Implementation of zero-knowledge proof circuits for Blobstream, Celestia's data availability solution for Ethereum.
Blobstream X's core contract is BlobstreamX, which stores commitments to ranges of data roots from Celestia blocks. Users can query for the validity of a data root of a specific block height via verifyAttestation, which proves that the data root is a leaf in the Merkle tree for the block range the specific block height is in.
headerRange is used to generate the data root of a block range. The data root is the root of a Merkle tree of the data roots of all the blocks in the block range.
To prove the last header of a block range, headerRange uses skip as a sub-circuit. After proving the last header, the headerRange circuit proves the chain of headers from the start header to the last header. From a valid chain of headers, the headerRange circuit can generate the commitment of the block range with the data root of each block in the block range.
nextHeader is used to generate the commitment to the data root of the current block.
This is rarely used, as nextHeader will only be invoked when the validator set changes by more than 2/3 in a single block.
The circuits are currently available on Succinct X here.
Blobstream X is currently deployed for Celestia Mainnet on Goerli here.
Get the genesis parameters for the BlobstreamX contract with a specific Celestia block (with no input defaults to block 1).
cargo run --bin genesis -- --block 100
Add .env variables to contracts/.env, following contracts/.env.example.
Initialize BlobstreamX contract with genesis parameters.
In contracts/, run
forge install
source .env
forge script script/Deploy.s.sol --rpc-url $RPC_URL --private-key $PRIVATE_KEY --broadcast --verify --verifier etherscan --etherscan-api-key $ETHERSCAN_API_KEY
Add env variables to .env, following .env.example.
Run BlobstreamX script to update the light client continuously.
In /, run
cargo run --bin blobstreamx --release