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 Sepolia here.

Add the following to the environment variable configuration (hosted proving) or .env (local proving & relaying) for the Blobstream X operator:

TENDERMINT_RPC_URL=(comma-separated list of tendermint rpc urls)

Add env variables to .env, following the .env.example. You do not need to fill out the local configuration, unless you're planning on doing local proving.

Run BlobstreamX script to request updates to the specified light client continuously. For the cadence of requesting updates, update LOOP_DELAY_MINUTES.

In /, run

cargo run --bin blobstreamx --release

To enable local proving & local relaying of proofs with the Blobstream X operator, download the proving binaries by following the instructions here.

Then, simply add the following to your .env:

LOCAL_PROVE_MODE=true
LOCAL_RELAY_MODE=true

# Add the path to each binary (ex. PROVE_BINARY_0x6d...=blobstream-artifacts/header_range)

PROVE_BINARY_0xFILL_IN_NEXT_HEADER_FUNCTION_ID=
PROVE_BINARY_0xFILL_IN_HEADER_RANGE_FUNCTION_ID=
WRAPPER_BINARY=

Add env variables to .env, following the .env.example.

If you want to relay an existing proof in /proofs, run the following command:

cargo run --bin local_relay --release -- --request-id {REQUEST_ID}

Get the genesis parameters for a BlobstreamX contract from a specific Celestia block.

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