AT Protocol Notary (atnotary)

Create permanent, verifiable attestations of AT Protocol records using Ethereum Attestation Service (EAS).

Why

• Standardized attestations - interoperable format used across ecosystem
• On-chain verification - stored on Ethereum/Base, immutable and public
• Composable - other projects can reference and build on attestations
• Infrastructure - explorers, indexers, and tooling already exist
• Multi-chain - works on Ethereum, Base, Optimism, Arbitrum

What Gets Attested

• recordURI - Full AT Protocol URI
• cid - AT Protocol's content identifier
• contentHash - DAG-CBOR hash
• pds - Personal Data Server URL
• timestamp - When attested

Install

npm install -g atnotary

Setup

1. Create config file:

atnotary config

2. Edit .atnotary.yaml:

privateKey: "0x..."       # private key for writing
network: base-sepolia     # default network

3. Get testnet ETH:
   • Sepolia: https://sepoliafaucet.com/
   • Base Sepolia: https://bridge.base.org/

That's it! Default schemas are provided for all networks.

Custom Schema (Optional)

If you want to deploy your own schema:

atnotary init --network sepolia

Then add the schemaUID to your .atnotary.yaml file.

Usage

# notarize
atnotary notarize "at://did:plc:xxx/app.bsky.feed.post/abc"

# verify
atnotary verify "0xabc..." --network sepolia

# compare with current state
atnotary verify "0xabc..." --compare

Library Usage

import { ATProtocolNotary } from 'atnotary';

const notary = new ATProtocolNotary({
  privateKey: "0x...", // optional, just for writing
}, 'sepolia');

const result = await notary.notarizeRecord('at://...');
const attestation = await notary.verifyAttestation('0x...');
const comparison = await notary.compareWithCurrent(attestation);

Networks

• Ethereum Sepolia (testnet)
• Base Sepolia (testnet)
• Base (mainnet)

Use Cases

• Political accountability
• Journalism evidence
• Open source governance
• Content authorship proof
• Legal documentation

License

MIT