Step1：Rollup Aggregator invoke method verifyBatchesTrustedAggregator in PolygonZkEVM.sol
Step2: b2-committer listen for events (verifyBatchesTrustedAggregator) and store data in Mysql
Step3: b2-committer submit proposal to b2-node (send a transaction)
transaction {
"proposalId": getLastProposalId() from b2-node api,
"stateRoot": rootHash from a merkle tree which contains all the stateRoots of the batch, which are range of startBatchNum and endBatchNum,
"rootHash" from a merkle tree which contains all the proofs of the batch, which are range of startBatchNum and endBatchNum,
"startBatchNum": getFinalBatch() from b2-node rpc or rest interface,
"endBatchNum": startBatchNum + 10 (defined a constant)
Generate a proposal in b2-node depends on this transaction.
proposal {
"transaction": transaction from above describe,
"currentBlockNum": the current b2-node block number,
"voteMax": how many b2-committer node need to vote,
"txVoteNum": voteNums Step3,
"resultVoteNum": voteNums Step8,
"winAddress": which address has the entitlement to execute submitter to submit data(stateRoot and proof) to btc network
"btcTxId": btc tx id which contains the stateRoot and proof
"voteAdressList": already vote address list,
"state": (PENDING, SUCCESS, TIMEOUT),
}
simple algorithm about winAddressIndex
winAddressIndex = tx_id% voteAdressList
winAddress = voteAdressList[winAddressIndex]
you can get winAddress using api of b2-node.
after generated a proposal, put proposalId to channel[proposalId]
Step4: get proposalId from channel[proposalId]] and search proposal state from b2-node api.
if state is PENDING, and check winAddress equal local b2-committer address, then execute submitter to submit data(stateRoot and proof) to btc network
Step5: get the btcTxId from Step4, and put it in channel[btcTxId], and then update finalBatchNum in b2-node
Step6: go service loop channel[btcTxId] and get the btcTxId, and query the blockNum of btc network by btcTxId. If blockNum is confirmed, then execute Step7.
Step7: the b2-committer which execute btc transaction and get the btcTxId update the proposal btcTxId.
Step8: every b2-committer node loop their channel[proposalId] to check btcTxId is null or not. If not, then check the btcTxId blockHeight and submit a transaction to b2-node to vote.
resultVoteNum++. if resultVoteNum > 50%, then update state to SUCCESS.
Step9: loop check proposal by proposalId from channel[proposalId]. if the state of proposal is still PENDING and (currentBlockNum - proposal.currentBlockNum)> 10000, than update state to TIMEOUT and go to Step 3 again.
| env | value | description | remarks |
|---|---|---|---|
| LOG_LEVEL | info | warn、error、panic、fatal | |
| LOG_FORMAT | text | options: text、json | |
| MYSQL_DATA_SOURCE | root:root@tcp(127.0.0.1:3306)/b2_committer?charset=utf8mb4&parseTime=True&loc=Local&multiStatements=true | ||
| MYSQL_MAX_IDLE_CONNS | 10 | ||
| MYSQL_MAX_OPEN_CONNS | 20 | ||
| MYSQL_CONN_MAX_LIFETIME | 3600 | ||
| RPC_URL | https://b2-nodes.bsquared.network | B2NODE-RPC | |
| BLOCKCHAIN | B2-NODE | ||
| INIT_BLOCK_NUMBER | 0 | block-height | |
| INIT_BLOCK_HASH | 0xfbecff3c9ca93f097d243d01d027d28f9bdcdebfb3208977246504ef4dddfc08 | block-hash | |
| POLYGON_ZKEVM_ADDRESS | 0x67d269191c92Caf3cD7723F116c85e6E9bf55933 | ||
| NETWORK_NAME | testnet3 | btc-network type | |
| BITCOIN_PRIVATE_KEY | privateKey | ||
| COMMITTER_DESTINATION_ADDRESS | 0xB50109D57ae713388dc404eb2e8311bd9A8125a9 | btc commit destination |
go run main.go