agentity-evm

EVM cross-registry bridge for the Agentity Protocol. Publish DID registration and revocation events on-chain via a Solidity smart contract, and verify agent identity status across registries using read-only EVM queries.

Components

• Solidity contract (contracts/Registry.sol) — On-chain DID registry
• EvmPublisher — Python client for writing to the contract
• EvmVerifier — Python client for reading from the contract

Installation

pip install agentity-evm

Solidity contract

contract AgentityRegistry {
    function register(string calldata did, bytes32 fingerprint, string calldata providerDid) external;
    function revoke(string calldata did) external;
    function rotate(string calldata oldDid, string calldata newDid) external;
    function getStatus(string calldata did) external view returns (string memory);
    function getFingerprint(string calldata did) external view returns (bytes32);
}

Events: DIDRegistered, DIDRevoked, DIDRotated

Usage

Publisher

from agentity_evm import EvmPublisher

publisher = EvmPublisher()
publisher.connect()

# Register a DID on-chain
tx_hash = publisher.register(
    did="did:agentity:agent:7Xj3...",
    fingerprint_hex="a1b2c3...",
    provider_did="did:agentity:provider:stripe",
)
print(f"Transaction: {tx_hash}")

# Revoke
tx_hash = publisher.revoke("did:agentity:agent:7Xj3...")

Verifier

from agentity_evm import EvmVerifier

verifier = EvmVerifier(
    rpc_url="http://localhost:8545",
    contract_address="0x1234...",
)

result = verifier.verify("did:agentity:agent:7Xj3...")
# {"did": "...", "status": "active", "fingerprint": "0x...", "source": "evm"}

Configuration

Integration with registry

The agentity-registry automatically publishes to EVM when AGENTITY_EVM_RPC_URL is set:

AGENTITY_EVM_RPC_URL=http://localhost:8545 \
AGENTITY_EVM_CONTRACT=0x... \
AGENTITY_EVM_PRIVATE_KEY=0x... \
uvicorn agentity_registry.main:app --port 8000

Deploy the contract

# Using Foundry (cast)
forge create --rpc-url http://localhost:8545 \
  --private-key 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80 \
  contracts/Registry.sol:AgentityRegistry

License: Apache 2.0