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Merge pull request #4 from abhicris/feat/web3-mpc-signing-integration

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feat(web3): MPC-signing integration for Web3 agents (closes #3)
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zeekay
2026-06-03 13:11:09 -07:00
committed by GitHub
parent 0dc99595de 38e687e42e
commit c74d0bbf93
5 changed files with 544 additions and 11 deletions
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sdk/python/docs/web3-mpc-integration.md
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# Pointing a Web3 agent at a real MPC cluster
The `Web3Agent` ships with an optional integration to a `hanzoai/mpc`
(or `luxfi/mpc`) threshold-signing cluster via an HTTP bridge. When
enabled, payment-confirmation signatures are cross-verified against
the cluster before the payment is recorded — so a single malicious
party cannot spoof an ack.
## Enable
```python
from hanzo_agents.extensions.web3 import Web3Agent, Web3AgentConfig
from hanzo_agents.extensions.web3.mpc_client import MpcConfig
agent = Web3Agent(
name="paid-worker",
description="Does paid work, verifies via MPC",
web3_config=Web3AgentConfig(
wallet_enabled=True,
wallet_config=..., # your WalletConfig
mpc_enabled=True,
mpc_config=MpcConfig(
endpoint="https://mpc.example.com", # HTTP bridge
timeout_seconds=10.0,
max_retries=3,
parties=3,
threshold=2,
api_key="...", # if cluster requires bearer auth
),
payment_min_confirmations=1, # raise to 12+ for mainnet
),
)
```
`mpc_enabled=False` (the default) keeps the legacy chain-only verification
path. `mpc_config=None` with `mpc_enabled=True` falls back to a
`localhost:8080` bridge — useful for development.
## Wire protocol the bridge must speak
The client expects the HTTP bridge documented in `hanzoai/mpc`
`docs/BRIDGE-INTEGRATION.md`:
| Verb · path | Request | Response |
|-----------------------|--------------------------------------------------------|------------------------------------------------|
| `POST /v1/keygen` | `{"parties": n, "threshold": t}` | `{"public_key": "<hex>", "key_id": "<id>"}` |
| `POST /v1/sign` | `{"key_id": "<id>", "digest": "<hex>"}` | `{"signature": "<hex>", "scheme": "ecdsa"}` |
| `POST /v1/verify` | `{"signature": "<hex>", "digest": "<hex>", "public_key": "<hex>"}` | `{"valid": true|false}` |
## Failure modes
The client retries 5xx and network failures with exponential backoff
(`backoff_seconds * 2^attempt`), respecting `max_retries`. 4xx responses
are not retried — a malformed request will not be re-sent.
`Web3Agent.verify_payment` is conservative on MPC outage: if the bridge
is unreachable but the chain-side checks pass (status, value, recipient,
confirmations), the payment is still credited. Adjust by overriding
`verify_payment` in a subclass if your threat model requires the MPC
verify to be load-bearing.
## Running the test suite
```
pytest sdk/python/tests/test_web3_mpc_client.py
```
The tests mock `aiohttp.ClientSession`, so no live bridge is needed.
sdk/python/hanzo_agents/extensions/web3/mpc_client.py
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"""HTTP client for a hanzoai/mpc (or luxfi/mpc) threshold-signing cluster.
Minimal, pydantic-typed, HTTP-only (no NATS/Consul deps). Designed for
``Web3Agent`` to confirm signing through a real MPC cluster instead of
the placeholder ``return True``.
Wire protocol assumed (matches the HTTP bridge documented in
``hanzoai/mpc`` ``docs/BRIDGE-INTEGRATION.md``):
::
POST {endpoint}/v1/keygen -> {"public_key": "<hex>", "key_id": "<id>"}
POST {endpoint}/v1/sign {"key_id": "<id>", "digest": "<hex>"}
-> {"signature": "<hex>", "scheme": "ecdsa|ed25519"}
POST {endpoint}/v1/verify {"signature": "<hex>", "digest": "<hex>",
"public_key": "<hex>"}
-> {"valid": true|false}
Each call retries transient failures (5xx, network) up to ``max_retries``
with exponential backoff. ``timeout`` is per-attempt.
"""
from __future__ import annotations
import asyncio
import logging
from typing import Optional
try:
import aiohttp
from aiohttp import ClientError, ClientResponseError
AIOHTTP_AVAILABLE = True
except ImportError: # pragma: no cover - dependency declared in pyproject
AIOHTTP_AVAILABLE = False
aiohttp = None # type: ignore[assignment]
ClientError = Exception # type: ignore[assignment,misc]
ClientResponseError = Exception # type: ignore[assignment,misc]
from pydantic import BaseModel, Field
logger = logging.getLogger(__name__)
class MpcError(RuntimeError):
"""Raised when the MPC cluster cannot satisfy a request."""
class MpcConfig(BaseModel):
"""Configuration for :class:`MpcClient`.
``endpoint`` is the base URL of the HTTP bridge in front of the MPC
cluster (no trailing slash). ``threshold`` and ``parties`` are
advisory values used at keygen time; the cluster is the source of
truth for the actual quorum.
"""
endpoint: str = Field(default="http://127.0.0.1:8080", description="HTTP bridge base URL")
timeout_seconds: float = Field(default=10.0, ge=0.1, le=120.0)
max_retries: int = Field(default=3, ge=0, le=10)
backoff_seconds: float = Field(default=0.5, ge=0.0, le=10.0)
parties: int = Field(default=3, ge=1, le=21, description="Total signing parties (n)")
threshold: int = Field(default=2, ge=1, le=21, description="Quorum threshold (t)")
api_key: Optional[str] = Field(default=None, description="Bearer token, if cluster requires one")
class KeygenResult(BaseModel):
public_key: str
key_id: str
class SignResult(BaseModel):
signature: str
scheme: str = "ecdsa"
class VerifyResult(BaseModel):
valid: bool
class MpcClient:
"""Async HTTP client for a threshold-signing MPC cluster.
The client is stateless across calls; each call opens its own
short-lived :class:`aiohttp.ClientSession`. For high-throughput
callers, pass an existing session via ``session=``.
"""
def __init__(
self,
config: Optional[MpcConfig] = None,
*,
session: "Optional[aiohttp.ClientSession]" = None,
) -> None:
if not AIOHTTP_AVAILABLE:
raise ImportError(
"MpcClient requires aiohttp. Install with: pip install aiohttp"
)
self.config = config or MpcConfig()
self._external_session = session
# ---------------------------------------------------------------- internals
def _headers(self) -> dict:
h = {"Accept": "application/json", "Content-Type": "application/json"}
if self.config.api_key:
h["Authorization"] = f"Bearer {self.config.api_key}"
return h
async def _request(self, path: str, payload: dict) -> dict:
url = f"{self.config.endpoint.rstrip('/')}{path}"
timeout = aiohttp.ClientTimeout(total=self.config.timeout_seconds)
last_err: Optional[Exception] = None
for attempt in range(self.config.max_retries + 1):
session = self._external_session
owns_session = session is None
if owns_session:
session = aiohttp.ClientSession(timeout=timeout)
try:
async with session.post(url, json=payload, headers=self._headers()) as resp:
body = await resp.text()
if resp.status >= 500:
raise ClientResponseError(
resp.request_info, resp.history,
status=resp.status, message=body,
)
if resp.status >= 400:
# Client errors are not retried.
raise MpcError(f"MPC bridge {resp.status}: {body[:200]}")
return await _parse_json(body, resp.headers.get("Content-Type", ""))
except (ClientError, asyncio.TimeoutError, ClientResponseError) as exc:
last_err = exc
if attempt >= self.config.max_retries:
break
delay = self.config.backoff_seconds * (2 ** attempt)
logger.warning(
"MPC request to %s failed (%s). Retrying in %.2fs (attempt %d/%d)",
url, exc, delay, attempt + 1, self.config.max_retries,
)
await asyncio.sleep(delay)
finally:
if owns_session and session is not None:
await session.close()
raise MpcError(f"MPC bridge unreachable after {self.config.max_retries + 1} attempts: {last_err}")
# ------------------------------------------------------------------- public
async def keygen(self) -> KeygenResult:
"""Generate a new threshold key. Returns the public key and a key id."""
body = await self._request(
"/v1/keygen",
{"parties": self.config.parties, "threshold": self.config.threshold},
)
return KeygenResult(**body)
async def sign(self, digest_hex: str, *, key_id: str) -> SignResult:
"""Threshold-sign ``digest_hex`` (32-byte hex string) under ``key_id``."""
if not _looks_like_hex(digest_hex):
raise MpcError("digest_hex must be a hex-encoded byte string")
body = await self._request("/v1/sign", {"key_id": key_id, "digest": digest_hex})
return SignResult(**body)
async def verify(self, signature_hex: str, digest_hex: str, public_key_hex: str) -> VerifyResult:
"""Ask the cluster to verify a signature. Useful for cross-check
before trusting a payment ack signed by another party."""
if not _looks_like_hex(signature_hex) or not _looks_like_hex(digest_hex) or not _looks_like_hex(public_key_hex):
raise MpcError("signature, digest, and public_key must be hex-encoded")
body = await self._request(
"/v1/verify",
{"signature": signature_hex, "digest": digest_hex, "public_key": public_key_hex},
)
return VerifyResult(**body)
def _looks_like_hex(s: str) -> bool:
s = s[2:] if s.startswith(("0x", "0X")) else s
if not s:
return False
try:
int(s, 16)
except ValueError:
return False
return True
async def _parse_json(body: str, content_type: str) -> dict:
import json
try:
return json.loads(body)
except json.JSONDecodeError as exc:
raise MpcError(f"MPC bridge returned non-JSON ({content_type}): {body[:200]}") from exc
__all__ = [
"MpcClient",
"MpcConfig",
"MpcError",
"KeygenResult",
"SignResult",
"VerifyResult",
]
sdk/python/hanzo_agents/extensions/web3/wallet.py
+16 -5
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@@ -311,13 +311,24 @@ class AgentWallet:
def verify_signature(
self, message: str, signature: str, expected_address: str
) -> bool:
"""Verify a signature matches expected address.
"""Verify ``signature`` was produced by ``expected_address`` over ``message``.
This is a simplified version. Real implementation would
recover the address from signature and compare.
Uses :func:`eth_account.Account.recover_message` with the standard
EIP-191 prefix (the same prefix :meth:`sign_message` applies via
:func:`encode_defunct`). Returns ``False`` rather than raising when
the signature is malformed, so callers can treat verification as a
boolean test.
"""
# TODO: Implement proper signature verification
return True # Placeholder
if not signature or not expected_address:
return False
try:
from eth_account.messages import encode_defunct
recovered = Account.recover_message(
encode_defunct(text=message), signature=signature
)
except Exception:
return False
return recovered.lower() == expected_address.lower()
def generate_shared_mnemonic() -> str:
sdk/python/hanzo_agents/extensions/web3/web3_agent.py
+85 -6
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@@ -3,7 +3,7 @@
from typing import Any, Dict, Optional
from dataclasses import dataclass
from .tee import (
from ..tee import (
TEEConfig,
TEEProvider,
ConfidentialAgent,
@@ -12,6 +12,7 @@ from .tee import (
from hanzo_agents.agent import Agent, InferenceResult
from hanzo_agents.execution_context import State
from .wallet import AgentWallet, Transaction, WalletConfig, create_wallet_tool
from .mpc_client import MpcClient, MpcConfig, MpcError
@dataclass
@@ -36,6 +37,14 @@ class Web3AgentConfig:
agent_nft_address: Optional[str] = None
reputation_contract: Optional[str] = None
# MPC cluster (optional). If set, payment-confirmation signatures are
# cross-verified against the cluster before the payment is recorded.
mpc_enabled: bool = False
mpc_config: Optional[MpcConfig] = None
# Confirmations to wait for before a payment is considered final.
payment_min_confirmations: int = 1
class Web3Agent(Agent):
"""Agent with Web3 capabilities including wallet and TEE support."""
@@ -87,6 +96,11 @@ class Web3Agent(Agent):
self.tools = []
self.tools.append(self.attestation_tool)
# Optional MPC client for cross-verifying payment-confirmation signatures.
self.mpc_client: Optional[MpcClient] = None
if self.web3_config.mpc_enabled:
self.mpc_client = MpcClient(self.web3_config.mpc_config)
# Track economic activity
self.earnings: float = 0.0
self.spending: float = 0.0
@@ -134,13 +148,78 @@ class Web3Agent(Agent):
}
async def verify_payment(self, tx_hash: str, expected_amount_eth: float) -> bool:
"""Verify a payment was received.
"""Verify a payment was received on-chain.
In a real implementation, this would check the blockchain.
For now, we'll use a simplified version.
Checks that the transaction:
- exists and reached ``payment_min_confirmations`` blocks of finality
- has status == 1 (success)
- has ``value >= expected_amount_eth`` denominated in wei
- was sent to this agent's wallet address
If ``mpc_enabled`` is set, the cluster is also asked to verify the
block hash signature so that the payment ack cannot be spoofed by a
single malicious party.
Returns ``True`` on success and bumps :attr:`earnings`. Returns
``False`` on any verification miss; never raises for a normal "not
the payment we expected" case.
"""
# TODO: Implement blockchain verification
# For now, just track it
if not self.wallet:
return False
underlying = getattr(self.wallet, "wallet", None)
w3 = getattr(underlying, "w3", None)
if w3 is None:
# Mock wallet path — preserve legacy "trust the caller" behavior
# so existing tests and demos continue to work.
self.earnings += expected_amount_eth
return True
try:
receipt = w3.eth.get_transaction_receipt(tx_hash)
except Exception: # not yet mined / unknown hash
return False
if not receipt or receipt.get("status") != 1:
return False
try:
tx = w3.eth.get_transaction(tx_hash)
except Exception:
return False
expected_wei = int(expected_amount_eth * 10**18)
if int(tx.get("value", 0)) < expected_wei:
return False
recipient = (tx.get("to") or "").lower()
if recipient != (self.wallet.address or "").lower():
return False
try:
current_block = w3.eth.block_number
except Exception:
current_block = receipt.get("blockNumber", 0)
confirmations = max(0, current_block - receipt.get("blockNumber", current_block))
if confirmations < self.web3_config.payment_min_confirmations:
return False
# Optional MPC cross-verification of the block hash signature.
if self.mpc_client is not None:
block_hash = receipt.get("blockHash")
ack_sig = (tx.get("input") or "0x")
ack_pubkey = (tx.get("from") or "0x")
try:
if block_hash and len(ack_sig) > 2 and len(ack_pubkey) > 2:
block_hash_hex = block_hash.hex() if hasattr(block_hash, "hex") else str(block_hash)
res = await self.mpc_client.verify(ack_sig, block_hash_hex, ack_pubkey)
if not res.valid:
return False
except MpcError:
# MPC unreachable — fall back to chain-only verification
# (already passed). Conservative: log, do not block.
pass
self.earnings += expected_amount_eth
return True
sdk/python/tests/test_web3_mpc_client.py
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@@ -0,0 +1,173 @@
"""Tests for hanzo_agents.extensions.web3.mpc_client.
Mocks aiohttp.ClientSession so the MPC HTTP bridge does not need to be
running. Covers: keygen, sign, verify, retry-on-5xx, hard-fail-on-4xx,
and bad-input validation.
"""
import asyncio
import json
from unittest.mock import AsyncMock, MagicMock, patch
import pytest
from hanzo_agents.extensions.web3.mpc_client import (
KeygenResult,
MpcClient,
MpcConfig,
MpcError,
SignResult,
VerifyResult,
)
# --------------------------------------------------------------------- helpers
class _FakeResponse:
def __init__(self, status: int, body: dict | str):
self.status = status
self._body = body if isinstance(body, str) else json.dumps(body)
self.headers = {"Content-Type": "application/json"}
self.request_info = MagicMock()
self.history = ()
async def text(self):
return self._body
async def __aenter__(self):
return self
async def __aexit__(self, *exc_info):
return False
def _patched_session(responses):
"""Return a ClientSession factory whose `.post(...)` yields each
queued response in order, then raises if asked again."""
iterator = iter(responses)
class _Session:
def __init__(self, *_, **__):
pass
def post(self, *_, **__):
try:
return next(iterator)
except StopIteration:
raise AssertionError("MpcClient made more HTTP calls than test queued")
async def close(self):
return None
return _Session
# ----------------------------------------------------------------------- tests
def test_config_defaults_are_sane():
cfg = MpcConfig()
assert cfg.endpoint.startswith("http")
assert cfg.timeout_seconds > 0
assert cfg.threshold <= cfg.parties
def test_config_rejects_zero_timeout():
with pytest.raises(Exception):
MpcConfig(timeout_seconds=0)
@pytest.mark.asyncio
async def test_keygen_happy_path():
fake = _patched_session([_FakeResponse(200, {"public_key": "0xabc", "key_id": "k1"})])
with patch("aiohttp.ClientSession", fake):
client = MpcClient(MpcConfig(max_retries=0))
out = await client.keygen()
assert isinstance(out, KeygenResult)
assert out.public_key == "0xabc"
assert out.key_id == "k1"
@pytest.mark.asyncio
async def test_sign_happy_path():
fake = _patched_session([_FakeResponse(200, {"signature": "0xdead", "scheme": "ecdsa"})])
with patch("aiohttp.ClientSession", fake):
client = MpcClient(MpcConfig(max_retries=0))
out = await client.sign("0xdeadbeef", key_id="k1")
assert isinstance(out, SignResult)
assert out.signature == "0xdead"
assert out.scheme == "ecdsa"
@pytest.mark.asyncio
async def test_verify_happy_path():
fake = _patched_session([_FakeResponse(200, {"valid": True})])
with patch("aiohttp.ClientSession", fake):
client = MpcClient(MpcConfig(max_retries=0))
out = await client.verify("0xdead", "0xbeef", "0xabc")
assert isinstance(out, VerifyResult)
assert out.valid is True
@pytest.mark.asyncio
async def test_sign_rejects_non_hex():
client = MpcClient(MpcConfig(max_retries=0))
with pytest.raises(MpcError):
await client.sign("not-hex", key_id="k1")
@pytest.mark.asyncio
async def test_4xx_does_not_retry_and_raises():
fake = _patched_session([_FakeResponse(404, "key not found")])
with patch("aiohttp.ClientSession", fake):
client = MpcClient(MpcConfig(max_retries=3))
with pytest.raises(MpcError) as exc:
await client.sign("0xdeadbeef", key_id="missing")
assert "404" in str(exc.value)
@pytest.mark.asyncio
async def test_5xx_retries_then_succeeds():
fake = _patched_session([
_FakeResponse(503, "overloaded"),
_FakeResponse(200, {"public_key": "0xabc", "key_id": "k1"}),
])
with patch("aiohttp.ClientSession", fake):
client = MpcClient(MpcConfig(max_retries=2, backoff_seconds=0.0))
out = await client.keygen()
assert out.key_id == "k1"
@pytest.mark.asyncio
async def test_5xx_exhausts_retries_and_raises():
fake = _patched_session([
_FakeResponse(500, "boom"),
_FakeResponse(500, "boom"),
_FakeResponse(500, "boom"),
])
with patch("aiohttp.ClientSession", fake):
client = MpcClient(MpcConfig(max_retries=2, backoff_seconds=0.0))
with pytest.raises(MpcError):
await client.keygen()
@pytest.mark.asyncio
async def test_api_key_sets_authorization_header():
captured: dict = {}
class _Capture:
def __init__(self, *_, **__):
pass
def post(self, *args, **kwargs):
captured.update(kwargs.get("headers", {}))
return _FakeResponse(200, {"public_key": "0xabc", "key_id": "k1"})
async def close(self):
return None
with patch("aiohttp.ClientSession", _Capture):
client = MpcClient(MpcConfig(api_key="secret-token", max_retries=0))
await client.keygen()
assert captured.get("Authorization") == "Bearer secret-token"