diff --git a/README.md b/README.md
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@@ -12,3 +12,7 @@ This repository contains the slides of Moul’s presentations and conferences ab
## [RML12 − Bordeaux − 22th November 2018](https://rml12.duniter.io/)
- [Silkaj evolution](https://moul.duniter.io/slides/silkaj_evolution/)
- [Video on TuTube](https://www.youtube.com/watch?v=xKTm6lNRGxE)
+
+## [RML13 − Perpignan − 23th May 2019](http://rml13.creationmonetaire.info/)
+- [How to send a transaction](https://moul.duniter.io/slides/how_to_send_a_transaction/)
+- [Video on TuTube](https://www.youtube.com/watch?v=5H7cYOWAkfk)
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+<!DOCTYPE html>
+<html>
+ <head>
+ <title>How to send a transaction</title>
+ <meta charset="utf-8">
+ <link rel="stylesheet" href="../css/styles.css" />
+ <style>
+ @font-face{
+ font-family: 'Ubuntu Mono';
+ src: url('../css/UbuntuMono-R.ttf');
+ }
+ @font-face{
+ font-family: 'Yanone Kaffesatz';
+ src: url('YanoneKaffeesatz-Regular.otf');
+ }
+ h1, h2, h3 { font-family: 'Yanone Kaffeesatz'; font-weight: normal; }
+ .remark-code, .remark-inline-code { font-family: 'Ubuntu Mono'; }
+ </style>
+ </head>
+ <body>
+ <script src="../js/remark-latest.min.js">
+ </script>
+ <script>
+ var slideshow = remark.create({
+ sourceUrl: 'presentation.md',
+ countIncrementalSlides: false,
+ });
+ </script>
+ </body>
+</html>
diff --git a/public/how_to_send_a_transaction/presentation.md b/public/how_to_send_a_transaction/presentation.md
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+name:begin
+class: center, middle
+
+# How to send a transaction
+
+RML13 − 23th May 2019 − Perpignan − Moul
+
+.center[<img src="../images/silkaj_logo.svg" width=30 /> <img src="../images/duniterpy_logo.png" width=30 /> <img src="../images/g1_logo.svg" width=30 /> <img src="../images/duniter_logo.svg" width=30 /> <img src="../images/durs_logo.png" width=30 /> <img src="../images/cesium_logo.svg" width=30 />]
+
+
+---
+### Presentation
+--
+
+- Moul, https://moul.re
+--
+
+- Joined Duniter project around 2014−5
+--
+
+- Silkaj author and developer: CLI client
+
+.center[<img src="../images/silkaj_logo.svg" width=60 />]
+
+--
+
+- DuniterPy Developer: Python library for Duniter clients
+
+.center[<img src="../images/duniterpy_logo.png" width=60 />]
+
+---
+### Outline
+--
+
+- Documents
+???
+- Presentation of Duniter documents
+
+--
+
+- Source management
+???
+- Present: How sources of money is managed in Duniter
+--
+
+- Transaction
+???
+- Transaction document in details
+--
+
+- Signature
+???
+- How can we unsure that the document have well been issued by its author?
+--
+
+- Study cases
+???
+- Practical studies on different cases we could encounter while sending a tx
+
+---
+
+### Glossary
+--
+
+- tx: Transaction
+--
+
+- ud: Universal Dividend
+--
+
+- wot: Web of Trust
+
+---
+### Duniter documents
+--
+
+- A crypto-currency usually implements the block and the transaction documents
+
+--
+
+- Duniter implements four additional WoT documents:
+ - certification, identity, membership, and revocation
+
+--
+
+- Five documents sent by a Duniter client:
+ - transaction
+ - certification
+ - identity
+ - membership
+ - recovation
+
+???
+- Not of our interest, but there is also the smart contract document, implemented by Ethereum
+
+- Focus on the transaction document
+ - Most used document
+ - Most complex document
+
+---
+name: source
+### Money source management in Duniter
+
+???
+Before talking about the transaction, we have to understand how sources of money works in Duniter
+
+--
+ ______
+ | |
+ | +UD | block "dividend": 1007,
+ |______|
+
+???
+- All sources are created through an UD
+
+--
+
+
+
+ inputs
+ \ /
+ ______
+ | |
+ | Tx |
+ |______|
+ \ /
+ outputs
+
+???
+- Inputs and outputs of sources
+
+---
+template: source
+
+--
+
+`curl <host>:<port>/tx/sources/<pubkey>`
+--
+
+```json
+"type": "T",
+"noffset": 0,
+"identifier": "5E1713DA1401D43FDBD0CD0AB430F91A054D56B34C32B0DDEA7560BDE02221BC",
+"amount": 100000,
+"base": 0,
+"conditions": "SIG(Tu2Ch53QxEvA7yfo5VDUt6vL7grqQ3asuT6vGEcG3sw4k)"
+```
+--
+
+- `type`: A source can either come from an UD (`D`) or a TX (`T`)
+--
+
+- ud:
+ - `noffset`: the block number
+ - `identifier`: the public key of the creator
+???
+- Identify the source of this source
+--
+
+- tx:
+ - `noffset`: position among the outputs
+ - `identifier`: hash of the tx
+--
+
+- `amount`: source amount
+--
+
+- `base`: decimal base of the amount
+???
+- Why do we specify a base here?
+ - This is to handle big numbers.
+ - As creating of lots of money
+ - As the databases are limited by the size limit of integer.
+ - We implemented a rotation of the numbers
+--
+
+- `conditions`: conditions to unlock the source
+
+---
+
+### Transaction
+--
+name: tx
+
+```bash
+Version: 10
+Type: Transaction
+Currency: g1-test
+Blockstamp: 364442-0004F5855ACC76545A0C2170407107FBB202AC8F601BF71FCD4F746DE12FF4F5
+Locktime: 0
+Issuers: WULdRTxspGdJzrs4vpZsWLGWsu37DjqoHyhGDFr5amh
+Inputs: 5550:0:T:45FEF6B2D5BE516E308B68CFF5E263BCA366B110B82B096C29AA6177FD53CDF3:0
+Unlocks:
+0:SIG(0)
+Outputs:
+5550:0:SIG(5B8iMAzq1dNmFe3ZxFTBQkqhq4fsztg1gZvxHXCk1XYH)
+Comment: Tx RML13
+9iyE4ENArPpJRAAOunb7K1iqUHeANkxxY9kgryv62VP6npzqSVLExhPerL1K9bage6Yj8lZ47kmAOBkGQLjUBA==
+```
+--
+
+- `Version`: version of the document
+???
+Made for evolutions
+--
+
+- `Type`: Transaction, Certification,…
+???
+Public: Can someone tell me what are the three others documents?
+--
+
+- `Currency`: currency name: g1, g1-test
+--
+
+- `Blockstamp`: block number + hash of the block in which the tx have be added
+--
+
+- `Locktime`: delay Δt before the tx could be included
+???
+Feature not implemented by any client today
+
+---
+template: tx
+
+- `Issuers`: list of pubkeys’ issuers
+???
+Yeah, there could be several issuers of a single transaction
+--
+
+- `Inputs` sources: `amount:base:type:identifier:noffset`
+--
+
+- `Unlocks`: conditions to unlock inputs: `input position:` + `SIG(0)` or `XHX(password)`
+<!--
+https://git.duniter.org/nodes/typescript/duniter/blob/dev/doc/Protocol.md#locking-and-unlocking-functions
+-->
+--
+
+- `Outputs` sources: `amount:base:condition`
+--
+
+- `Comment`: transaction reference
+
+--
+- signatures: encryptions of the document’s hash from the issuers’ private keys
+
+---
+
+### Output lock conditions
+--
+
+- `SIG`: `pubkey`: SIGnature from a pubkey allowed to free the source
+--
+
+- `CLTV`: `CheckLockTimeVerify`: absolute time: `timestamp`:
+ - source unlocked when this absolute timestamp has been reached
+--
+
+- `CSV`: `CheckSequenceVerify`: relative time: `time`:
+ - source unlocked when the specified time has been elapsed since the tx have been sent
+--
+
+- `XHX`: `X` Hash of password: `sha_hash`:
+ - Allows to unlock a source with a password
+ - Allows cross-currency tx.
+--
+
+- This four conditions can be compiled together with operators:
+ - and: `&&`
+ - or: `||`
+ - `(`, `)`, and space
+--
+
+- There is a limit of 1.000 characters
+<!--
+https://git.duniter.org/nodes/typescript/duniter/blob/dev/doc/Protocol.md#input-condition
+https://en.bitcoin.it/wiki/Timelock
+-->
+
+---
+#### Inputs’ unlocks and outputs’ locks conditions
+--
+
+- To unlock `CLTV` and `CSV`, is by waiting, they do not exits as input unlocks
+--
+
+- SIG and XHX output conditions and Input unlocks are working in pairs
+--
+
+- If an output have been locked with a certain SIG, it can only be unlocked with this SIG:
+ - tx1: output condition: SIG(pubkey_recipient)
+ - tx2: input unlock: `0:SIG(0)` + signature of the recipient
+--
+
+- If an output have been locked with a XHX, it has to be unlocked with a XHX and the good password:
+ - hash = SHA256(password)
+ - tx1: output condition: XHX(hash)
+ - tx2 input unlock: XHX(password)
+
+---
+#### Signature: How documents truthfullness get verified
+<!--
+Source: https://commons.wikimedia.org/wiki/File:Digital_Signature_diagram.svg
+https://medium.com/@seandotau/digital-signatures-and-the-blockchain-716a6bc3c25e
+-->
+???
+- How can we unsure that the document have well been issued by its author?
+- What if someone could send a transaction from your wallet, a certification from your member account?
+--
+
+
+???
+- Signing process: document content + signatures: hash(content)
+- The node compare the document and the signature hash thanks to the public key
+- Hash: Scrypt
+- Encryption/Decryption, Signature: libsodium
+- Same mechanism for all cryptocurrencies and for all Duniter’s documents.
+---
+
+class: center, middle
+
+## Study practical cases
+???
+Let’s jump to practical examples
+
+---
+
+#### How to send a transaction if the pubkey only has a bigger source?
+???
+What if we have a big source and we want to sent a transaction of a certain amount. How could you proceed?
+--
+
+```bash
+Version: 10
+Type: Transaction
+Currency: g1-test
+Blockstamp: 364442-0004F5855ACC76545A0C2170407107FBB202AC8F601BF71FCD4F746DE12FF4F5
+Locktime: 0
+Issuers: WULdRTxspGdJzrs4vpZsWLGWsu37DjqoHyhGDFr5amh
+Inputs: 5550:1:T:45FEF6B2D5BE516E308B68CFF5E263BCA366B110B82B096C29AA6177FD53CDF3:0
+20000:1:T:481D471F8D6065ACB911EDE504C07776D185396E77C98538F1D672C5DFCB271F:0
+Unlocks:
+0:SIG(0)
+1:SIG(0)
+Outputs:
+5945:1:SIG(5B8iMAzq1dNmFe3ZxFTBQkqhq4fsztg1gZvxHXCk1XYH)
+19605:1:SIG(WULdRTxspGdJzrs4vpZsWLGWsu37DjqoHyhGDFr5amh)
+Comment: Tx RML13
+9iyE4ENArPpJRAAOunb7K1iqUHeANkxxY9kgryv62VP6npzqSVLExhPerL1K9bage6Yj8lZ47kmAOBkGQLjUBA==
+```
+
+???
+Return back change to the issuer
+- Has some might some might have noticed, previous transaction was simplified.
+- And the source was the exact amount we wanted.
+- That’s pretty rare. So, a usual tx looks like this one.
+
+---
+
+#### How to send Ğ1 10.000?
+--
+
+- Transactions are limited to 40 inputs
+--
+
+- So, if you do not manage to combine the amount with this 40 sources
+--
+
+- You’ll have to compine thoses sources into one.
+--
+
+- This is what is called a change operation
+--
+
+- The programm could chain several intermediaries txs
+
+---
+
+#### How to send a single transaction to many recipients
+--
+
+- Transactions generated by Remuniter and Silkaj to remunerate blocks’ issuers and Duniter contributors
+--
+
+```json
+"outputs": [
+ "20140:0:SIG(2ny7YAdmzReQxAayyJZsyVYwYhVyax2thKcGknmQy5nQ)",
+ "20140:0:SIG(FEkbc4BfJukSWnCU6Hed6dgwwTuPFTVdgz5LpL4iHr9J)",
+ "20140:0:SIG(D9D2zaJoWYWveii1JRYLVK3J4Z7ZH3QczoKrnQeiM6mx)",
+ "20140:0:SIG(38MEAZN68Pz1DTvT3tqgxx4yQP6snJCQhPqEFxbDk4aE)",
+ "20140:0:SIG(5cnvo5bmR8QbtyNVnkDXWq6n5My6oNLd1o6auJApGCsv)",
+ "20140:0:SIG(GfKERHnJTYzKhKUma5h1uWhetbA8yHKymhVH2raf2aCP)",
+ "20140:0:SIG(7F6oyFQywURCACWZZGtG97Girh9EL1kg2WBwftEZxDoJ)",
+ "20140:0:SIG(HQKzoCALqqkAZhZHXGMvDjvGuceKdGjtb8MpMYJnoxvJ)",
+ "20140:0:SIG(CRBxCJrTA6tmHsgt9cQh9SHcCc8w8q95YTp38CPHx2Uk)",
+ "20140:0:SIG(2sZF6j2PkxBDNAqUde7Dgo5x3crkerZpQ4rBqqJGn8QT)",
+ "20140:0:SIG(4FgeWzpWDQ2Vp38wJa2PfShLLKXyFGRLwAHA44koEhQj)",
+ "20140:0:SIG(55oM6F9ZE2MGi642GGjhCzHhdDdWwU6KchTjPzW7g3bp)",
+ "20140:0:SIG(BH8ZqCsp4sbHeDPPHpto53ukLLA4oMy4fXC5JpLZtB2f)",
+ "20140:0:SIG(45GfjkWCWQhJ3epJVGC2NSg1Rcu4Ue1vDD3kk9eLs5TQ)",
+ "20140:0:SIG(77UVGVmbBLyh5gM51X8tbMtQSvnMwps2toB67qHn32aC)",
+ "20140:0:SIG(Do99s6wQR2JLfhirPdpAERSjNbmjjECzGxHNJMiNKT3P)",
+ "32332:0:SIG(78ZwwgpgdH5uLZLbThUQH7LKwPgjMunYfLiCfUCySkM8)"
+],
+```
+
+???
+multi-output tx
+
+---
+
+#### How to send a transaction with unlockable sources at a certain time
+
+--
+
+- CSV(time):
+--
+
+CSV(time.now() + 48h)
+
+--
+
+- CLTV(timestamp):
+--
+
+CLTV(48h)
+
+---
+
+#### Password locking with XHX
+--
+
+- tx1:
+```python
+password = "rml13"
+hash = SHA256(password)
+output_condition = "XHX(hash)"
+```
+--
+
+- tx2:
+```python
+input_unlock = "XHX(password)"
+```
+--
+
+- Node:
+```python
+SHA256(password) = hash
+```
+???
+Check that password hashed passed in the input unlock equals the hash of the source
+
+---
+
+#### How to send a transaction from several issuers
+???
+- Let’s imagine you want to send a big transaction from two wallets
+- Otherwise you would not have enough money for this tx
+- The client should implement a way to sign twice the document by asking twice the authentication
+--
+
+- inputs from several issuers
+--
+
+- signature from several issuers
+
+---
+#### Cross-currencies exchange
+--
+
+- Locktime: 48h
+--
+
+- `(XHX(SHA256(password)) && SIG(recipient)) || (SIG(issuer) && CLTV(48h))`
+
+<!--
+https://duniter.org/en/transactions-0-2-overview/
+https://duniter.org/fr/transactions-0-2-overview/
+-->
+
+---
+
+### [Silkaj v0.7.0 release](https://forum.duniter.org/t/silkaj-v0-7-0-release-duniterpy/6099)
+???
+Released this week-end
+--
+
+- Migration to DuniterPy and Click
+--
+
+- Display Txs history
+--
+
+- Debian, and Ubuntu packages
+--
+
+.center[<img src="../images/silkaj_logo.svg" width=150 />]
+
+---
+
+name: links
+### Links
+#### General
+- Technical Forum: [forum.duniter.org](https://forum.duniter.org)
+- XMPP chatroom [chat.duniter.org](https://chat.duniter.org)
+ - [xmpp:duniter@muc.duniter.org](xmpp:duniter@muc.duniter.org)
+- Matrix chatroom: `#duniter:matrix.org`
+- Duniter forge: https://git.duniter.org
+--
+
+#### Dig deeper
+- DuniterPy examples: Send transaction:
+ - https://git.duniter.org/clients/python/duniterpy/blob/dev/examples/send_transaction.py
+- Duniter Protocol: https://git.duniter.org/nodes/typescript/duniter/blob/dev/doc/Protocol.md
+- Cross-currencies txs article: https://duniter.org/en/transactions-0-2-overview/
+
+---
+
+### Credit
+- Slides published under the GNU GPL v3 free license
+
+- Slide source: [git.duniter.org/moul/slides](https://git.duniter.org/moul/slides)
+- Slide Pages: [moul.duniter.io/slides/how_to_send_a_tx](https://moul.duniter.io/slides/how_to_send_a_transaction/)
+- Slideshow created using [remark](https://github.com/gnab/remark)
+--
+
+### Donation
+- Public key as a QRcode:
+<img src="../images/qrcode.png" width=100 />
+
+- My public key: GfKERHnJTYzKhKUma5h1uWhetbA8yHKymhVH2raf2aCP
+???
+If you did appreciate the presentation, you can donate here
+
+---
+class: center, middle
+
+## Thanks
+???
+Thank you for your attention
+
+---
+
+class: center, middle
+## Questions?
+(En français si vous le souhaitez)
+???
+If you have a question, this is the right moment
+
+---
+
+name: end
+class: center, middle
+.center[<img src="../images/g1_logo.svg" width=500 />]