document is subject to hashes, and Windows-style endings won't produce the expected hashes.
+
+#### Numbering
+
+[Block](#block) numbering starts from `0`. That is, first block is `BLOCK#0`.
+
+#### Block identifiers
+
+There are 2 kinds of [Block](#block) identifiers:
+
+##### `BLOCK_ID`
+
+It is the number of the block. Its format is `INTEGER`, so it is a positive or zero integer.
+
+##### `BLOCK_UID`
+It is the concatenation of the `BLOCK_ID` of a block and hash. Its format is `BLOCK_ID-HASH`.
+
+##### Examples
+
+The block ID of the root block is `0`. Its UID *might be* `0-883228A23F8A75B342E912DF439738450AE94F5D`.
+The block ID of the block#433 is `433`. Its UID *might be* `433-FB11681FC1B3E36C9B7A74F4DDE2D07EC2637957`.
+
+> Note that it says "might be" because the hash is not known in advance.
+
+#### Currency name
+
+A valid currency name is composed of alphanumeric characters, spaces, `-` or `_` and has a length of 2 to 50 characters.
+
+#### Datesœ
+
+For any document using a date field, targeted date is to be understood as **UTC+0** reference.
+
+#### Integer
+
+Any integer field has a maximum length of 19 digits.
+
+### Signatures
+
+#### Format
+
+Signatures follow the [Ed25519 pattern](http://en.wikipedia.org/wiki/EdDSA), and are written under [Base64](http://en.wikipedia.org/wiki/Base64) encoding.
+
+Here is an example of an expected signature:
+
+ H41/8OGV2W4CLKbE35kk5t1HJQsb3jEM0/QGLUf80CwJvGZf3HvVCcNtHPUFoUBKEDQO9mPK3KJkqOoxHpqHCw==
+
+#### Line endings
+
+No new line character exists in a signature. However, a signature may be followed by a new line character, hence denoting the end of the signature.
+
+## Formats
+
+This section deals with the various data formats used by UCP.
+
+### Public key
+
+#### Definition
+
+A public key is to be understood as an [Ed25519](http://en.wikipedia.org/wiki/EdDSA) public key.
+
+Its format is a [Base58](http://en.wikipedia.org/wiki/Base58) string of 43 or 44 characters, such as the following:
+
+ HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY
+
+A public key is always paired with a private key, which UCP will never deal with. UCP only deals with public keys and signatures.
+
+### Identity
+
+#### Definition
+
+Issuing an identity is the act of creating a link between a *public key* and *an arbitrary identity*. In UCP, this link is done through the signature of an identity string by the private key corresponding to the public key. It is exactly like saying:
+
+> « This identity refers to me ! »
+
+#### Identity unique ID
+UCP does not rely on any particular identity format, which remains implementation free. Identity simply has to be a string of length between 2 and 100 characters avoiding usage of line ending characters.
+
+In this document *identifier*, `UserID`, `USER_ID` and `uid` will be indifferently used to refer to this identity string.
+
+#### Format
+
+An identity is a *signed* document containing the identifier:
+
+```yml
+Version: 10
+Type: Identity
+Currency: CURRENCY_NAME
+Issuer: PUBLIC_KEY
+UniqueID: USER_ID
+Timestamp: BLOCK_UID
+```
+
+Here, `USER_ID` has to be replaced with a valid identifier, `PUBLIC_KEY` with a valid public key and `BLOCK_UID` with a valid block unique ID. This document **is what signature is based upon**.
+
+The whole identity document is then:
+
+```yml
+Version: 10
+Type: Identity
+Currency: CURRENCY_NAME
+Issuer: PUBLIC_KEY
+UniqueID: USER_ID
+Timestamp: BLOCK_UID
+SIGNATURE
+```
+
+Where:
+
+* `CURRENCY_NAME` is a valid currency name
+* `USER_ID` is a valid user identity string
+* `PUBLIC_KEY` is a valid public key (base58 format)
+* `BLOCK_UID` refers to a [block unique ID], and represents a time reference.
+* `SIGNATURE` is a signature
+
+So the identity issuance is the act of saying:
+
+> « I attest, today, that this identity refers to me. »
+
+##### Example
+
+A valid identity:
+
+```yml
+Version: 10
+Type: Identity
+Currency: beta_brousouf
+Issuer: HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd
+UniqueID: lolcat
+Timestamp: 32-DB30D958EE5CB75186972286ED3F4686B8A1C2CD
+J3G9oM5AKYZNLAB5Wx499w61NuUoS57JVccTShUbGpCMjCqj9yXXqNq7dyZpDWA6BxipsiaMZhujMeBfCznzyci
+```
+
+### Revocation
+
+
+#### Definition
+
+An identity revocation is the act, for a given public key's owner, to revoke an identity they created for representing themself. Doing a self-revocation is exactly like saying:
+
+> « This identity I created makes no sense anymore. It has to be definitively locked. »
+
+#### Use case
+
+Its goal is only to inform that a created identity was either made by mistake, or contained a mistake, may have been compromised (private key stolen, lost...), or because for some reason you want to make yourself another identity.
+
+#### Format
+
+A revocation is a *signed* document gathering the identity informations to revoke:
+
+```yml
+Version: 10
+Type: Revocation
+Currency: CURRENCY_NAME
+Issuer: PUBLIC_KEY
+IdtyUniqueID: USER_ID
+IdtyTimestamp: BLOCK_UID
+IdtySignature: IDTY_SIGNATURE
+REVOCATION_SIGNATURE
+```
+
+Where:
+
+* `REVOCATION_SIGNATURE` is the signature over the document, `REVOCATION_SIGNATURE` excluded.
+
+#### Example
+
+If we have the following identity:
+
+```yml
+Version: 10
+Type: Identity
+Currency: beta_brousouf
+Issuer: HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd
+UniqueID: lolcat
+Timestamp: 32-DB30D958EE5CB75186972286ED3F4686B8A1C2CD
+J3G9oM5AKYZNLAB5Wx499w61NuUoS57JVccTShUbGpCMjCqj9yXXqNq7dyZpDWA6BxipsiaMZhujMeBfCznzyci
+```
+
+A valid revocation could be:
+
+```yml
+Version: 10
+Type: Revocation
+Currency: beta_brousouf
+Issuer: HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd
+IdtyUniqueID: lolcat
+IdtyTimestamp: 32-DB30D958EE5CB75186972286ED3F4686B8A1C2CD
+IdtySignature: J3G9oM5AKYZNLAB5Wx499w61NuUoS57JVccTShUbGpCMjCqj9yXXqNq7dyZpDWA6BxipsiaMZhujMeBfCznzyci
+SoKwoa8PFfCDJWZ6dNCv7XstezHcc2BbKiJgVDXv82R5zYR83nis9dShLgWJ5w48noVUHimdngzYQneNYSMV3rk
+```
+
+> The revocation actually *contains* the identity, so a program receiving a Revocation can extract the Identity and check the validity of its signature before processing the Revocation document.
+
+### Certification
+
+#### Definition
+
+A *certification* in UCP refers to the document *certifying* that someone else's identity is to consider as the unique reference to a living individual.
+
+#### Format
+
+A certification has the following format:
+
+```yml
+Version: 10
+Type: Certification
+Currency: CURRENCY_NAME
+Issuer: PUBLIC_KEY
+IdtyIssuer: IDTY_ISSUER
+IdtyUniqueID: USER_ID
+IdtyTimestamp: BLOCK_UID
+IdtySignature: IDTY_SIGNATURE
+CertTimestamp: BLOCK_UID
+CERTIFIER_SIGNATURE
+```
+
+Where:
+
+* `BLOCK_UID` refers to a block unique ID.
+* `CERTIFIER_SIGNATURE` is the signature of the *certifier*.
+
+#### Inline format
+
+Certifications may exist in an *inline format*, which describes the certification in a simple line. Here is the general structure:
+
+ PUBKEY_FROM:PUBKEY_TO:BLOCK_ID:SIGNATURE
+
+Where:
+
+ * `PUBKEY_FROM` is the certification public key
+ * `PUBKEY_TO` is the public key whose identity is being certified
+ * `BLOCK_ID` is the certification time reference
+ * `SIGNATURE` is the certification signature
+
+> Note: BLOCK_UID is not required in the inline format, since this format aims at being used in the context of a blockchain, where block_uid can be deduced.
+
+#### Example
+
+If we have the following complete self-certification:
+
+```yml
+Version: 10
+Type: Identity
+Currency: beta_brousouf
+Issuer: HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd
+UniqueID: lolcat
+Timestamp: 32-DB30D958EE5CB75186972286ED3F4686B8A1C2CD
+J3G9oM5AKYZNLAB5Wx499w61NuUoS57JVccTShUbGpCMjCqj9yXXqNq7dyZpDWA6BxipsiaMZhujMeBfCznzyci
+```
+
+A valid certification could be:
+
+```yml
+Version: 10
+Type: Certification
+Currency: beta_brousouf
+Issuer: DNann1Lh55eZMEDXeYt59bzHbA3NJR46DeQYCS2qQdLV
+IdtyIssuer: HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd
+IdtyUniqueID: lolcat
+IdtyTimestamp: 32-DB30D958EE5CB75186972286ED3F4686B8A1C2CD
+IdtySignature: J3G9oM5AKYZNLAB5Wx499w61NuUoS57JVccTShUbGpCMjCqj9yXXqNq7dyZpDWA6BxipsiaMZhujMeBfCznzyci
+CertTimestamp: 36-1076F10A7397715D2BEE82579861999EA1F274AC
+SoKwoa8PFfCDJWZ6dNCv7XstezHcc2BbKiJgVDXv82R5zYR83nis9dShLgWJ5w48noVUHimdngzYQneNYSMV3rk
+```
+
+### Membership
+
+In UCP, a member is represented by a public key they are supposed to own. To be integrated in a WoT, the newcomer owner of the key *has to express their will* to integrate the WoT.
+
+This step is done by issuing the following document:
+
+```yml
+Version: VERSION
+Type: Membership
+Currency: CURRENCY_NAME
+Issuer: ISSUER
+Block: M_BLOCK_UID
+Membership: MEMBERSHIP_TYPE
+UserID: USER_ID
+CertTS: BLOCK_UID
+```
+
+followed by a signature of the `Issuer`.
+
+#### Fields details
+
+Field | Description
+----- | -----------
+`Version` | Denotes the current structure version.
+`Type` | Type of the document.
+`Currency` | Contains the name of the currency.
+`Issuer` | The public key of the issuer.
+`Block` | Block number and hash. Value is used to target a blockchain and precise time reference for membership's time validity.
+`Membership` | Membership message. Value is either `IN` or `OUT` to express whether a member wishes to opt-in or opt-out the community.
+`UserID` | Identity to use for this public key
+`CertTS` | Identity's block UID
+
+#### Validity
+
+A [Membership](#membership) is to be considered having valid format if:
+
+* `Version` equals `2`
+* `Type` equals `Membership` value.
+* `Currency` is a valid currency name
+* `Issuer` is a public key
+* `Membership` matches either `IN` or `OUT` value
+* `Block` starts with an integer value, followed by a dash and an uppercased SHA1 string
+* `UserID` is a non-empty string
+* `CertTS` is a valid block UID
+
+### Transaction
+
+#### Definition
+
+Transaction is the support of money: it allows to materialize coins' ownership.
+
+#### Money ownership
+
+Money ownership **IS NOT** limited to members of the Community. Any owner (an individual or an organization) of a public key may own money: it only requires the key to match `Ouputs` of a transaction.
+
+#### Transfering money
+
+Obviously, coins a sender does not own CANNOT be sent by them. That is why a transaction refers to other transactions, to prove that the sender actually owns the coins they want to send.
+
+#### Format
+
+A transaction is defined by the following format:
+
+```yml
+Version: VERSION
+Type: Transaction
+Currency: CURRENCY_NAME
+Blockstamp: BLOCK_UID
+Locktime: INTEGER
+Issuers:
+PUBLIC_KEY
+...
+Inputs:
+INPUT
+...
+Unlocks:
+UNLOCK
+...
+Outputs:
+AMOUNT:BASE:CONDITIONS
+...
+Comment: COMMENT
+SIGNATURES
+...
+```
+
+Here is a description of each field:
+
+Field | Description
+----- | -----------
+`Version` | denotes the current structure version
+`Type` | type of the document
+`Currency` | contains the name of the currency
+`Blockstamp` | a block reference as timestamp of the transaction
+`Locktime` | waiting delay to be included in the blockchain
+`Issuers` | a list of public keys
+`Inputs` | a list of money sources
+`Unlocks` | a list of values justifying inputs consumption
+`Outputs` | a list of amounts and conditions to unlock them
+`Comment` | a comment to write on the transaction
+
+#### Validity
+
+A Transaction structure is considered *valid* if:
+
+* Field `Version` equals `2` or `3`.
+* Field `Type` equals `Transaction`.
+* Field `Currency` is not empty.
+* Field `Blockstamp` is a block UID
+* Field `Locktime` is an integer
+* Field `Issuers` is a multiline field whose lines are public keys.
+* Field `Inputs` is a multiline field whose lines match either:
+ * `AMOUNT:BASE:D:PUBLIC_KEY:BLOCK_ID` format
+ * `AMOUNT:BASE:T:T_HASH:T_INDEX` format
+* Field `Unlocks` is a multiline field whose lines follow `INDEX:UL_CONDITIONS` format:
+ * `IN_INDEX` must be an integer value
+ * `UL_CONDITIONS` must be a valid [Input Condition](#input-condition)
+* Field `Outputs` is a multiline field whose lines follow `AMOUNT:BASE:CONDITIONS` format:
+ * `AMOUNT` must be an integer value
+ * `BASE` must be an integer value
+ * `CONDITIONS` must be a valid [Output Condition](#output-condition)
+* Field `Comment` is a string of maximum 255 characters, exclusively composed of alphanumeric characters, space, `-`, `_`, `:`, `/`, `;`, `*`, `[`, `]`, `(`, `)`, `?`, `!`, `^`, `+`, `=`, `@`, `&`, `~`, `#`, `{`, `}`, `|`, `\`, `<`, `>`, `%`, `.`. Must be present even if empty.
+
+#### Input condition
+
+It is a suite of values each separated by a space "` `". Values must be either a `SIG(INDEX)` or `HXH(INTEGER)`.
+
+If no values are provided, the valid input condition is an empty string.
+
+##### Input condition examples
+
+* `SIG(0)`
+* `XHX(73856837)`
+* `SIG(0) SIG(2) XHX(343)`
+* `SIG(0) SIG(2) SIG(4) SIG(6)`
+
+#### Output condition
+
+It follows a machine-readable BNF grammar composed of
+
+* `(` and `)` characters
+* `&&` and `||` operators
+* `SIG(PUBLIC_KEY)`, `XHX(SHA256_HASH)`, `CLTV(INTEGER)`, `CSV(INTEGER)` functions
+* ` ` space
+
+**An empty condition or a condition fully composed of spaces is considered an invalid output condition**.
+
+Also, the maximum length of a condition is 1000 characters. // TODO: OK?
+
+##### Output condition examples
+
+* `SIG(HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd)`
+* `(SIG(HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd) && XHX(309BC5E644F797F53E5A2065EAF38A173437F2E6))`
+* `(SIG(HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd) && CSV(3600))`
+* `(SIG(HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd) && (CLTV(1489677041) || CSV(3600)))`
+* `(SIG(HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd) || (SIG(DNann1Lh55eZMEDXeYt59bzHbA3NJR46DeQYCS2qQdLV) && XHX(309BC5E644F797F53E5A2065EAF38A173437F2E6)))`
+
+#### Condition matching
+
+Considering a transaction `TX` consuming some money: each unlock line `UNLOCK` of TX tries to unlock the input `INPUT = TX.Inputs[IN_INDEX]` refering to an ouput `Output` whose value is:
+
+If `INPUT.TYPE = 'T'`:
+
+ Output = TRANSACTIONS_IN_BLOCKCHAIN_OR_IN_LOCAL_BLOCK[T_HASH].OUPUTS[T_INDEX]
+
+If `INPUT.TYPE = 'D'`:
+
+ Output = BLOCKCHAIN[BLOCK_ID].Dividend[PUBLIC_KEY]
+
+Let's name:
+
+* `CONDITIONS` the conditions of a given output `Output`
+* `NB_FUNCTIONS` the number of functions present in `CONDITIONS` (read from left to right)
+* `NB_PARAMETERS` the number of parameters present in `UNLOCK`, each separated by a space (read from left to right)
+
+Then, an `UNLOCK` line is considered *successful* if:
+
+* `Output` exists
+* `NB_PARAMETERS <= NB_FUNCTIONS`
+* Each `UNLOCK` parameter returns TRUE
+* `CONDITIONS` evaluated globally with `(`, `)`, `&&`, `||` and its locking functions returns TRUE
+
+##### Example 1
+
+TX1:
+
+```yml
+Outputs:
+50:2:XHX(8AFC8DF633FC158F9DB4864ABED696C1AA0FE5D617A7B5F7AB8DE7CA2EFCD4CB)
+```
+
+Is resolved by TX2:
+
+```yml
+Unlocks:
+0:XHX(1872767826647264)
+```
+
+Because `XHX(1872767826647264) = 8AFC8DF633FC158F9DB4864ABED696C1AA0FE5D617A7B5F7AB8DE7CA2EFCD4CB` (this will be explained in the next section).
+
+##### Example 2
+
+TX1:
+
+```yml
+Outputs:
+50:2:SIG(DKpQPUL4ckzXYdnDRvCRKAm1gNvSdmAXnTrJZ7LvM5Qo)
+```
+
+Is resolved by TX2:
+
+```yml
+Issuers:
+HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd
+DKpQPUL4ckzXYdnDRvCRKAm1gNvSdmAXnTrJZ7LvM5Qo
+[...]
+Unlocks:
+0:SIG(1)
+```
+
+Because `SIG(1)` refers to the signature `DKpQPUL4ckzXYdnDRvCRKAm1gNvSdmAXnTrJZ7LvM5Qo`, considering that signature `DKpQPUL4ckzXYdnDRvCRKAm1gNvSdmAXnTrJZ7LvM5Qo` is good over TX2.
+
+#### Locking and unlocking functions
+
+The *locking* functions are present under `Outputs` field.
+
+The *unlocking* functions are present under `Unlocks` field.
+
+##### SIG function
+
+###### Definition
+
+Lock:
+
+ SIG(PUBKEY_A)
+
+Unlock:
+
+ SIG(INDEX)
+
+###### Condition
+
+Lock `SIG(PUBKEY_A)` returns TRUE if it exists a parameter `SIG(INDEX)` returning TRUE where `Issuers[INDEX] == PUBKEY_A`.
+
+Unlock `SIG(INDEX)` returns TRUE if `Signatures[INDEX]` is a valid valid signature of TX against `Issuers[INDEX]` public key.
+
+###### Description
+
+This function is a control over the signature.
+
+* in an `Output` of a transaction TX1, `SIG(PUBKEY_A)` requires from a future transaction TX2 unlocking the output to give as parameter a valid signature of TX2 by `PUBKEY_A`
+ * if TX2 does not give `SIG(INDEX)` parameter as [matching parameter](#condition-matching), the condition fails
+ * if TX2's `Issuers[INDEX]` does not equal `PUBKEY_A`, the condition fails
+ * if TX2's `SIG(INDEX)` does not return TRUE, the condition fails
+* in an `Unlock` of TX2, `SIG(INDEX)` returns TRUE if `Signatures[INDEX]` is a valid signature of TX2 against `Issuers[INDEX]`
+
+So if we have, in TX1:
+
+```yml
+Version: 10
+Type: Transaction
+[...]
+Outputs
+25:2:SIG(BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g)
+```
+
+Then the `25` units can be spent *exclusively* in a future transaction TX2 which looks like:
+
+```yml
+Version: 10
+Type: Transaction
+[...]
+Issuers:
+BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g
+Inputs:
+25:2:T:6991C993631BED4733972ED7538E41CCC33660F554E3C51963E2A0AC4D6453D3:0
+Unlocks:
+0:SIG(0)
+```
+
+Where:
+
+* `SIG(0)` refers to the signature of `Issuers[0]`, here `BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g`
+* `6991C993631BED4733972ED7538E41CCC33660F554E3C51963E2A0AC4D6453D3` is the hash of TX1.
+
+The necessary condition `SIG(BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g)` is matched here if **both**:
+
+* the sufficient proof `SIG(0)` is a valid signature of TX2 against `Issuers[0]` public key
+* `Issuers[0] = BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g`
+
+
+##### XHX function
+
+###### Definition
+
+Lock:
+
+ XHX(HASH)
+
+Unlock:
+
+ XHX(PASSWORD)
+
+###### Condition
+
+`XHX(HASH)` returns true if it exists a parameter `XHX(PASSWORD)` where `SHA256(PASSWORD) = HASH`.
+
+`XHX(PASSWORD)` returns true if it exists a locking function `XHX(HASH)` where `SHA256(PASSWORD) = HASH` in the conditions.
+
+###### Description
+
+This function is a password control.
+
+So if we have, in TX1:
+
+```yml
+Version: 10
+Type: Transaction
+[...]
+Outputs
+25:2:XHX(8AFC8DF633FC158F9DB4864ABED696C1AA0FE5D617A7B5F7AB8DE7CA2EFCD4CB)
+```
+
+Then the `25` units can be spent *exclusively* in a future transaction TX2 which looks like:
+
+```yml
+Version: 10
+Type: Transaction
+[...]
+Issuers:
+BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g
+Inputs:
+55:1:T:6991C993631BED4733972ED7538E41CCC33660F554E3C51963E2A0AC4D6453D3:0
+Unlocks:
+0:XHX(1872767826647264)
+```
+
+Where:
+
+* `6991C993631BED4733972ED7538E41CCC33660F554E3C51963E2A0AC4D6453D3` is the hash of TX1.
+
+Then `XHX(PASSWORD)` returns TRUE if it exists `XHX(HASH)` in the output's conditions of TX1, with the relation `SHA256(PASSWORD) = HASH`.
+
+Here `XHX(1872767826647264)` returns TRUE if it exists `XHX(8AFC8DF633FC158F9DB4864ABED696C1AA0FE5D617A7B5F7AB8DE7CA2EFCD4CB)` in the output's conditions of TX1, as it matches the link `SHA256(1872767826647264) = 8AFC8DF633FC158F9DB4864ABED696C1AA0FE5D617A7B5F7AB8DE7CA2EFCD4CB`.
+
+#### Example 1
+
+Key `HsLShA` sending 25 coins to key `BYfWYF` using 1 source transaction written in block #3.
+
+```yml
+Version: 10
+Type: Transaction
+Currency: beta_brousouf
+Blockstamp: 204-00003E2B8A35370BA5A7064598F628A62D4E9EC1936BE8651CE9A85F2E06981B
+Locktime: 0
+Issuers:
+HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY
+Inputs:
+30:0:T:8361C993631BED4733972ED7538E41CCC33660F554E3C51963E2A0AC4D6453D3:3
+Unlocks:
+0:SIG(0)
+Outputs:
+25:0:SIG(BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g)
+5:0:SIG(HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY)
+Comment: First transaction
+```
+
+Signatures (fake here):
+
+ 42yQm4hGTJYWkPg39hQAUgP6S6EQ4vTfXdJuxKEHL1ih6YHiDL2hcwrFgBHjXLRgxRhj2VNVqqc6b4JayKqTE14r
+
+#### Example 2
+
+Key `HsLShA` sending 30 coins (base 2) to key `BYfWYF` using 2 sources transaction written in blocks #65 and #77 + 1 UD from block #88.
+
+```yml
+Version: 10
+Type: Transaction
+Currency: beta_brousouf
+Blockstamp: 204-00003E2B8A35370BA5A7064598F628A62D4E9EC1936BE8651CE9A85F2E06981B
+Locktime: 0
+Issuers:
+HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY
+Inputs:
+6:2:T:6991C993631BED4733972ED7538E41CCC33660F554E3C51963E2A0AC4D6453D3:0
+20:2:T:3A09A20E9014110FD224889F13357BAB4EC78A72F95CA03394D8CCA2936A7435:10
+40:1:D:HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY:88
+Unlocks:
+0:SIG(0)
+1:SIG(0)
+2:SIG(0)
+Outputs:
+30:2:SIG(BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g)
+Comment:
+```
+
+Signatures (fake here):
+
+ 42yQm4hGTJYWkPg39hQAUgP6S6EQ4vTfXdJuxKEHL1ih6YHiDL2hcwrFgBHjXLRgxRhj2VNVqqc6b4JayKqTE14r
+
+#### Example 3
+
+Key `HsLShA`, `CYYjHs` and `9WYHTa` sending 235 coins to key `BYfWYF` using 4 sources transaction + 2 UD from same block #46.
+
+```yml
+Version: 10
+Type: Transaction
+Currency: beta_brousouf
+Blockstamp: 204-00003E2B8A35370BA5A7064598F628A62D4E9EC1936BE8651CE9A85F2E06981B
+Locktime: 0
+Issuers:
+HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY
+CYYjHsNyg3HMRMpTHqCJAN9McjH5BwFLmDKGV3PmCuKp
+9WYHTavL1pmhunFCzUwiiq4pXwvgGG5ysjZnjz9H8yB
+Inputs:
+40:2:T:6991C993631BED4733972ED7538E41CCC33660F554E3C51963E2A0AC4D6453D3:2
+70:2:T:3A09A20E9014110FD224889F13357BAB4EC78A72F95CA03394D8CCA2936A7435:8
+20:2:D:HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY:46
+70:2:T:A0D9B4CDC113ECE1145C5525873821398890AE842F4B318BD076095A23E70956:3
+20:2:T:67F2045B5318777CC52CD38B424F3E40DDA823FA0364625F124BABE0030E7B5B:5
+15:2:D:9WYHTavL1pmhunFCzUwiiq4pXwvgGG5ysjZnjz9H8yB:46
+Unlocks:
+0:SIG(0)
+1:XHX(7665798292)
+2:SIG(0)
+3:SIG(0) SIG(2)
+4:SIG(0) SIG(1) SIG(2)
+5:SIG(2)
+Outputs:
+120:2:SIG(BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g)
+146:2:SIG(DSz4rgncXCytsUMW2JU2yhLquZECD2XpEkpP9gG5HyAx)
+49:2:(SIG(6DyGr5LFtFmbaJYRvcs9WmBsr4cbJbJ1EV9zBbqG7A6i) || XHX(3EB4702F2AC2FD3FA4FDC46A4FC05AE8CDEE1A85))
+Comment: -----@@@----- (why not this comment?)
+```
+
+Signatures (fakes here):
+
+ 42yQm4hGTJYWkPg39hQAUgP6S6EQ4vTfXdJuxKEHL1ih6YHiDL2hcwrFgBHjXLRgxRhj2VNVqqc6b4JayKqTE14r
+ 2D96KZwNUvVtcapQPq2mm7J9isFcDCfykwJpVEZwBc7tCgL4qPyu17BT5ePozAE9HS6Yvj51f62Mp4n9d9dkzJoX
+ 2XiBDpuUdu6zCPWGzHXXy8c4ATSscfFQG9DjmqMZUxDZVt1Dp4m2N5oHYVUfoPdrU9SLk4qxi65RNrfCVnvQtQJk
+
+##### CLTV function
+
+###### Definition
+
+Lock:
+
+ CLVT(TIMESTAMP)
+
+Unlock: no unlocking function.
+
+###### Condition
+
+`CLVT(TIMESTAMP)` returns true if and only if the transaction including block's `MedianTime >= TIMESTAMP`.
+
+###### Description
+
+This function locks an output in the future, which will be unlocked at a given date.
+
+So if we have, in TX1:
+
+```yml
+Version: 10
+Type: Transaction
+[...]
+Outputs
+25:2:CLTV(1489677041)
+```
+
+So here, the `25` units can be spent *exclusively* in a block whose `MedianTime >= 1489677041`
+
+`CLTV`'s parameter must be an integer with a length between `1` and `10` chars.
+
+##### CSV function
+
+###### Definition
+
+Lock:
+
+ CSV(DELAY)
+
+Unlock: no unlocking function.
+
+We define `TxTime` as the `MedianTime` of the block referenced by the transaction's `Blockstamp` field.
+
+###### Condition
+
+`CSV(DELAY)` returns true if and only if the transaction including block's `MedianTime - TxTime >= DELAY`.
+
+###### Description
+
+This function locks an output in the future, which will be unlocked after the given amount of time has elapsed.
+
+So if we have, in TX1:
+
+```yml
+Version: 10
+Type: Transaction
+Currency: beta_brousouf
+Blockstamp: 204-00003E2B8A35370BA5A7064598F628A62D4E9EC1936BE8651CE9A85F2E06981B
+[...]
+Outputs
+25:2:CSV(3600)
+```
+
+Then the `25` units can be spent *exclusively* in a block whose `MedianTime - TxTime >= 3600`.
+
+`CSV`'s parameter must be an integer with a length between `1` and `8` chars.
+
+#### Compact format
+
+A transaction may be described with a more compact format, to be used in a [Block](#block) document. The general format is:
+
+```yml
+TX:VERSION:NB_ISSUERS:NB_INPUTS:NB_UNLOCKS:NB_OUTPUTS:HAS_COMMENT:LOCKTIME
+BLOCKSTAMP
+PUBLIC_KEY
+...
+INPUT
+...
+UNLOCK
+...
+OUTPUT
+...
+COMMENT
+SIGNATURE
+...
+```
+
+Here is an example compacting [example 2](#example-2) from above:
+
+```yml
+TX:10:1:3:1:0:0
+204-00003E2B8A35370BA5A7064598F628A62D4E9EC1936BE8651CE9A85F2E06981B
+HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY
+6:2:T:6991C993631BED4733972ED7538E41CCC33660F554E3C51963E2A0AC4D6453D3:0
+20:2:T:3A09A20E9014110FD224889F13357BAB4EC78A72F95CA03394D8CCA2936A7435:10
+40:1:D:HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY:88
+0:SIG(0)
+1:SIG(0)
+2:SIG(0)
+30:2:SIG(BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g)
+42yQm4hGTJYWkPg39hQAUgP6S6EQ4vTfXdJuxKEHL1ih6YHiDL2hcwrFgBHjXLRgxRhj2VNVqqc6b4JayKqTE14r
+```
+
+Here is an example compacting [example 3](#example-3) from above:
+
+```yml
+TX:10:3:6:3:1:0
+204-00003E2B8A35370BA5A7064598F628A62D4E9EC1936BE8651CE9A85F2E06981B
+HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY
+CYYjHsNyg3HMRMpTHqCJAN9McjH5BwFLmDKGV3PmCuKp
+9WYHTavL1pmhunFCzUwiiq4pXwvgGG5ysjZnjz9H8yB
+40:2:T:6991C993631BED4733972ED7538E41CCC33660F554E3C51963E2A0AC4D6453D3:2
+70:2:T:3A09A20E9014110FD224889F13357BAB4EC78A72F95CA03394D8CCA2936A7435:8
+20:2D:HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY:46
+70:2:T:A0D9B4CDC113ECE1145C5525873821398890AE842F4B318BD076095A23E70956:3
+20:2:T:67F2045B5318777CC52CD38B424F3E40DDA823FA0364625F124BABE0030E7B5B:5
+15:2:D:9WYHTavL1pmhunFCzUwiiq4pXwvgGG5ysjZnjz9H8yB:46
+0:SIG(0)
+1:XHX(7665798292)
+2:SIG(0)
+3:SIG(0) SIG(2)
+4:SIG(0) SIG(1) SIG(2)
+5:SIG(2)
+120:2:SIG(BYfWYFrsyjpvpFysgu19rGK3VHBkz4MqmQbNyEuVU64g)
+146:2:SIG(DSz4rgncXCytsUMW2JU2yhLquZECD2XpEkpP9gG5HyAx)
+49:2:(SIG(6DyGr5LFtFmbaJYRvcs9WmBsr4cbJbJ1EV9zBbqG7A6i) || XHX(3EB4702F2AC2FD3FA4FDC46A4FC05AE8CDEE1A85))
+-----@@@----- (why not this comment?)
+42yQm4hGTJYWkPg39hQAUgP6S6EQ4vTfXdJuxKEHL1ih6YHiDL2hcwrFgBHjXLRgxRhj2VNVqqc6b4JayKqTE14r
+2D96KZwNUvVtcapQPq2mm7J9isFcDCfykwJpVEZwBc7tCgL4qPyu17BT5ePozAE9HS6Yvj51f62Mp4n9d9dkzJoX
+2XiBDpuUdu6zCPWGzHXXy8c4ATSscfFQG9DjmqMZUxDZVt1Dp4m2N5oHYVUfoPdrU9SLk4qxi65RNrfCVnvQtQJk
+```
+
+### Block
+
+A Block is a document gathering both:
+
+ * [Public key](#publickey) data in order to build a Web Of Trust (WoT) representation
+ * [Transaction](#transaction) data to identify money units & ownership
+
+but also other informations like:
+
+* time reference (calendar time)
+* UD value for money issuance
+
+#### Structure
+
+```yml
+Version: VERSION
+Type: Block
+Currency: CURRENCY
+Number: BLOCK_ID
+PoWMin: NUMBER_OF_ZEROS
+Time: GENERATED_ON
+MedianTime: MEDIAN_DATE
+UniversalDividend: DIVIDEND_AMOUNT
+UnitBase: UNIT_BASE
+Issuer: ISSUER_KEY
+IssuersFrame: ISSUERS_FRAME
+IssuersFrameVar: ISSUERS_FRAME_VAR
+DifferentIssuersCount: ISSUER_KEY
+PreviousHash: PREVIOUS_HASH
+PreviousIssuer: PREVIOUS_ISSUER_KEY
+Parameters: PARAMETERS
+MembersCount: WOT_MEM_COUNT
+Identities:
+PUBLIC_KEY:SIGNATURE:I_BLOCK_UID:USER_ID
+...
+Joiners:
+PUBLIC_KEY:SIGNATURE:M_BLOCK_UID:I_BLOCK_UID:USER_ID
+...
+Actives:
+PUBLIC_KEY:SIGNATURE:M_BLOCK_UID:I_BLOCK_UID:USER_ID
+...
+Leavers:
+PUBLIC_KEY:SIGNATURE:M_BLOCK_UID:I_BLOCK_UID:USER_ID
+...
+Revoked:
+PUBLIC_KEY:SIGNATURE
+...
+Excluded:
+PUBLIC_KEY
+...
+Certifications:
+PUBKEY_FROM:PUBKEY_TO:BLOCK_ID:SIGNATURE
+...
+Transactions:
+COMPACT_TRANSACTION
+...
+InnerHash: BLOCK_HASH
+Nonce: NONCE
+BOTTOM_SIGNATURE
+```
+
+Field | Data | Mandatory?
+--------------------- | ------------------------------------------------- | ------------
+Version | The document version | Always
+Type | The document type | Always
+Currency | The currency name | Always
+Number | The block number | Always
+PoWMin | The current minimum PoW difficulty | Always
+Time | Time of generation | Always
+MedianTime | Median date | Always
+UniversalDividend | Universal Dividend amount | **Optional**
+UnitBase | Universal Dividend unit base (power of 10) | Always in V3, **Optional** in V2
+Issuer | This block's issuer's public key | Always
+IssuersFrame | The size of the frame to look for issuers | Always
+IssuersFrameVar | A counter to increment/decrement IssuersFrame | Always
+DifferentIssuersCount | The count of unique issuers of blocks | Always
+PreviousHash | Previous block fingerprint (SHA256) | from Block#1
+PreviousIssuer | Previous block issuer's public key | from Block#1
+Parameters | Currency parameters. | **Block#0 only**
+MembersCount | Number of members in the WoT, this block included | Always
+Identities | New identities in the WoT | Always
+Joiners | `IN` memberships | Always
+Actives | `IN` memberships (renewal) | Always
+Leavers | `OUT` memberships | Always
+Revoked | Revocation documents | Always
+Excluded | Exluded members' public key | Always
+Transactions | A list of compact transactions | Always
+InnerHash | The hash value of the block's inner content | Always
+Nonce | An arbitrary nonce value | Always
+BlockHash | Hash from `InnerHash: ` to `SIGNATURE` | Virtual
+BlockSize | Hash from `InnerHash: ` to `SIGNATURE` | Virtual
+
+##### BlockSize
+
+The block size is defined as the number of lines in multiline fields (`Identities`, `Joiners`, `Actives`, `Leavers`, `Revoked`, `Certifications`, `Transactions`) **except** `Excluded` field.
+
+For example:
+
+* 1 new identity + 1 joiner + 2 certifications = 4 lines sized block
+* 1 new identity + 1 joiner + 2 certifications + 5 lines transaction = 9 lines sized block
+
+#### Coherence
+
+To be valid, a block must match the following rules:
+
+##### Format
+
+* `Version`, `Nonce`, `Number`, `PoWMin`, `Time`, `MedianTime`, `MembersCount`, `UniversalDividend`, `UnitBase`, `IssuersFrame`, `IssuersFrameVar` and `DifferentIssuersCount` are integer values
+* `Currency` is a valid currency name
+* `PreviousHash` is an uppercased SHA256 hash
+* `Issuer` and `PreviousIssuer` are [Public keys](#publickey)
+* `Identities` is a multiline field composed for each line of:
+ * `PUBLIC_KEY` : a [Public key](#publickey)
+ * `SIGNATURE` : a [Signature](#signature)
+ * `BLOCK_UID` : a block UID
+ * `USER_ID` : an identifier
+* `Joiners`, `Actives` and `Leavers` are multiline fields composed for each line of:
+ * `PUBLIC_KEY` : a [Public key](#publickey)
+ * `SIGNATURE` : a [Signature](#signature)
+ * `M_BLOCK_UID` : a block UID
+ * `I_BLOCK_UID` : a block UID
+ * `USER_ID` : an identifier
+* `Revoked` is a multiline field composed for each line of:
+ * `SIGNATURE` : a [Signature](#signature)
+ * `USER_ID` : an identifier
+* `Excluded` is a multiline field composed for each line of:
+ * `PUBLIC_KEY` : a [Public key](#publickey)
+* `Certifications` is a multiline field composed for each line of:
+ * `PUBKEY_FROM` : a [Public key](#publickey) doing the certification
+ * `PUBKEY_TO` : a [Public key](#publickey) being certified
+ * `BLOCK_ID` : a positive integer
+ * `SIGNATURE` : a [Signature](#signature) of the certification
+* `Transactions` is a multiline field composed of [compact transactions](#compact-format)
+* `Parameters` is a simple line field, composed of 1 float, 12 integers and 1 last float all separated by a colon `:`, and representing [currency parameters](#protocol-parameters) (a.k.a Protocol parameters, but valued for a given currency):
+
+ c:dt:ud0:sigPeriod:sigStock:sigWindow:sigValidity:sigQty:idtyWindow:msWindow:xpercent:msValidity:stepMax:medianTimeBlocks:avgGenTime:dtDiffEval:percentRot:udTime0:udReevalTime0:dtReeval
+
+The document must be ended with a `BOTTOM_SIGNATURE` [Signature](#signature).
+
+##### Data
+
+* `Version` equals `6`
+* `Type` equals `Block`
+
+### Peer
+
+UCP uses P2P networks to manage community and money data. Since only members can write to the Blockchain, it is important to have authenticated peers so newly validated blocks can be efficiently sent to them, without any ambiguity.
+
+For that purpose, UCP defines a peering table containing, for a given node's public key:
+
+* a currency name
+* a list of endpoints to contact the node
+
+This link is made through a document called *Peer* whose format is described below.
+
+#### Structure
+
+```yml
+Version: VERSION
+Type: Peer
+Currency: CURRENCY_NAME
+Issuer: NODE_PUBLICKEY
+Block: BLOCK
+Endpoints:
+END_POINT_1
+END_POINT_2
+END_POINT_3
+[...]
+```
+
+With the signature attached, this document certifies that this public key is owned by this server at given network endpoints.
+
+The aggregation of all *Peer* documents is called the *peering table*, and allows to authentify addresses of all nodes identified by their public keys.
+
+#### Fields details
+
+Field | Description
+----- | -----------
+`Version` | denotes the current structure version.
+`Type` | the document type.
+`Currency` | contains the name of the currency.
+`Issuer` | the node's public key.
+`Block` | block number and hash. Value is used to target a blockchain and precise time reference.
+`Endpoints` | a list of endpoints to interact with the node
+
+`Endpoints` has a particular structure. It is made up of at least one line, with each line following this format:
+
+ PROTOCOL_NAME[ OPTIONS]
+ [...]
+
+For example, the first written Duniter peering protocol is BASIC_MERKLED_API, which defines an HTTP API. An endpoint of such protocol would look like:
+
+ BASIC_MERKLED_API[ DNS][ IPv4][ IPv6] PORT
+
+Where :
+
+Field | Description
+----- | -----------
+`DNS` | is the dns name to access the node.
+`IPv4` | is the IPv4 address to access the node.
+`IPv6` | is the IPv6 address to access the node.
+`PORT` | is the port of the address to access the node.
+
+#### Coherence
+
+To be valid, a peer document must match the following rules:
+
+##### Format
+
+* `Version` equals `2` or `3`
+* `Type` equals `Peer`
+* `Currency` is a valid currency name
+* `PublicKey` is a [Public key](#publickey)
+* `Endpoints` is a multiline field
+
+The document must be ended with a `BOTTOM_SIGNATURE` [Signature](#signature).
+
+#### Example
+
+```yml
+Version: 10
+Type: Peer
+Currency: beta_brousouf
+PublicKey: HsLShAtzXTVxeUtQd7yi5Z5Zh4zNvbu8sTEZ53nfKcqY
+Block: 8-1922C324ABC4AF7EF7656734A31F5197888DDD52
+Endpoints:
+BASIC_MERKLED_API some.dns.name 88.77.66.55 2001:0db8:0000:85a3:0000:0000:ac1f 9001
+BASIC_MERKLED_API some.dns.name 88.77.66.55 2001:0db8:0000:85a3:0000:0000:ac1f 9002
+OTHER_PROTOCOL 88.77.66.55 9001
+```
+
+## Variables
+
+### Protocol parameters
+
+Parameter | Goal
+----------- | ----
+c | The %growth of the UD every `[dt]` period
+dt | Time period between two UD.
+dtReeval | Time period between two re-evaluation of the UD.
+ud0 | UD(0), i.e. initial Universal Dividend
+udTime0 | Time of first UD.
+udReevalTime0 | Time of first reevaluation of the UD.
+sigPeriod | Minimum delay between 2 certifications of a same issuer, in seconds. Must be positive or zero.
+msPeriod | Minimum delay between 2 memberships of a same issuer, in seconds. Must be positive or zero.
+sigReplay | Minimum delay between 2 certifications of a same issuer to a same receiver, in seconds. Equals to `msPeriod`.
+sigStock | Maximum quantity of active certifications made by member.
+sigWindow | Maximum delay a certification can wait before being expired for non-writing.
+sigValidity | Maximum age of an active signature (in seconds)
+sigQty | Minimum quantity of signatures to be part of the WoT
+idtyWindow | Maximum delay an identity can wait before being expired for non-writing.
+msWindow | Maximum delay a membership can wait before being expired for non-writing.
+xpercent | Minimum percent of sentries to reach to match the distance rule
+msValidity | Maximum age of an active membership (in seconds)
+stepMax | Maximum distance between each WoT member and a newcomer
+medianTimeBlocks | Number of blocks used for calculating median time.
+avgGenTime | The average time for writing 1 block (wished time)
+dtDiffEval | The number of blocks required to evaluate again `PoWMin` value
+percentRot | The percent of previous issuers to reach for personalized difficulty
+txWindow | `= 3600 * 24 * 7`. Maximum delay a transaction can wait before being expired for non-writing.
+
+### Computed variables
+
+Variable | Meaning
+--------- | ----
+members | Synonym of `members(t = now)`, `wot(t)`, `community(t)` targeting the keys whose last active (non-expired) membership is either in `Joiners` or `Actives`.
+maxGenTime | `= CEIL(avgGenTime * 1.189)`
+minGenTime | `= FLOOR(avgGenTime / 1.189)`
+minSpeed | 1 / maxGenTime
+maxSpeed | 1 / minGenTime
+maxAcceleration | `= CEIL(maxGenTime * medianTimeBlocks)`
+
+## Processing
+
+### Block
+
+A Block can be accepted only if it respects a set of rules, here divided in 2 parts : *local* and *global*.
+
+#### Local validation
+
+Local validation verifies the coherence of a well-formatted block, without any other context than the block itself.
+
+##### Version
+
+Rule:
+
+ HEAD.version == 10 || HEAD.version == 11
+
+##### InnerHash
+
+* `InnerHash` is the SHA256 hash of the whole fields from `Version:` to `\InnerHash`, the 'InnerHash' string being excluded from the hash computation.
+
+##### Nonce
+
+* `Nonce` value may be any zero or positive integer. This field is a special field allowing for document hash to change for proof-of-work computation.
+
+##### Proof of work
+
+To be valid, the BlockHash must start with a specific number of zeros. Locally, this hash must start with at least `NB_ZEROS` zeros:
+
+ REMAINDER = PowMin % 16
+ NB_ZEROS = (PowMin - REMAINDER) / 16
+
+##### PreviousHash
+
+* `PreviousHash` must be present if the value of the `Number` field is greater than `0`.
+* `PreviousHash` must not be present if the value of the `Number` field is equal to `0`.
+
+##### PreviousIssuer
+
+* `PreviousIssuer` must be present if the value of the `Number` field is greater than `0`.
+* `PreviousIssuer` must not be present if the value of the `Number` field is equal to `0`.
+
+##### Parameters
+
+* `Parameters` must be present if the value of the `Number` field is equal to `0`.
+* `Parameters` must not be present if the value of the `Number` field is greater than `0`.
+
+##### Universal Dividend
+
+If HEAD.number == 0, HEAD.dividend must equal `null`.
+
+##### UnitBase
+
+* Block V2:
+ * If `UniversalDividend` field is present, `UnitBase` must be present too.
+* Block V3:
+ * The field is always present.
+ * For root block, `UnitBase` must equal `0`.
+
+##### Signature
+
+* A block must have a valid signature over the content from `Hash: ` to `Nonce: NONCE\n`, where the associated public key is the block's `Issuer` field.
+
+##### Dates
+
+* A block must have its `Time` field be between [`MedianTime` ; `MedianTime` + `maxAcceleration`].
+* Root block's `Time` & `MedianTime` must be equal.
+
+##### Identities
+
+A block cannot contain identities whose signature does not match the identity's content
+
+##### Memberships (Joiners, Actives, Leavers)
+
+A block cannot contain memberships whose signature does not match the membership's content
+
+##### Revoked
+
+A block cannot contain revocations whose signature does not match the revocation's content
+
+##### Transactions
+
+* A transaction in compact format cannot measure more than 100 lines
+* A transaction must have at least 1 source
+* A transaction cannot have `SIG(INDEX)` unlocks with `INDEX >= ` issuers count.
+* A transaction **must** have signatures matching its content **for each issuer**
+* A transaction's version must be equal to `3`
+* Signatures count must be the same as issuers count
+* Signatures are ordered by issuer
+* Signatures are made over the transaction's content, signatures excepted
+
+##### INDEX GENERATION
+
+##### Identities
+
+Each identity produces 2 new entries:
+
+ IINDEX (
+ op = 'CREATE'
+ uid = USER_ID
+ pub = PUBLIC_KEY
+ created_on = BLOCK_UID
+ written_on = BLOCKSTAMP
+ member = true
+ wasMember = true
+ kick = false
+ )
+
+ MINDEX (
+ op = 'CREATE'
+ pub = PUBLIC_KEY
+ created_on = BLOCK_UID
+ written_on = BLOCKSTAMP
+ expired_on = 0
+ expires_on = MedianTime + msValidity
+ revokes_on = MedianTime + msValidity*2
+ chainable_on = MedianTime + msPeriod
+ type = 'JOIN'
+ revoked_on = null
+ leaving = false
+ )
+
+##### Joiners
+
+Each join whose `PUBLIC_KEY` **does not match** a local MINDEX `CREATE, PUBLIC_KEY` produces 2 new entries:
+
+ IINDEX (
+ op = 'UPDATE'
+ uid = null
+ pub = PUBLIC_KEY
+ created_on = null
+ written_on = BLOCKSTAMP
+ member = true
+ wasMember = null
+ kick = null
+ )
+
+ MINDEX (
+ op = 'UPDATE'
+ pub = PUBLIC_KEY
+ created_on = BLOCK_UID
+ written_on = BLOCKSTAMP
+ expired_on = 0
+ expires_on = MedianTime + msValidity
+ revokes_on = MedianTime + msValidity*2
+ chainable_on = MedianTime + msPeriod
+ type = 'JOIN'
+ revoked_on = null
+ leaving = null
+ )
+
+##### Actives
+
+Each active produces 1 new entry:
+
+ MINDEX (
+ op = 'UPDATE'
+ pub = PUBLIC_KEY
+ created_on = BLOCK_UID
+ written_on = BLOCKSTAMP
+ expires_on = MedianTime + msValidity
+ revokes_on = MedianTime + msValidity*2
+ chainable_on = MedianTime + msPeriod
+ type = 'RENEW'
+ revoked_on = null
+ leaving = null
+ )
+
+##### Leavers
+
+Each leaver produces 1 new entry:
+
+ MINDEX (
+ op = 'UPDATE'
+ pub = PUBLIC_KEY
+ created_on = BLOCK_UID
+ written_on = BLOCKSTAMP
+ type = 'LEAVE'
+ expires_on = null
+ revokes_on = null
+ revoked_on = null
+ leaving = true
+ )
+
+##### Revoked
+
+Each revocation produces 1 new entry:
+
+ MINDEX (
+ op = 'UPDATE'
+ pub = PUBLIC_KEY
+ created_on = BLOCK_UID
+ written_on = BLOCKSTAMP
+ type = 'REV'
+ expires_on = null
+ revokes_on = null
+ revoked_on = MedianTime
+ revocation = REVOCATION_SIG
+ leaving = false
+ )
+
+##### Excluded
+
+Each exclusion produces 1 new entry:
+
+ IINDEX (
+ op = 'UPDATE'
+ uid = null
+ pub = PUBLIC_KEY
+ created_on = null
+ written_on = BLOCKSTAMP
+ member = false
+ wasMember = null
+ kick = false
+ )
+
+##### Certifications
+
+Each certification produces 1 new entry:
+
+ CINDEX (
+ op = 'CREATE'
+ issuer = PUBKEY_FROM
+ receiver = PUBKEY_TO
+ created_on = BLOCK_ID
+ written_on = BLOCKSTAMP
+ sig = SIGNATURE
+ expires_on = MedianTime + sigValidity
+ chainable_on = MedianTime + sigPeriod
+ replayable_on = MedianTime + sigReplay
+ expired_on = 0
+ )
+
+##### Sources
+
+Each transaction input produces 1 new entry:
+
+ SINDEX (
+ op = 'UPDATE'
+ tx = TRANSACTION_HASH
+ identifier = INPUT_IDENTIFIER
+ pos = INPUT_INDEX
+ created_on = TX_BLOCKSTAMP
+ written_on = BLOCKSTAMP
+ amount = INPUT_AMOUNT
+ base = INPUT_BASE
+ conditions = null
+ consumed = true
+ )
+
+Each transaction output produces 1 new entry:
+
+ SINDEX (
+ op = 'CREATE'
+ tx = TRANSACTION_HASH
+ identifier = TRANSACTION_HASH
+ pos = OUTPUT_INDEX_IN_TRANSACTION
+ written_on = BLOCKSTAMP
+ written_time = MedianTime
+ amount = OUTPUT_AMOUNT
+ base = OUTPUT_BASE
+ locktime = LOCKTIME
+ conditions = OUTPUT_CONDITIONS
+ consumed = false
+ )
+
+##### INDEX RULES
+
+###### UserID and PublicKey unicity
+
+* The local IINDEX has a unicity constraint on `USER_ID`.
+* The local IINDEX has a unicity constraint on `PUBLIC_KEY`.
+* Each local IINDEX `op = 'CREATE'` operation must match a single local MINDEX `op = 'CREATE', pub = PUBLIC_KEY` operation.
+
+> Functionally: UserID and public key must be unique in a block, an each new identity must have an opt-in document attached.
+
+###### Membership unicity
+
+* The local MINDEX has a unicity constraint on `PUBLIC_KEY`
+
+> Functionally: a user has only 1 status change allowed per block.
+
+###### Revocation implies exclusion
+
+* Each local MINDEX ̀`op = 'UPDATE', revoked_on != null` operations must match a single local IINDEX `op = 'UPDATE', pub = PUBLIC_KEY, member = false` operation.
+
+> Functionally: a revoked member must be immediately excluded.
+
+###### Certifications
+
+* The local CINDEX has a unicity constraint on `PUBKEY_FROM, PUBKEY_TO`
+* The local CINDEX has a unicity constraint on `PUBKEY_FROM`, except for block#0
+* The local CINDEX must not match a MINDEX operation on `PUBLIC_KEY = PUBKEY_FROM, member = false` or `PUBLIC_KEY = PUBKEY_FROM, leaving = true`
+
+> Functionally:
+>
+> * a block cannot have 2 identical certifications (A -> B)
+> * a block cannot have 2 certifications from a same public key, except in block#0
+> * a block cannot have a certification to a leaver or an excluded
+
+###### Sources
+
+* The local SINDEX has a unicity constraint on `UPDATE, IDENTIFIER, POS`
+* The local SINDEX has a unicity constraint on `CREATE, IDENTIFIER, POS`
+
+> Functionally:
+> * a same source cannot be consumed twice by the block
+> * a same output cannot be produced twice by block
+>
+> But a source can be both created and consumed in the same block, so a *chain of transactions* can be stored at once.
+
+##### Double-spending control
+
+Definitions:
+
+For each SINDEX unique `tx`:
+
+* **inputs** are the SINDEX row matching `UPDATE, tx`
+* **outputs** are the SINDEX row matching `CREATE, tx`
+
+> Functionally: we gather the sources for each transaction, in order to check them.
+
+###### CommonBase
+
+Each input has an `InputBase`, and each output has an `OutputBase`. These bases are to be called `AmountBase`.
+
+The `CommonBase` is the lowest base value among all `AmountBase` of the transaction.
+
+For any amount comparison, the respective amounts must be translated into `CommonBase` using the following rule:
+
+```
+AMOUNT(CommonBase) = AMOUNT(AmountBase) x POW(10, AmountBase - CommonBase)
+```
+
+So if a transaction only carries amounts with the same `AmountBase`, no conversion is required. But if a transaction carries:
+
+* input_0 of value 45 with `AmountBase = 5`
+* input_1 of value 75 with `AmountBase = 5`
+* input_2 of value 3 with `AmountBase = 6`
+* output_0 of value 15 with `AmountBase = 6`
+
+Then the output value has to be converted before being compared:
+
+```
+CommonBase = 5
+
+output_0(5) = output_0(6) x POW(10, 6 - 5)
+output_0(5) = output_0(6) x POW(10, 1)
+output_0(5) = output_0(6) x 10
+output_0(5) = 15 x 10
+output_0(5) = 150
+
+input_0(5) = input_0(5)
+input_0(5) = 45
+
+input_1(5) = input_1(5)
+input_1(5) = 75
+
+input_2(5) = input_2(6) x POW(10, 6 - 5)
+input_2(5) = input_2(6) x POW(10, 1)
+input_2(5) = input_2(6) x 10
+input_2(5) = 3 x 10
+input_2(5) = 30
+```
+
+The equality of inputs and outputs is then verified because:
+
+```
+output_0(5) = 150
+input_0(5) = 45
+input_1(5) = 75
+input_2(5) = 30
+
+output_0(5) = input_0(5) + input_1(5) + input_2(5)
+150 = 45 + 75 + 30
+TRUE
+```
+
+###### Amounts
+
+* *Def.*: `InputBaseSum` is the sum of amounts with the same `InputBase`.
+* *Def.*: `OutputBaseSum` is the sum of amounts with the same `OutputBase`.
+* *Def.*: `BaseDelta = OutputBaseSum - InputBaseSum`, expressed in `CommonBase`
+* *Rule*: For each `OutputBase`:
+ * if `BaseDelta > 0`, then it must be inferior or equal to the sum of all preceding `BaseDelta`
+* *Rule*: The sum of all inputs in `CommonBase` must equal the sum of all outputs in `CommonBase`
+
+> Functionally: we cannot create nor lose money through transactions. We can only transfer coins we own.
+> Functionally: also, we cannot convert a superiod unit base into a lower one.
+
+##### Transactions chaining max depth
+
+ FUNCTION `getTransactionDepth(txHash, LOCAL_DEPTH)`:
+
+ INPUTS = LOCAL_SINDEX[op='UPDATE',tx=txHash]
+ DEPTH = LOCAL_DEPTH
+
+ FOR EACH `INPUT` OF `INPUTS`
+ CONSUMED = LOCAL_SINDEX[op='CREATE',identifier=INPUT.identifier,pos=INPUT.pos]
+ IF (CONSUMED != NULL)
+ IF (LOCAL_DEPTH < 5)
+ DEPTH = MAX(DEPTH, getTransactionDepth(CONSUMED.tx, LOCAL_DEPTH +1)
+ ELSE
+ DEPTH++
+ END_IF
+ END_IF
+ END_FOR
+
+ RETURN DEPTH
+
+ END_FUNCTION
+
+Then:
+
+ maxTxChainingDepth = 0
+
+For each `TX_HASH` of `UNIQ(PICK(LOCAL_SINDEX, 'tx))`:
+
+ maxTxChainingDepth = MAX(maxTxChainingDepth, getTransactionDepth(TX_HASH, 0))
+
+Rule:
+
+ maxTxChainingDepth <= 5
+
+#### Global
+
+Global validation verifies the coherence of a locally-validated block, in the context of the whole blockchain, including the block.
+
+##### INDEX GENERATION
+
+###### Definitions
+
+Here are some references that will be used in next sections.
+
+BINDEX references:
+
+* *HEAD*: the BINDEX top entry (generated for incoming block, precisely)
+* *HEAD~1*: the BINDEX 1<sup>st</sup> entry before HEAD (= entry where `ENTRY.number = HEAD.number - 1`)
+* *HEAD~n*: the BINDEX n<sup>th</sup> entry before HEAD (= entry where `ENTRY.number = HEAD.number - n`)
+* *HEAD~n[field=value, ...]*: the BINDEX entry at *HEAD~n* if it fulfills the condition, null otherwise
+* *HEAD~n..m[field=value, ...]*: the BINDEX entries between *HEAD~n* and *HEAD~m*, included, where each entry fulfills the condition
+* *HEAD~n.property*: get a BINDEX entry property. Ex.: `HEAD~1.hash` looks at the hash of the entry preceding HEAD.
+* *(HEAD~n..m).property*: get all the values of *property* in BINDEX for entries between *HEAD~n* and *HEAD~m*, included.
+* *(HEAD~<n>..<m>).property*: same, but <n> and <m> are variables to be computed
+
+Function references:
+
+* *COUNT* returns the number of values in a list of values
+* *AVG* computes the average value in a list of values, floor rounded.
+* *MEDIAN* computes the median value in a list of values
+* *MAX* computes the maximum value in a list of values
+
+> If values count is even, the median is computed over the 2 centered values by an arithmetical median on them, *NOT* rounded.
+
+* *UNIQ* returns a list of the unique values in a list of values
+* *PICK* returns a list of the values by picking a particular property on each record
+* *INTEGER_PART* return the integer part of a number
+* *FIRST* return the first element in a list of values matching the given condition
+* *REDUCE* merges a set of elements into a single one, by extending the non-null properties from each record into the resulting record.
+* *REDUCE_BY* merges a set of elements into a new set, where each new element is the reduction of the first set sharing a given key.
+* *CONCAT* concatenates two sets of elements into a new one
+
+> If there is no elements, all its properties are `null`.
+
+* *NUMBER* get the number part of blockstamp
+* *HASH* get the hash part of blockstamp
+
+###### HEAD
+
+The block produces 1 new entry:
+
+ BINDEX (
+ version = Version
+ size = BlockSize
+ hash = BlockHash
+ issuer = Issuer
+ time = Time
+ number = null
+ currency = null
+ previousHash = null
+ previousIssuer = null
+ membersCount = null
+ issuersCount = null
+ issuersFrame = null
+ issuersFrameVar = null
+ issuerDiff = null
+ avgBlockSize = null
+ medianTime = null
+ dividend = null
+ mass = null
+ massReeval = null
+ unitBase = null
+ powMin = PowMin
+ udTime = null
+ diffTime = null
+ speed = null
+ )
+
+This entry will be refered to as *HEAD* in the following sections, and is added on the top of the BINDEX.
+
+###### BR_G01 - HEAD.number
+
+If HEAD~1 is defined:
+
+ HEAD.number = HEAD~1.number + 1
+
+Else:
+
+ HEAD.number = 0
+
+###### BR_G02 - HEAD.previousHash
+
+If `HEAD.number > 0`:
+
+ HEAD.previousHash = HEAD~1.hash
+
+Else:
+
+ HEAD.previousHash = null
+
+###### BR_G99 - HEAD.currency
+
+If `HEAD.number > 0`:
+
+ HEAD.currency = HEAD~1.currency
+
+Else:
+
+ HEAD.currency = null
+
+###### BR_G03 - HEAD.previousIssuer
+
+If `HEAD.number > 0`:
+
+ HEAD.previousIssuer = HEAD~1.issuer
+
+Else:
+
+ HEAD.previousIssuer = null
+
+###### BR_G100 - HEAD.issuerIsMember
+
+If `HEAD.number > 0`:
+
+ HEAD.issuerIsMember = REDUCE(GLOBAL_IINDEX[pub=HEAD.issuer]).member
+
+Else:
+
+ HEAD.issuerIsMember = REDUCE(LOCAL_IINDEX[pub=HEAD.issuer]).member
+
+###### BR_G04 - HEAD.issuersCount
+
+If `HEAD.number == 0`:
+
+ HEAD.issuersCount = 0
+
+Else:
+
+ HEAD.issuersCount = COUNT(UNIQ((HEAD~1..<HEAD~1.issuersFrame>).issuer))
+
+###### BR_G05 - HEAD.issuersFrame
+
+If `HEAD.number == 0`:
+
+ HEAD.issuersFrame = 1
+
+Else if `HEAD~1.issuersFrameVar > 0`:
+
+ HEAD.issuersFrame = HEAD~1.issuersFrame + 1
+
+Else if `HEAD~1.issuersFrameVar < 0`:
+
+ HEAD.issuersFrame = HEAD~1.issuersFrame - 1
+
+Else:
+
+ HEAD.issuersFrame = HEAD~1.issuersFrame
+
+###### BR_G06 - HEAD.issuersFrameVar
+
+If `HEAD.number == 0`:
+
+ HEAD.issuersFrameVar = 0
+
+Else if `HEAD~1.issuersFrameVar > 0`:
+
+ HEAD.issuersFrameVar = HEAD~1.issuersFrameVar + 5*(HEAD.issuersCount - HEAD~1.issuersCount) - 1
+
+Else if `HEAD~1.issuersFrameVar < 0`:
+
+ HEAD.issuersFrameVar = HEAD~1.issuersFrameVar + 5*(HEAD.issuersCount - HEAD~1.issuersCount) + 1
+
+Else:
+
+ HEAD.issuersFrameVar = HEAD~1.issuersFrameVar + 5*(HEAD.issuersCount - HEAD~1.issuersCount)
+
+
+###### BR_G07 - HEAD.avgBlockSize
+
+ HEAD.avgBlockSize = AVG((HEAD~1..<HEAD.issuersCount>).size)
+
+###### BR_G08 - HEAD.medianTime
+
+If `HEAD.number > 0`:
+
+ HEAD.medianTime = MEDIAN((HEAD~1..<MIN(medianTimeBlocks, HEAD.number)>).time)
+
+Else:
+
+ HEAD.medianTime = HEAD.time
+
+###### BR_G09 - HEAD.diffNumber
+
+If `HEAD.number == 0`:
+
+ HEAD.diffNumber = HEAD.number + dtDiffEval
+
+Else if `HEAD~1.diffNumber <= HEAD.number`:
+
+ HEAD.diffNumber = HEAD~1.diffNumber + dtDiffEval
+
+Else:
+
+ HEAD.diffNumber = HEAD~1.diffNumber
+
+###### BR_G10 - HEAD.membersCount
+
+If `HEAD.number == 0`:
+
+ HEAD.membersCount = COUNT(LOCAL_IINDEX[member=true])
+
+Else:
+
+ HEAD.membersCount = HEAD~1.membersCount + COUNT(LOCAL_IINDEX[member=true]) - COUNT(LOCAL_IINDEX[member=false])
+
+###### BR_G11 - HEAD.udTime and HEAD.udReevalTime
+
+If `HEAD.number == 0`:
+
+ HEAD.udTime = udTime0
+
+Else if `HEAD~1.udTime <= HEAD.medianTime`:
+
+ HEAD.udTime = HEAD~1.udTime + dt
+
+Else:
+
+ HEAD.udTime = HEAD~1.udTime
+
+EndIf
+
+If `HEAD.number == 0`:
+
+ HEAD.udReevalTime = udReevalTime0
+
+Else if `HEAD~1.udReevalTime <= HEAD.medianTime`:
+
+ HEAD.udReevalTime = HEAD~1.udReevalTime + dtReeval
+
+Else:
+
+ HEAD.udReevalTime = HEAD~1.udReevalTime
+
+EndIf
+
+###### BR_G12 - HEAD.unitBase
+
+If `HEAD.number == 0`:
+
+ HEAD.unitBase = 0
+
+Else:
+
+ HEAD.unitBase = HEAD~1.unitBase
+
+###### BR_G13 - HEAD.dividend and HEAD.new_dividend
+
+If `HEAD.number == 0`:
+
+ HEAD.dividend = ud0
+
+Else If `HEAD.udReevalTime != HEAD~1.udReevalTime`:
+
+ HEAD.dividend = CEIL(HEAD_1.dividend + c² * CEIL(HEAD~1.massReeval / POW(10, HEAD~1.unitbase)) / HEAD.membersCount)
+
+Else:
+
+ HEAD.dividend = HEAD~1.dividend
+
+EndIf
+
+If `HEAD.number == 0`:
+
+ HEAD.new_dividend = null
+
+Else If `HEAD.udTime != HEAD~1.udTime`:
+
+ HEAD.new_dividend = HEAD.dividend
+
+Else:
+
+ HEAD.new_dividend = null
+
+###### BR_G14 - HEAD.dividend and HEAD.unitbase and HEAD.new_dividend
+
+If `HEAD.dividend >= 1000000` :
+
+ HEAD.dividend = CEIL(HEAD.dividend / 10)
+ HEAD.new_dividend = HEAD.dividend
+ HEAD.unitBase = HEAD.unitBase + 1
+
+###### BR_G15 - HEAD.mass and HEAD.massReeval
+
+If `HEAD.number == 0`:
+
+ HEAD.mass = 0
+
+Else if `HEAD.udTime != HEAD~1.udTime`:
+
+ HEAD.mass = HEAD~1.mass + HEAD.dividend * POWER(10, HEAD.unitBase) * HEAD.membersCount
+
+Else:
+
+ HEAD.mass = HEAD~1.mass
+
+EndIf
+
+If `HEAD.number == 0`:
+
+ HEAD.massReeval = 0
+
+Else if `HEAD.udReevalTime != HEAD~1.udReevalTime`:
+
+ HEAD.massReeval = HEAD~1.mass
+
+Else:
+
+ HEAD.massReeval = HEAD~1.massReeval
+
+EndIf
+
+> Functionnally: the UD is reevaluated on the preceding monetary mass (important!)
+
+###### BR_G16 - HEAD.speed
+
+If `HEAD.number == 0`:
+
+ speed = 0
+
+Else:
+
+ range = MIN(dtDiffEval, HEAD.number)
+ elapsed = (HEAD.medianTime - HEAD~<range>.medianTime)
+
+EndIf
+
+If `elapsed == 0`:
+
+ speed = 100
+
+Else:
+ speed = range / elapsed
+
+###### BR_G17 - HEAD.powMin
+
+If `HEAD.number > 0 AND HEAD.diffNumber != HEAD~1.diffNumber AND HEAD.speed >= maxSpeed AND (HEAD~1.powMin + 2) % 16 == 0`:
+
+ HEAD.powMin = HEAD~1.powMin + 2
+
+Else if `HEAD.number > 0 AND HEAD.diffNumber != HEAD~1.diffNumber AND HEAD.speed >= maxSpeed`:
+
+ HEAD.powMin = HEAD~1.powMin + 1
+
+Else if `HEAD.number > 0 AND HEAD.diffNumber != HEAD~1.diffNumber AND HEAD.speed <= minSpeed AND (HEAD~1.powMin) % 16 == 0`:
+
+ HEAD.powMin = MAX(0, HEAD~1.powMin - 2)
+
+Else if `HEAD.number > 0 AND HEAD.diffNumber != HEAD~1.diffNumber AND HEAD.speed <= minSpeed`:
+
+ HEAD.powMin = MAX(0, HEAD~1.powMin - 1)
+
+Else if `HEAD.number > 0`:
+
+ HEAD.powMin = HEAD~1.powMin
+
+###### BR_G18 - HEAD.powZeros and HEAD.powRemainder
+
+If `HEAD.number == 0`:
+
+ nbPersonalBlocksInFrame = 0
+ medianOfBlocksInFrame = 1
+
+Else:
+
+ blocksOfIssuer = HEAD~1..<HEAD~1.issuersFrame>[issuer=HEAD.issuer]
+ nbPersonalBlocksInFrame = COUNT(blocksOfIssuer)
+ blocksPerIssuerInFrame = MAP(
+ UNIQ((HEAD~1..<HEAD~1.issuersFrame>).issuer)
+ => ISSUER: COUNT(HEAD~1..<HEAD~1.issuersFrame>[issuer=ISSUER]))
+ medianOfBlocksInFrame = MEDIAN(blocksPerIssuerInFrame)
+
+EndIf
+
+If `nbPersonalBlocksInFrame == 0`:
+
+ nbPreviousIssuers = 0
+ nbBlocksSince = 0
+
+Else:
+
+ last = FIRST(blocksOfIssuer)
+ nbPreviousIssuers = last.issuersCount
+ nbBlocksSince = HEAD~1.number - last.number
+
+EndIf
+
+ PERSONAL_EXCESS = MAX(0, ( (nbPersonalBlocksInFrame + 1) / medianOfBlocksInFrame) - 1)
+ PERSONAL_HANDICAP = FLOOR(LN(1 + PERSONAL_EXCESS) / LN(1.189))
+ HEAD.issuerDiff = MAX [ HEAD.powMin ; HEAD.powMin * FLOOR (percentRot * nbPreviousIssuers / (1 + nbBlocksSince)) ] + PERSONAL_HANDICAP
+
+If `(HEAD.issuerDiff + 1) % 16 == 0`:
+
+ HEAD.issuerDiff = HEAD.issuerDiff + 1
+
+EndIf
+
+Finally:
+
+ HEAD.powRemainder = HEAD.issuerDiff % 16
+ HEAD.powZeros = (HEAD.issuerDiff - HEAD.powRemainder) / 16
+
+###### Local IINDEX augmentation
+
+####### BR_G19 - ENTRY.age
+
+For each ENTRY in local IINDEX where `op = 'CREATE'`:
+
+ REF_BLOCK = HEAD~<HEAD~1.number + 1 - NUMBER(ENTRY.created_on)>[hash=HASH(ENTRY.created_on)]
+
+If `HEAD.number == 0 && ENTRY.created_on == '0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855'`:
+
+ ENTRY.age = 0
+
+Else if `REF_BLOC != null`:
+
+ ENTRY.age = HEAD~1.medianTime - REF_BLOCK.medianTime
+
+Else:
+
+ ENTRY.age = conf.idtyWindow + 1
+
+EndIf
+
+###### BR_G20 - Identity UserID unicity
+
+For each ENTRY in local IINDEX:
+
+If `op = 'CREATE'`:
+
+ ENTRY.uidUnique = COUNT(GLOBAL_IINDEX[uid=ENTRY.uid) == 0
+
+Else:
+
+ ENTRY.uidUnique = true
+
+###### BR_G21 - Identity pubkey unicity
+
+For each ENTRY in local IINDEX:
+
+If `op = 'CREATE'`:
+
+ ENTRY.pubUnique = COUNT(GLOBAL_IINDEX[pub=ENTRY.pub) == 0
+
+Else:
+
+ ENTRY.pubUnique = true
+
+####### BR_G33 - ENTRY.excludedIsMember
+
+For each ENTRY in local IINDEX where `member != false`:
+
+ ENTRY.excludedIsMember = true
+
+For each ENTRY in local IINDEX where `member == false`:
+
+ ENTRY.excludedIsMember = REDUCE(GLOBAL_IINDEX[pub=ENTRY.pub]).member
+
+####### BR_G35 - ENTRY.isBeingKicked
+
+For each ENTRY in local IINDEX where `member != false`:
+
+ ENTRY.isBeingKicked = false
+
+For each ENTRY in local IINDEX where `member == false`:
+
+ ENTRY.isBeingKicked = true
+
+####### BR_G36 - ENTRY.hasToBeExcluded
+
+For each ENTRY in local IINDEX:
+
+ ENTRY.hasToBeExcluded = REDUCE(GLOBAL_IINDEX[pub=ENTRY.pub]).kick
+
+###### Local MINDEX augmentation
+
+####### BR_G22 - ENTRY.age
+
+For each ENTRY in local MINDEX where `revoked_on == null`:
+
+ REF_BLOCK = HEAD~<HEAD~1.number + 1 - NUMBER(ENTRY.created_on)>[hash=HASH(ENTRY.created_on)]
+
+If `HEAD.number == 0 && ENTRY.created_on == '0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855'`:
+
+ ENTRY.age = 0
+
+Else if `REF_BLOC != null`:
+
+ ENTRY.age = HEAD~1.medianTime - REF_BLOCK.medianTime
+
+Else:
+
+ ENTRY.age = conf.msWindow + 1
+
+EndIf
+
+####### BR_G23 - ENTRY.numberFollowing
+
+For each ENTRY in local MINDEX where `revoked_on == null`:
+
+ created_on = REDUCE(GLOBAL_MINDEX[pub=ENTRY.pub]).created_on
+
+If `created_on != null`:
+
+ ENTRY.numberFollowing = NUMBER(ENTRY.created_ON) > NUMBER(created_on)
+
+Else:
+
+ ENTRY.numberFollowing = true
+
+EndIf
+
+For each ENTRY in local MINDEX where `revoked_on != null`:
+
+ ENTRY.numberFollowing = true
+
+####### BR_G24 - ENTRY.distanceOK
+
+For each ENTRY in local MINDEX where `type == 'JOIN' OR type == 'ACTIVE'`:
+
+ dSen = CEIL(HEAD.membersCount ^ (1 / stepMax))
+
+ GRAPH = SET(LOCAL_CINDEX, 'issuer', 'receiver') + SET(GLOBAL_CINDEX, 'issuer', 'receiver')
+ SENTRIES = SUBSET(GRAPH, dSen, 'issuer')
+
+ ENTRY.distanceOK = EXISTS_PATH(xpercent, SENTRIES, GRAPH, ENTRY.pub, stepMax)
+
+> Functionally: checks if it exists, for at least `xpercent`% of the sentries, a path using GLOBAL_CINDEX + LOCAL_CINDEX leading to the key `PUBLIC_KEY` with a maximum count of `[stepMax]` hops.
+
+For each ENTRY in local MINDEX where `!(type == 'JOIN' OR type == 'ACTIVE')`:
+
+ ENTRY.distanceOK = true
+
+####### BR_G25 - ENTRY.onRevoked
+
+For each ENTRY in local MINDEX:
+
+ ENTRY.onRevoked = REDUCE(GLOBAL_MINDEX[pub=ENTRY.pub]).revoked_on != null
+
+####### BR_G26 - ENTRY.joinsTwice
+
+For each ENTRY in local MINDEX where `op = 'UPDATE', expired_on = 0`:
+
+ ENTRY.joinsTwice = REDUCE(GLOBAL_IINDEX[pub=ENTRY.pub]).member == true
+
+> This rule ensures that someone who is in the `Joiners` field isn't already a member.
+
+####### BR_G27 - ENTRY.enoughCerts
+
+For each ENTRY in local MINDEX where `type == 'JOIN' OR type == 'ACTIVE'`:
+
+ ENTRY.enoughCerts = COUNT(GLOBAL_CINDEX[receiver=ENTRY.pub,expired_on=null]) + COUNT(LOCAL_CINDEX[receiver=ENTRY.pub,expired_on=null]) >= sigQty
+
+> Functionally: any member or newcomer needs `[sigQty]` certifications coming *to* him to be in the WoT
+
+For each ENTRY in local MINDEX where `!(type == 'JOIN' OR type == 'ACTIVE')`:
+
+ ENTRY.enoughCerts = true
+
+####### BR_G28 - ENTRY.leaverIsMember
+
+For each ENTRY in local MINDEX where `type == 'LEAVE'`:
+
+ ENTRY.leaverIsMember = REDUCE(GLOBAL_IINDEX[pub=ENTRY.pub]).member
+
+For each ENTRY in local MINDEX where `type != 'LEAVE'`:
+
+ ENTRY.leaverIsMember = true
+
+####### BR_G29 - ENTRY.activeIsMember
+
+For each ENTRY in local MINDEX where `type == 'ACTIVE'`:
+
+ ENTRY.activeIsMember = REDUCE(GLOBAL_IINDEX[pub=ENTRY.pub]).member
+
+For each ENTRY in local MINDEX where `type != 'ACTIVE'`:
+
+ ENTRY.activeIsMember = true
+
+####### BR_G30 - ENTRY.revokedIsMember
+
+For each ENTRY in local MINDEX where `revoked_on == null`:
+
+ ENTRY.revokedIsMember = true
+
+For each ENTRY in local MINDEX where `revoked_on != null`:
+
+ ENTRY.revokedIsMember = REDUCE(GLOBAL_IINDEX[pub=ENTRY.pub]).member
+
+####### BR_G31 - ENTRY.alreadyRevoked
+
+For each ENTRY in local MINDEX where `revoked_on == null`:
+
+ ENTRY.alreadyRevoked = false
+
+For each ENTRY in local MINDEX where `revoked_on != null`:
+
+ ENTRY.alreadyRevoked = REDUCE(GLOBAL_MINDEX[pub=ENTRY.pub]).revoked_on != null
+
+####### BR_G32 - ENTRY.revocationSigOK
+
+For each ENTRY in local MINDEX where `revoked_on == null`:
+
+ ENTRY.revocationSigOK = true
+
+For each ENTRY in local MINDEX where `revoked_on != null`:
+
+ ENTRY.revocationSigOK = SIG_CHECK_REVOKE(REDUCE(GLOBAL_IINDEX[pub=ENTRY.pub]), ENTRY)
+
+####### BR_G34 - ENTRY.isBeingRevoked
+
+For each ENTRY in local MINDEX where `revoked_on == null`:
+
+ ENTRY.isBeingRevoked = false
+
+For each ENTRY in local MINDEX where `revoked_on != null`:
+
+ ENTRY.isBeingRevoked = true
+
+####### BR_G107 - ENTRY.unchainables
+
+If `HEAD.number > 0 AND ENTRY.revocation == null`:
+
+ ENTRY.unchainables = COUNT(GLOBAL_MINDEX[issuer=ENTRY.issuer, chainable_on > HEAD~1.medianTime]))
+
+###### Local CINDEX augmentation
+
+For each ENTRY in local CINDEX:
+
+####### BR_G37 - ENTRY.age
+
+ REF_BLOCK = HEAD~<HEAD~1.number + 1 - NUMBER(ENTRY.created_on)>[hash=HASH(ENTRY.created_on)]
+
+If `HEAD.number == 0 && ENTRY.created_on == '0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855'`:
+
+ ENTRY.age = 0
+
+Else if `REF_BLOC != null`:
+
+ ENTRY.age = HEAD~1.medianTime - REF_BLOCK.medianTime
+
+Else:
+
+ ENTRY.age = conf.sigWindow + 1
+
+EndIf
+
+####### BR_G38 - ENTRY.unchainables
+
+If `HEAD.number > 0`:
+
+ ENTRY.unchainables = COUNT(GLOBAL_CINDEX[issuer=ENTRY.issuer, chainable_on > HEAD~1.medianTime]))
+
+####### BR_G39 - ENTRY.stock
+
+ ENTRY.stock = COUNT(REDUCE_BY(GLOBAL_CINDEX[issuer=ENTRY.issuer], 'receiver', 'created_on')[expired_on=0])
+
+####### BR_G40 - ENTRY.fromMember
+
+ ENTRY.fromMember = REDUCE(GLOBAL_IINDEX[pub=ENTRY.issuer]).member
+
+####### BR_G41 - ENTRY.toMember
+
+ ENTRY.toMember = REDUCE(GLOBAL_IINDEX[pub=ENTRY.receiver]).member
+
+####### BR_G42 - ENTRY.toNewcomer
+
+ ENTRY.toNewcomer = COUNT(LOCAL_IINDEX[member=true,pub=ENTRY.receiver]) > 0
+
+####### BR_G43 - ENTRY.toLeaver
+
+ ENTRY.toLeaver = REDUCE(GLOBAL_MINDEX[pub=ENTRY.receiver]).leaving
+
+####### BR_G44 - ENTRY.isReplay
+
+ reducable = GLOBAL_CINDEX[issuer=ENTRY.issuer,receiver=ENTRY.receiver,expired_on=0]
+
+If `count(reducable) == 0`:
+
+ ENTRY.isReplay = false
+
+Else:
+
+ ENTRY.isReplay = reduce(reducable).expired_on == 0
+
+####### BR_G44.2 - ENTRY.isReplayable
+
+If `HEAD.number > 0 && HEAD~1.version > 10` :
+
+ reducable = GLOBAL_CINDEX[issuer=ENTRY.issuer,receiver=ENTRY.receiver,expired_on=0]
+
+ If `count(reducable) == 0`:
+
+ ENTRY.isReplayable = true
+
+ Else:
+
+ ENTRY.isReplayable = reduce(reducable).replayable_on < HEAD~1.medianTime
+Else:
+
+ ENTRY.isReplayable = false
+
+EndIf
+
+####### BR_G45 - ENTRY.sigOK
+
+ ENTRY.sigOK = SIG_CHECK_CERT(REDUCE(GLOBAL_IINDEX[pub=ENTRY.receiver]), ENTRY)
+
+###### Local SINDEX augmentation
+
+####### BR_G102 - ENTRY.age
+
+For each ENTRY in local SINDEX where `op = 'UPDATE'`:
+
+ REF_BLOCK = HEAD~<HEAD~1.number + 1 - NUMBER(ENTRY.hash)>[hash=HASH(ENTRY.created_on)]
+
+If `HEAD.number == 0 && ENTRY.created_on == '0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855'`:
+
+ ENTRY.age = 0
+
+Else if `REF_BLOC != null`:
+
+ ENTRY.age = HEAD~1.medianTime - REF_BLOCK.medianTime
+
+Else:
+
+ ENTRY.age = conf.txWindow + 1
+
+EndIf
+
+####### BR_G46 - ENTRY.available and ENTRY.conditions
+
+For each `LOCAL_SINDEX[op='UPDATE'] as ENTRY`:
+
+ INPUT_ENTRIES = LOCAL_SINDEX[op='CREATE',identifier=ENTRY.identifier,pos=ENTRY.pos,amount=ENTRY.amount,base=ENTRY.base]
+ If COUNT(INPUT_ENTRIES) == 0 Then
+ INPUT_ENTRIES = GLOBAL_SINDEX[identifier=ENTRY.identifier,pos=ENTRY.pos,amount=ENTRY.amount,base=ENTRY.base]
+ EndIf
+ INPUT = REDUCE(INPUT_ENTRIES)
+ ENTRY.conditions = INPUT.conditions
+ ENTRY.available = INPUT.consumed == false
+
+####### BR_G47 - ENTRY.isLocked
+
+ INPUT_ENTRIES = LOCAL_SINDEX[op='CREATE',identifier=ENTRY.identifier,pos=ENTRY.pos,amount=ENTRY.amount,base=ENTRY.base]
+ If COUNT(INPUT_ENTRIES) == 0 Then
+ INPUT_ENTRIES = GLOBAL_SINDEX[identifier=ENTRY.identifier,pos=ENTRY.pos,amount=ENTRY.amount,base=ENTRY.base]
+ EndIf
+ INPUT = REDUCE(INPUT_ENTRIES)
+ ENTRY.isLocked = TX_SOURCE_UNLOCK(INPUT.conditions, ENTRY)
+
+####### BR_G48 - ENTRY.isTimeLocked
+
+ INPUT_ENTRIES = LOCAL_SINDEX[op='CREATE',identifier=ENTRY.identifier,pos=ENTRY.pos,amount=ENTRY.amount,base=ENTRY.base]
+ If COUNT(INPUT_ENTRIES) == 0 Then
+ INPUT_ENTRIES = GLOBAL_SINDEX[identifier=ENTRY.identifier,pos=ENTRY.pos,amount=ENTRY.amount,base=ENTRY.base]
+ EndIf
+ INPUT = REDUCE(INPUT_ENTRIES)
+ ENTRY.isTimeLocked = ENTRY.written_time - INPUT.written_time < ENTRY.locktime
+
+##### Rules
+
+Each rule returns true by default, unless **at least one test returns `false`**.
+
+###### BR_G49 - Version
+
+Rule:
+
+If `HEAD.number > 0`:
+
+ HEAD.version == (HEAD~1.version OR HEAD~1.version + 1)
+
+###### BR_G50 - Block size
+
+Rule:
+
+If `HEAD.number > 0`:
+
+ HEAD.size < MAX(500 ; CEIL(1.10 * HEAD.avgBlockSize))
+
+###### BR_G98 - Currency
+
+Rule:
+
+If `HEAD.number > 0`:
+
+ Currency = HEAD.currency
+
+###### BR_G51 - Number
+
+Rule:
+
+ Number = HEAD.number
+
+###### BR_G52 - PreviousHash
+
+Rule:
+
+ PreviousHash = HEAD.previousHash
+
+###### BR_G53 - PreviousIssuer
+
+Rule:
+
+ PreviousHash = HEAD.previousHash
+
+###### BR_G101 - Issuer
+
+Rule:
+
+ HEAD.issuerIsMember == true
+
+###### BR_G54 - DifferentIssuersCount
+
+Rule:
+
+ DifferentIssuersCount = HEAD.issuersCount
+
+###### BR_G55 - IssuersFrame
+
+Rule:
+
+ IssuersFrame = HEAD.issuersFrame
+
+###### BR_G56 - IssuersFrameVar
+
+Rule:
+
+ IssuersFrameVar = HEAD.issuersFrameVar
+
+###### BR_G57 - MedianTime
+
+Rule:
+
+ MedianTime = HEAD.medianTime
+
+###### BR_G58 - UniversalDividend
+
+Rule:
+
+ UniversalDividend = HEAD.new_dividend
+
+###### BR_G59 - UnitBase
+
+Rule:
+
+ UnitBase = HEAD.unitBase
+
+###### BR_G60 - MembersCount
+
+Rule:
+
+ MembersCount = HEAD.membersCount
+
+###### BR_G61 - PowMin
+
+Rule:
+
+If `HEAD.number > 0`:
+
+ PowMin = HEAD.powMin
+
+###### BR_G62 - Proof-of-work
+
+Rule: the proof is considered valid if:
+
+* `HEAD.hash` starts with at least `HEAD.powZeros` zeros
+* `HEAD.hash`'s `HEAD.powZeros + 1`th character is:
+ * between `[0-F]` if `HEAD.powRemainder = 0`
+ * between `[0-E]` if `HEAD.powRemainder = 1`
+ * between `[0-D]` if `HEAD.powRemainder = 2`
+ * between `[0-C]` if `HEAD.powRemainder = 3`
+ * between `[0-B]` if `HEAD.powRemainder = 4`
+ * between `[0-A]` if `HEAD.powRemainder = 5`
+ * between `[0-9]` if `HEAD.powRemainder = 6`
+ * between `[0-8]` if `HEAD.powRemainder = 7`
+ * between `[0-7]` if `HEAD.powRemainder = 8`
+ * between `[0-6]` if `HEAD.powRemainder = 9`
+ * between `[0-5]` if `HEAD.powRemainder = 10`
+ * between `[0-4]` if `HEAD.powRemainder = 11`
+ * between `[0-3]` if `HEAD.powRemainder = 12`
+ * between `[0-2]` if `HEAD.powRemainder = 13`
+ * between `[0-1]` if `HEAD.powRemainder = 14`
+
+> N.B.: it is not possible to have HEAD.powRemainder = 15
+
+###### BR_G63 - Identity writability
+
+Rule:
+
+ ENTRY.age <= [idtyWindow]
+
+###### BR_G64 - Membership writability
+
+Rule:
+
+ ENTRY.age <= [msWindow]
+
+###### BR_G108 - Membership period
+
+Rule:
+
+ ENTRY.unchainables == 0
+
+###### BR_G65 - Certification writability
+
+Rule:
+
+ ENTRY.age <= [sigWindow]
+
+###### BR_G66 - Certification stock
+
+Rule:
+
+ ENTRY.stock <= sigStock
+
+###### BR_G67 - Certification period
+
+Rule:
+
+ ENTRY.unchainables == 0
+
+###### BR_G68 - Certification from member
+
+Rule:
+
+If `HEAD.number > 0`:
+
+ ENTRY.fromMember == true
+
+###### BR_G69 - Certification to member or newcomer
+
+Rule:
+
+ ENTRY.toMember == true
+ OR
+ ENTRY.toNewcomer == true
+
+###### BR_G70 - Certification to non-leaver
+
+Rule:
+
+ ENTRY.toLeaver == false
+
+###### BR_G71 - Certification replay
+
+Rule:
+
+ ENTRY.isReplay == false || ENTRY.isReplayable == true
+
+###### BR_G72 - Certification signature
+
+Rule:
+
+ ENTRY.sigOK == true
+
+###### BR_G73 - Identity UserID unicity
+
+Rule:
+
+ ENTRY.uidUnique == true
+
+###### BR_G74 - Identity pubkey unicity
+
+Rule:
+
+ ENTRY.pubUnique == true
+
+###### BR_G75 - Membership succession
+
+Rule:
+
+ ENTRY.numberFollowing == true
+
+###### BR_G76 - Membership distance check
+
+Rule:
+
+ ENTRY.distanceOK == true
+
+###### BR_G77 - Membership on revoked
+
+Rule:
+
+ ENTRY.onRevoked == false
+
+###### BR_G78 - Membership joins twice
+
+Rule:
+
+ ENTRY.joinsTwice == false
+
+###### BR_G79 - Membership enough certifications
+
+Rule:
+
+ ENTRY.enoughCerts == true
+
+###### BR_G80 - Membership leaver
+
+Rule:
+
+ ENTRY.leaverIsMember == true
+
+###### BR_G81 - Membership active
+
+Rule:
+
+ ENTRY.activeIsMember == true
+
+###### BR_G82 - Revocation by a member
+
+Rule:
+
+ ENTRY.revokedIsMember == true
+
+###### BR_G83 - Revocation singleton
+
+Rule:
+
+ ENTRY.alreadyRevoked == false
+
+###### BR_G84 - Revocation signature
+
+Rule:
+
+ ENTRY.revocationSigOK == true
+
+###### BR_G85 - Excluded is a member
+
+Rule:
+
+ ENTRY.excludedIsMember == true
+
+###### BR_G86 - Excluded contains exclatly those to be kicked
+
+Rule:
+
+For each `REDUCE_BY(GLOBAL_IINDEX[kick=true], 'pub') as TO_KICK`:
+
+ REDUCED = REDUCE(GLOBAL_IINDEX[pub=TO_KICK.pub])
+
+If `REDUCED.kick` then:
+
+ COUNT(LOCAL_MINDEX[pub=REDUCED.pub,isBeingKicked=true]) == 1
+
+Rule:
+
+For each `IINDEX[member=false] as ENTRY`:
+
+ ENTRY.hasToBeExcluded = true
+
+###### BR_G103 - Trancation writability
+
+Rule:
+
+ ENTRY.age <= [txWindow]
+
+###### BR_G87 - Input is available
+
+For each `LOCAL_SINDEX[op='UPDATE'] as ENTRY`:
+
+Rule:
+
+ ENTRY.available == true
+
+###### BR_G88 - Input is unlocked
+
+For each `LOCAL_SINDEX[op='UPDATE'] as ENTRY`:
+
+Rule:
+
+ ENTRY.isLocked == false
+
+###### BR_G89 - Input is time unlocked
+
+For each `LOCAL_SINDEX[op='UPDATE'] as ENTRY`:
+
+Rule:
+
+ ENTRY.isTimeLocked == false
+
+###### BR_G90 - Output base
+
+For each `LOCAL_SINDEX[op='CREATE'] as ENTRY`:
+
+Rule:
+
+ ENTRY.unitBase <= HEAD~1.unitBase
+
+##### Post-rules INDEX augmentation
+
+###### BR_G91 - Dividend
+
+If `HEAD.new_dividend != null`:
+
+For each `REDUCE_BY(GLOBAL_IINDEX[member=true], 'pub') as IDTY` then if `IDTY.member`, add a new LOCAL_SINDEX entry:
+
+ SINDEX (
+ op = 'CREATE'
+ identifier = IDTY.pub
+ pos = HEAD.number
+ written_on = BLOCKSTAMP
+ written_time = MedianTime
+ amount = HEAD.dividend
+ base = HEAD.unitBase
+ locktime = null
+ conditions = REQUIRE_SIG(MEMBER.pub)
+ consumed = false
+ )
+
+For each `LOCAL_IINDEX[member=true] as IDTY` add a new LOCAL_SINDEX entry:
+
+ SINDEX (
+ op = 'CREATE'
+ identifier = IDTY.pub
+ pos = HEAD.number
+ written_on = BLOCKSTAMP
+ written_time = MedianTime
+ amount = HEAD.dividend
+ base = HEAD.unitBase
+ locktime = null
+ conditions = REQUIRE_SIG(MEMBER.pub)
+ consumed = false
+ )
+
+###### BR_G106 - Low accounts
+
+Set:
+
+ ACCOUNTS = UNIQ(GLOBAL_SINDEX, 'conditions')
+
+For each `ACCOUNTS as ACCOUNT` then:
+
+Set:
+
+ ALL_SOURCES = CONCAT(GLOBAL_SINDEX[conditions=ACCOUNT.conditions], LOCAL_SINDEX[conditions=ACCOUNT.conditions])
+ SOURCES = REDUCE_BY(ALL_SOURCES, 'identifier', 'pos')[consumed=false]
+ BALANCE = SUM(MAP(SOURCES => SRC: SRC.amount * POW(10, SRC.base)))
+
+If `BALANCE < 100 * POW(10, HEAD.unitBase)`, then for each `SOURCES AS SRC` add a new LOCAL_SINDEX entry:
+
+ SINDEX (
+ op = 'UPDATE'
+ identifier = SRC.identifier
+ pos = SRC.pos
+ written_on = BLOCKSTAMP
+ written_time = MedianTime
+ consumed = true
+ )
+
+###### BR_G92 - Certification expiry
+
+For each `GLOBAL_CINDEX[expires_on<=HEAD.medianTime] as CERT`, add a new LOCAL_CINDEX entry:
+
+If `reduce(GLOBAL_CINDEX[issuer=CERT.issuer,receiver=CERT.receiver,created_on=CERT.created_on]).expired_on == 0`:
+
+ CINDEX (
+ op = 'UPDATE'
+ issuer = CERT.issuer
+ receiver = CERT.receiver
+ created_on = CERT.created_on
+ expired_on = HEAD.medianTime
+ )
+
+###### BR_G93 - Membership expiry
+
+For each `REDUCE_BY(GLOBAL_MINDEX[expires_on<=HEAD.medianTime AND revokes_on>HEAD.medianTime], 'pub') as POTENTIAL` then consider `REDUCE(GLOBAL_MINDEX[pub=POTENTIAL.pub]) AS MS`.
+
+If `(MS.expired_on == null OR MS.expired_on == 0) AND MS.expires_on > HEAD.medianTime`, add a new LOCAL_MINDEX entry:
+
+ MINDEX (
+ op = 'UPDATE'
+ pub = MS.pub
+ written_on = BLOCKSTAMP
+ expired_on = HEAD.medianTime
+ )
+
+###### BR_G94 - Exclusion by membership
+
+For each `LOCAL_MINDEX[expired_on!=0] as MS`, add a new LOCAL_IINDEX entry:
+
+ IINDEX (
+ op = 'UPDATE'
+ pub = MS.pub
+ written_on = BLOCKSTAMP
+ kick = true
+ )
+
+###### BR_G95 - Exclusion by certification
+
+For each `LOCAL_CINDEX[expired_on!=0] as CERT`:
+
+Set:
+
+ CURRENT_VALID_CERTS = REDUCE_BY(GLOBAL_CINDEX[receiver=CERT.receiver], 'issuer', 'receiver', 'created_on')[expired_on=0]
+
+If `COUNT(CURRENT_VALID_CERTS) + COUNT(LOCAL_CINDEX[receiver=CERT.receiver,expired_on=0]) - COUNT(LOCAL_CINDEX[receiver=CERT.receiver,expired_on!=0]) < sigQty`, add a new LOCAL_IINDEX entry:
+
+ IINDEX (
+ op = 'UPDATE'
+ pub = CERT.receiver
+ written_on = BLOCKSTAMP
+ kick = true
+ )
+
+###### BR_G96 - Implicit revocation
+
+For each `GLOBAL_MINDEX[revokes_on<=HEAD.medianTime,revoked_on=null] as MS`:
+
+ REDUCED = REDUCE(GLOBAL_MINDEX[pub=MS.pub])
+
+If `REDUCED.revokes_on<=HEAD.medianTime AND REDUCED.revoked_on==null`, add a new LOCAL_MINDEX entry:
+
+ MINDEX (
+ op = 'UPDATE'
+ pub = MS.pub
+ written_on = BLOCKSTAMP
+ revoked_on = HEAD.medianTime
+ )
+
+###### BR_G104 - Membership expiry date correction
+
+For each `LOCAL_MINDEX[type='JOIN'] as MS`:
+
+ MS.expires_on = MS.expires_on - MS.age
+ MS.revokes_on = MS.revokes_on - MS.age
+
+For each `LOCAL_MINDEX[type='ACTIVE'] as MS`:
+
+ MS.expires_on = MS.expires_on - MS.age
+ MS.revokes_on = MS.revokes_on - MS.age
+
+###### BR_G105 - Certification expiry date correction
+
+For each `LOCAL_CINDEX as CERT`:
+
+ CERT.expires_on = CERT.expires_on - CERT.age
+
+##### BR_G97 - Final INDEX operations
+
+If all the rules [BR_G49 ; BR_G90] pass, then all the LOCAL INDEX values (IINDEX, MINDEX, CINDEX, SINDEX, BINDEX) have to be appended to the GLOBAL INDEX.
+
+### Peer
+
+#### Global validation
+
+##### Block
+
+* `Block` field must target an existing block in the blockchain, or target special block `0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855`.
+
+#### Interpretation
+
+* A Peer document SHOULD NOT be interpreted if its `Block` field is anterior to previously recorded Peer document for a same `PublicKey` key.
+
+### Transactions
+
+#### Local coherence
+
+* A transaction must be signed by all of its `Issuers`
+ * Signatures are to be associated to each `Issuers` according to their apparition order
+* A transaction must have at least 1 issuer
+* A transaction must have at least 1 source
+* A transaction must have at least 1 recipient
+* A transaction must have at least 1 signature
+* A transaction must have exactly the same number of signatures and issuers
+* A transaction's indexes' (`Inputs` field) value must be less than or equal to the `Issuers` line count
+* A transaction must have its issuers appear at least once in the `Inputs` field, where an issuer is linked to `INDEX` by its position in the `Issuers` field. First issuer is `INDEX = 0`.
+* A transaction's `Inputs` amount sum must be equal to the `Ouputs` amount sum.
+* A transaction cannot have two identical `Inputs`
+
+## Implementations
+
+### APIs
+
+UCP does not impose any particular APIs to deal with UCP data. Instead, UCP prefers to allow for any API definitions using [Peer](#peer) document, and then letting peers deal with the API(s) they prefer themselves.
+
+At this stage, only the [Duniter HTTP API](/HTTP_API.md) (named BASIC_MERKLED_API) is known as a valid UCP API.
+
+## References
+
+* [Relative Theory of the Money](http://en.trm.creationmonetaire.info), the theoretical reference behind Universal Dividend
+* [OpenUDC](http://www.openudc.org/), the inspiration project of Duniter
+* [Bitcoin](https://github.com/bitcoin/bitcoin), the well known crypto-currency system