3rd party

[divarvel]

• [x] update proto
• [x] verify signatures
• [ ] model scope annotations in datalog
• [ ] parse scope annotations in datalog
• [ ] special-case string interning for blocks with external signatures (no table reuse)
• [ ] serialize/deserialize scope annotations in datalog
  • [ ] proper interning for public keys
• [ ] update datalog engine to take scope into account
• [ ] append a block to a given biscuit with an extra signature
• [ ] handle the request / contents messages to generate a signed block without having access to the biscuit