UCPv0.2: change the identity document timestamp
The identity document (self-certification) is changing. The timestamp field previously was a realtime ("real life" timestamp) and will now be a blocktime.
Previously we had:
UID:IDENTIFIER
META:TS:TIMESTAMP
SIGNATURE
Now we have:
UID:IDENTIFIER
META:TS:BLOCK_NUMBER-BLOCK_HASH
SIGNATURE
This change has impact on:
- identity document
- certification document (because the identity to be signed has a new format)
- revokation document (idem)