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fix: set signatureChainId in recover_user_from_user_signed_action #312

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fix: set signatureChainId in recover_user_from_user_signed_action #312

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fix: set signatureChainId in recover_user_from_user_signed_action 
sign_user_signed_action sets both signatureChainId and hyperliquidChain on the
action, but recover_user_from_user_signed_action only set hyperliquidChain.
Since user_signed_payload reads action["signatureChainId"], recovering the
signer from a freshly reconstructed action raised KeyError: 'signatureChainId'.

Set signatureChainId symmetrically with sign_user_signed_action, and add a
sign -> recover round-trip regression test (the function had no coverage).
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@massimiliano1991
massimiliano1991 committed Aug 14, 2026
commit a08ae6e7617426808fb3d8625b408664c49db845
1 change: 1 addition & 0 deletions hyperliquid/utils/signing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -465,6 +465,7 @@ def recover_agent_or_user_from_l1_action(action, signature, active_pool, nonce,


def recover_user_from_user_signed_action(action, signature, payload_types, primary_type, is_mainnet):
action["signatureChainId"] = "0x66eee"
action["hyperliquidChain"] = "Mainnet" if is_mainnet else "Testnet"
data = user_signed_payload(primary_type, payload_types, action)
structured_data = encode_typed_data(full_message=data)
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24 changes: 24 additions & 0 deletions tests/signing_test.py
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Expand Up @@ -4,13 +4,15 @@

from hyperliquid.exchange import _multi_sig_payload_action
from hyperliquid.utils.signing import (
USD_SEND_SIGN_TYPES,
OrderRequest,
ScheduleCancelAction,
action_hash,
construct_phantom_agent,
float_to_int_for_hashing,
order_request_to_order_wire,
order_wires_to_order_action,
recover_user_from_user_signed_action,
sign_l1_action,
sign_usd_transfer_action,
sign_withdraw_from_bridge_action,
Expand Down Expand Up @@ -288,3 +290,25 @@ def test_schedule_cancel_action():
assert signature_testnet["r"] == "0x4e4f2dbd4107c69783e251b7e1057d9f2b9d11cee213441ccfa2be63516dc5bc"
assert signature_testnet["s"] == "0x706c656b23428c8ba356d68db207e11139ede1670481a9e01ae2dfcdb0e1a678"
assert signature_testnet["v"] == 27


def test_user_signed_action_recover_roundtrip():
# Regression test: recover_user_from_user_signed_action must set signatureChainId
# symmetrically with sign_user_signed_action. A verifier reconstructs the action
# without signatureChainId, so recover has to add it -- otherwise user_signed_payload
# raises KeyError: 'signatureChainId'.
wallet = eth_account.Account.from_key("0x0123456789012345678901234567890123456789012345678901234567890123")

def fresh_action():
return {
"destination": "0x0000000000000000000000000000000000000001",
"amount": "1",
"time": 1677777606040,
}

for is_mainnet in (True, False):
signature = sign_usd_transfer_action(wallet, fresh_action(), is_mainnet)
recovered = recover_user_from_user_signed_action(
fresh_action(), signature, USD_SEND_SIGN_TYPES, "HyperliquidTransaction:UsdSend", is_mainnet
)
assert recovered == wallet.address