CometBFT for Cross-Chain Communication in Polygon
summary
Migration rewrites Heimdall v1 to Heimdall v2 by swapping Tendermint for CometBFT and upgrading to Cosmos SDK 0.50, wiping historic blocks but preserving four–five years of app state via a genesis translation and verification pipeline. Consensus changes add vote extensions and ABCI++ to vote-approve side-transactions (checkpoints/state-sync) at proposer/prepare/verify stages. A migrate command converts a ~5 GB genesis (export ~5 min, verify 15–20 min). Result: finality drops ~90s→5s, block time down 5×, far fewer reorgs, migration completes on mainnet in July.
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chapters (9)
- 0:00CometBFT cross-chain intro
- 2:27Migrating from Tendermint to CometBFT
- 3:31Side transactions with vote extensions
- 5:19Forking CometBFT and Cosmos SDK
- 6:43Migrating v1 to v2 data
- 8:30Executing migration and genesis upgrade
- 10:17Launching Hemel V2 and validators
- 11:21Demo: checkpoint and state sync
- 12:25Outcomes and future plans
