2018 05 26 @ 2pm UTC

Actions

• Minisha - request for containerized SDK
• Commit PoC code to github
• First use-case. In various languages. Set up an architecture that supports that.

Discussion

General architecture

• protobuf stuff this week?
• Some refactoring on the framework?
  • Ready for the event-driven code
  • Documenting how it works. More a matter of getting straight how it's going to work.
  • Goal was to get it finished. Refactor things. Hook into event-driven model.

Comparison to HLF / Interoperability

• Comments from Alex
  • Question a bit the high level approach...
  • High level - what are we trying to build?
  • Had a presentation this week. Gave a live coding session on Composer and Fabric architecture.
  • Missing some of the high-level.
  • Show corresponding pieces of hashgraph and how it relates to hashgraph
  • Alex shared an architecture document for comparison - see discord channel
• HLF Architectural overview
  • Deployment in two organisations
  • SDK - avail in Java/GoLang/Python/Node
  • "createTransaction" method
  • Peers... Chaincode runs on the peers!
  • Endorsement response - validated by SDK
  • SDK takes response - passes them to "Orderer"
  • Orderer does consensus with other orderers in other organisations
• Desired Procedural steps
  • deploy contract
  • manage contract
  • client SDK (e.g. EXO)
  • contract packaging
  • contract execution
  • contract interaction with main node
• Longer-term considerations
  • spawning individual docker containers per node
• Open questions:
  • What will be the main process?
    • Need something to handle messaging between contracts and main/state...
    • Those messages are part of the protocol
    • TX goes to main
  • Doubts if we go this way - only very basic set of features
  • We need to consider that we cannot spawn individual smart contracts per container
  • What if network needs to handle 100 or 200
  • Can we find out what that protocol is and mirror it
  • What if Docker instance failed?
    • Retry/check transaction - run multiple times
• Raj's comments on access control
  • Composer has a modelling language for this...
    • Examples at composerplayground.bluemix.net
  • What standard?
  • Made up language, etc.
  • Code generation / "Transpiling"
• Craig's observations:
  • HLF has blockchain storage out of the box.
  • Ability to keep data in state.
  • Define tx types.
  • Messages state knows how to react to.
• Thoughts from Eamonn:
  • TinyRAM - for expressing the correctness of nondeterministic computations. Execute only TinyRAMs?
  • Interledger - OWL and RDF specs. In the context of formalizing things...
  • Zero-knowledge proofs. Ubuntu 18.04 LTS? Process inside Docker container as a example use-case
    • Use "Composer" to define, process, invoke, etc.

Other news

• New drop of the Swirlds SDK
  • Should be fully backward-compatible
• Planned absence next week:
  • Craig
  • Raj

Priorities

• Maintain focus on simple demonstrable PoCs
• Ongoing work on ChainCode
• Technical validation of concepts

Participants

• Eamonn Hynes - Northern Ireland - Allstate Corporation
• Alex Males - Romania
• Craig Drabik - TxMQ - DLT - Hyperledger + EXO project
• Raj - ChainStar