Witness Client: A client for interacting with Witness.
- Fetch-based client built on OpenAPI specification
- Supports customizing fetch function for different environments
- Configurable with API key and custom RPC URL
- Verifies proofs against the chain
bun add @witnessco/clientimport { WitnessClient } from '@witnessco/client'
// Instantiate a new client, default params should suffice for now.
const witness = new WitnessClient()
// Unique string, so we get an unseen leafHash.
const sampleString = `Check the chain! @ ${Date.now()}`
const leafHash = witness.hash(sampleString)
console.log(`Posting leaf hash ${leafHash}`)
await witness.postLeaf(leafHash)
console.log('Waiting for onchain inclusion (may take up to 10min)')
await witness.waitForCheckpointedLeafHash(leafHash)
// Get the timestamp for the leaf.
const timestamp = await witness.getTimestampForLeafHash(leafHash)
console.log(`Leaf ${leafHash} was timestamped at ${timestamp}`)
// Get and verify proof.
const proof = await witness.getProofForLeafHash(leafHash)
const verified = await witness.verifyProofChain(proof)
console.log(`Proof verified: ${verified}`)See this repl for a live example.
Canonical deployments for Witness.sol are available as follows:
| Chain ID | Deployment Address |
|---|---|
| Mainnet (1) | 0x0000000e143f453f45B2E1cCaDc0f3CE21c2F06a |
| Base (8453) | 0x0000000e143f453f45B2E1cCaDc0f3CE21c2F06a |
| Optimism (10) | 0x0000000e143f453f45B2E1cCaDc0f3CE21c2F06a |
| Sepolia (11155111) | 0x00000008bcf12Eeb9E4162687D6D251f0F4e7FC2 |
| Base Sepolia (84532) | 0x0000000159C8253802551eEaf8b475db1A50d712 |
| Optimism Sepolia (11155420) | 0x0000000a3fa5CFe56b202F376cCa7334c93aEB8b |
| Arbitrum Sepolia (421614) | 0x00000006399970c8bdad606abD03b1712974E4eA |
| Gnosis Chiado (10200) | 0x000000031C0d9df77F390CED953219E561B67089 |
See the contracts-core repo for more details.
See docs.witness.co for more background on Witness, or the contracts-core repo for more details on the contracts.