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Protocol

Additional implementation-specific documentation for the Hydra Head protocol and extensions like incremental decommits.

Incremental Commits

Deposit L1 first

Node BChainNode AAliceNode BChainNode AAlicepar​par[Alice isLeader]par[broadcast]As decrementPOST /commit (blueprintTx)[Head is open]depositTxsign depositTxsubmit depositTxOnDepositTx utxoDepositDetectedReqInc utxoReqInc utxoCommitRequestedReqSn utxoReqSn utxosig = sign snapshot incl. inputs(commitTx)AckSn sigAckSn sigAckSn sigSnapshotConfirmedCommitApprovedIncrementTx snapshot sigOnIncrementTxCommitFinalized

Interactive L2 first

ChainNode BNode AAliceChainNode BNode AAliceAlice shows a tx spending on L1 of what she wants to commit to L2TODO input validation?get approval through a signed snapshotpar​par[Alice isLeader]par[broadcast]Alice can spend on L2 what she committed from L1POST /commit (commitTx)ReqInc commitTxReqInc commitTxCommitRequestedReqSn commitTxReqSn commitTxsig = sign snapshot incl. inputs(commitTx)AckSn sigAckSn sigAckSn sigconstruct incrementTx using multi-signed snapshot and commitTx (blueprint)incrementTxsign incrementTxsubmit incrementTxOnIncrementTx utxoOnIncrementTx utxolocalUtxo = localUtxo + utxoCommitFinalized

Incremental Decommits

ChainNode BNode AAliceChainNode BNode AAlicepar[broadcast]par[Alice isLeader]par[broadcast]Decommit (decTx)canApply decTxReqDec decTxReqDec decTxDecommitRequestedReqSn decTxReqSn decTxcanApply decTx, decUTxO =  outputs(decTx)sig = sign snapshot incl. decUTxOAckSn sigAckSn sigAckSn sigSnapshotConfirmedDecommitApprovedDecrementTx snapshot sigOnDecrementTxDecommitFinalized
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Sebastian Nagel
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What did the team achieve this

Github actions improvements and small fixes to the smoke tests #1242, #1233

Jan 12, 2024
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