> ## Documentation Index
> Fetch the complete documentation index at: https://cobo.com/developers/llms.txt
> Use this file to discover all available pages before exploring further.
# Sign Message
> This content applies to WaaS 1.0 only. We highly recommend that you upgrade to [WaaS 2.0](https://www.cobo.com/developers/v2/guides/overview/introduction). Sign Message
This API is only intended for MPC web3 wallets and does not support MPC send/receive wallets.
Users can use [mpc\_sign\_messages\_by\_cobo\_ids](/v1/api-references/mpc-wallet/mpc_sign_messages_by_cobo_ids) and
[mpc\_sign\_messages\_by\_request\_ids](/v1/api-references/mpc-wallet/mpc_sign_messages_by_request_ids) to query details of signed messages.
#### Request
chain code
Withdraw request ID (Universally unique ID for each user's withdraw request and less than or equal to 120 characters)
source address
sign version, EIP-191: 1 , EIP-712: 2
EIP-191:
* message: Base64 encode of the original message
```python Sample theme={null}
extra_parameters: '{"message": "YWFhYQ=="}'
```
EIP-712:
* structured\_data: Json of EIP-712 structured data, please refer to [https://eips.ethereum.org/EIPS/eip-712](https://eips.ethereum.org/EIPS/eip-712) for EIP-712 info
```python Sample theme={null}
"extra_parameters": '{"structured_data": "{\\"types\\":{\\"EIP712Domain\\":[{\\"name\\":\\"name\\",\\"type\\":\\"string\\"},{\\"name\\":\\"version\\",\\"type\\":\\"string\\"},{\\"name\\":\\"chainId\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"verifyingContract\\",\\"type\\":\\"address\\"}],\\"OrderComponents\\":[{\\"name\\":\\"offerer\\",\\"type\\":\\"address\\"},{\\"name\\":\\"zone\\",\\"type\\":\\"address\\"},{\\"name\\":\\"offer\\",\\"type\\":\\"OfferItem[]\\"},{\\"name\\":\\"consideration\\",\\"type\\":\\"ConsiderationItem[]\\"},{\\"name\\":\\"orderType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"startTime\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endTime\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"zoneHash\\",\\"type\\":\\"bytes32\\"},{\\"name\\":\\"salt\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"conduitKey\\",\\"type\\":\\"bytes32\\"},{\\"name\\":\\"counter\\",\\"type\\":\\"uint256\\"}],\\"OfferItem\\":[{\\"name\\":\\"itemType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"token\\",\\"type\\":\\"address\\"},{\\"name\\":\\"identifierOrCriteria\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"startAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endAmount\\",\\"type\\":\\"uint256\\"}],\\"ConsiderationItem\\":[{\\"name\\":\\"itemType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"token\\",\\"type\\":\\"address\\"},{\\"name\\":\\"identifierOrCriteria\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"startAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"recipient\\",\\"type\\":\\"address\\"}]},\\"primaryType\\":\\"OrderComponents\\",\\"domain\\":{\\"name\\":\\"Seaport\\",\\"version\\":\\"1.4\\",\\"chainId\\":\\"5\\",\\"verifyingContract\\":\\"0x00000000000001ad428e4906aE43D8F9852d0dD6\\"},\\"message\\":{\\"offerer\\":\\"0x05ABA2d0A0f551E10e2E74489268206545e8C460\\",\\"offer\\":[{\\"itemType\\":\\"3\\",\\"token\\":\\"0x357Fd2942e8Ee435D7D21859ECAe99Bd597D8779\\",\\"identifierOrCriteria\\":\\"200\\",\\"startAmount\\":\\"1\\",\\"endAmount\\":\\"1\\"}],\\"consideration\\":[{\\"itemType\\":\\"0\\",\\"token\\":\\"0x0000000000000000000000000000000000000000\\",\\"identifierOrCriteria\\":\\"0\\",\\"startAmount\\":\\"9750000000000\\",\\"endAmount\\":\\"9750000000000\\",\\"recipient\\":\\"0x05ABA2d0A0f551E10e2E74489268206545e8C460\\"},{\\"itemType\\":\\"0\\",\\"token\\":\\"0x0000000000000000000000000000000000000000\\",\\"identifierOrCriteria\\":\\"0\\",\\"startAmount\\":\\"250000000000\\",\\"endAmount\\":\\"250000000000\\",\\"recipient\\":\\"0x0000a26b00c1F0DF003000390027140000fAa719\\"}],\\"startTime\\":\\"1681126098\\",\\"endTime\\":\\"1683718098\\",\\"orderType\\":\\"1\\",\\"zone\\":\\"0x004C00500000aD104D7DBd00e3ae0A5C00560C00\\",\\"zoneHash\\":\\"0x0000000000000000000000000000000000000000000000000000000000000000\\",\\"salt\\":\\"24446860302761739304752683030156737591518664810215442929808540646255434554088\\",\\"conduitKey\\":\\"0x0000007b02230091a7ed01230072f7006a004d60a8d4e71d599b8104250f0000\\",\\"totalOriginalConsiderationItems\\":\\"2\\",\\"counter\\":\\"0\\"}}"}'
```
#### Response
request successful or failed
Unique transaction ID
```python Python theme={null}
request(
"POST",
"/v1/custody/mpc/sign_message/",
{
"chain_code": "ETH",
"request_id": "1671699717647",
"from_address": "0xe0cc496b3d9b0f8019b678066b9db81261d827bc",
"sign_version": 2,
"extra_parameters": '{"structured_data": "{\\"types\\":{\\"EIP712Domain\\":[{\\"name\\":\\"name\\",\\"type\\":\\"string\\"},{\\"name\\":\\"version\\",\\"type\\":\\"string\\"},{\\"name\\":\\"chainId\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"verifyingContract\\",\\"type\\":\\"address\\"}],\\"OrderComponents\\":[{\\"name\\":\\"offerer\\",\\"type\\":\\"address\\"},{\\"name\\":\\"zone\\",\\"type\\":\\"address\\"},{\\"name\\":\\"offer\\",\\"type\\":\\"OfferItem[]\\"},{\\"name\\":\\"consideration\\",\\"type\\":\\"ConsiderationItem[]\\"},{\\"name\\":\\"orderType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"startTime\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endTime\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"zoneHash\\",\\"type\\":\\"bytes32\\"},{\\"name\\":\\"salt\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"conduitKey\\",\\"type\\":\\"bytes32\\"},{\\"name\\":\\"counter\\",\\"type\\":\\"uint256\\"}],\\"OfferItem\\":[{\\"name\\":\\"itemType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"token\\",\\"type\\":\\"address\\"},{\\"name\\":\\"identifierOrCriteria\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"startAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endAmount\\",\\"type\\":\\"uint256\\"}],\\"ConsiderationItem\\":[{\\"name\\":\\"itemType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"token\\",\\"type\\":\\"address\\"},{\\"name\\":\\"identifierOrCriteria\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"startAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"recipient\\",\\"type\\":\\"address\\"}]},\\"primaryType\\":\\"OrderComponents\\",\\"domain\\":{\\"name\\":\\"Seaport\\",\\"version\\":\\"1.4\\",\\"chainId\\":\\"5\\",\\"verifyingContract\\":\\"0x00000000000001ad428e4906aE43D8F9852d0dD6\\"},\\"message\\":{\\"offerer\\":\\"0x05ABA2d0A0f551E10e2E74489268206545e8C460\\",\\"offer\\":[{\\"itemType\\":\\"3\\",\\"token\\":\\"0x357Fd2942e8Ee435D7D21859ECAe99Bd597D8779\\",\\"identifierOrCriteria\\":\\"200\\",\\"startAmount\\":\\"1\\",\\"endAmount\\":\\"1\\"}],\\"consideration\\":[{\\"itemType\\":\\"0\\",\\"token\\":\\"0x0000000000000000000000000000000000000000\\",\\"identifierOrCriteria\\":\\"0\\",\\"startAmount\\":\\"9750000000000\\",\\"endAmount\\":\\"9750000000000\\",\\"recipient\\":\\"0x05ABA2d0A0f551E10e2E74489268206545e8C460\\"},{\\"itemType\\":\\"0\\",\\"token\\":\\"0x0000000000000000000000000000000000000000\\",\\"identifierOrCriteria\\":\\"0\\",\\"startAmount\\":\\"250000000000\\",\\"endAmount\\":\\"250000000000\\",\\"recipient\\":\\"0x0000a26b00c1F0DF003000390027140000fAa719\\"}],\\"startTime\\":\\"1681126098\\",\\"endTime\\":\\"1683718098\\",\\"orderType\\":\\"1\\",\\"zone\\":\\"0x004C00500000aD104D7DBd00e3ae0A5C00560C00\\",\\"zoneHash\\":\\"0x0000000000000000000000000000000000000000000000000000000000000000\\",\\"salt\\":\\"24446860302761739304752683030156737591518664810215442929808540646255434554088\\",\\"conduitKey\\":\\"0x0000007b02230091a7ed01230072f7006a004d60a8d4e71d599b8104250f0000\\",\\"totalOriginalConsiderationItems\\":\\"2\\",\\"counter\\":\\"0\\"}}"}'
},
api_key, api_secret, host
)
```
```javascript JavaScript theme={null}
coboFetch("POST", "/v1/custody/mpc/sign_message/", {
"chain_code": "ETH",
"request_id": "1671699717647",
"from_address": "0xe0cc496b3d9b0f8019b678066b9db81261d827bc",
"sign_version": 2,
"extra_parameters": '{"structured_data": "{\\"types\\":{\\"EIP712Domain\\":[{\\"name\\":\\"name\\",\\"type\\":\\"string\\"},{\\"name\\":\\"version\\",\\"type\\":\\"string\\"},{\\"name\\":\\"chainId\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"verifyingContract\\",\\"type\\":\\"address\\"}],\\"OrderComponents\\":[{\\"name\\":\\"offerer\\",\\"type\\":\\"address\\"},{\\"name\\":\\"zone\\",\\"type\\":\\"address\\"},{\\"name\\":\\"offer\\",\\"type\\":\\"OfferItem[]\\"},{\\"name\\":\\"consideration\\",\\"type\\":\\"ConsiderationItem[]\\"},{\\"name\\":\\"orderType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"startTime\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endTime\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"zoneHash\\",\\"type\\":\\"bytes32\\"},{\\"name\\":\\"salt\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"conduitKey\\",\\"type\\":\\"bytes32\\"},{\\"name\\":\\"counter\\",\\"type\\":\\"uint256\\"}],\\"OfferItem\\":[{\\"name\\":\\"itemType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"token\\",\\"type\\":\\"address\\"},{\\"name\\":\\"identifierOrCriteria\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"startAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endAmount\\",\\"type\\":\\"uint256\\"}],\\"ConsiderationItem\\":[{\\"name\\":\\"itemType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"token\\",\\"type\\":\\"address\\"},{\\"name\\":\\"identifierOrCriteria\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"startAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"recipient\\",\\"type\\":\\"address\\"}]},\\"primaryType\\":\\"OrderComponents\\",\\"domain\\":{\\"name\\":\\"Seaport\\",\\"version\\":\\"1.4\\",\\"chainId\\":\\"5\\",\\"verifyingContract\\":\\"0x00000000000001ad428e4906aE43D8F9852d0dD6\\"},\\"message\\":{\\"offerer\\":\\"0x05ABA2d0A0f551E10e2E74489268206545e8C460\\",\\"offer\\":[{\\"itemType\\":\\"3\\",\\"token\\":\\"0x357Fd2942e8Ee435D7D21859ECAe99Bd597D8779\\",\\"identifierOrCriteria\\":\\"200\\",\\"startAmount\\":\\"1\\",\\"endAmount\\":\\"1\\"}],\\"consideration\\":[{\\"itemType\\":\\"0\\",\\"token\\":\\"0x0000000000000000000000000000000000000000\\",\\"identifierOrCriteria\\":\\"0\\",\\"startAmount\\":\\"9750000000000\\",\\"endAmount\\":\\"9750000000000\\",\\"recipient\\":\\"0x05ABA2d0A0f551E10e2E74489268206545e8C460\\"},{\\"itemType\\":\\"0\\",\\"token\\":\\"0x0000000000000000000000000000000000000000\\",\\"identifierOrCriteria\\":\\"0\\",\\"startAmount\\":\\"250000000000\\",\\"endAmount\\":\\"250000000000\\",\\"recipient\\":\\"0x0000a26b00c1F0DF003000390027140000fAa719\\"}],\\"startTime\\":\\"1681126098\\",\\"endTime\\":\\"1683718098\\",\\"orderType\\":\\"1\\",\\"zone\\":\\"0x004C00500000aD104D7DBd00e3ae0A5C00560C00\\",\\"zoneHash\\":\\"0x0000000000000000000000000000000000000000000000000000000000000000\\",\\"salt\\":\\"24446860302761739304752683030156737591518664810215442929808540646255434554088\\",\\"conduitKey\\":\\"0x0000007b02230091a7ed01230072f7006a004d60a8d4e71d599b8104250f0000\\",\\"totalOriginalConsiderationItems\\":\\"2\\",\\"counter\\":\\"0\\"}}"}'
}, api_key, api_secret, host)
.then(res => {
res.json().then((data)=>{
console.log(JSON.stringify(data, null, 4));
})
}).catch(err => {
console.log(err)
});
```
```go Go theme={null}
Request("POST", "/v1/custody/mpc/sign_message/", map[string]string{
"chain_code": "ETH",
"request_id": "1671699717647",
"from_address": "0xe0cc496b3d9b0f8019b678066b9db81261d827bc",
"sign_version": 2,
"extra_parameters": '{"structured_data": "{\\"types\\":{\\"EIP712Domain\\":[{\\"name\\":\\"name\\",\\"type\\":\\"string\\"},{\\"name\\":\\"version\\",\\"type\\":\\"string\\"},{\\"name\\":\\"chainId\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"verifyingContract\\",\\"type\\":\\"address\\"}],\\"OrderComponents\\":[{\\"name\\":\\"offerer\\",\\"type\\":\\"address\\"},{\\"name\\":\\"zone\\",\\"type\\":\\"address\\"},{\\"name\\":\\"offer\\",\\"type\\":\\"OfferItem[]\\"},{\\"name\\":\\"consideration\\",\\"type\\":\\"ConsiderationItem[]\\"},{\\"name\\":\\"orderType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"startTime\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endTime\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"zoneHash\\",\\"type\\":\\"bytes32\\"},{\\"name\\":\\"salt\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"conduitKey\\",\\"type\\":\\"bytes32\\"},{\\"name\\":\\"counter\\",\\"type\\":\\"uint256\\"}],\\"OfferItem\\":[{\\"name\\":\\"itemType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"token\\",\\"type\\":\\"address\\"},{\\"name\\":\\"identifierOrCriteria\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"startAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endAmount\\",\\"type\\":\\"uint256\\"}],\\"ConsiderationItem\\":[{\\"name\\":\\"itemType\\",\\"type\\":\\"uint8\\"},{\\"name\\":\\"token\\",\\"type\\":\\"address\\"},{\\"name\\":\\"identifierOrCriteria\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"startAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"endAmount\\",\\"type\\":\\"uint256\\"},{\\"name\\":\\"recipient\\",\\"type\\":\\"address\\"}]},\\"primaryType\\":\\"OrderComponents\\",\\"domain\\":{\\"name\\":\\"Seaport\\",\\"version\\":\\"1.4\\",\\"chainId\\":\\"5\\",\\"verifyingContract\\":\\"0x00000000000001ad428e4906aE43D8F9852d0dD6\\"},\\"message\\":{\\"offerer\\":\\"0x05ABA2d0A0f551E10e2E74489268206545e8C460\\",\\"offer\\":[{\\"itemType\\":\\"3\\",\\"token\\":\\"0x357Fd2942e8Ee435D7D21859ECAe99Bd597D8779\\",\\"identifierOrCriteria\\":\\"200\\",\\"startAmount\\":\\"1\\",\\"endAmount\\":\\"1\\"}],\\"consideration\\":[{\\"itemType\\":\\"0\\",\\"token\\":\\"0x0000000000000000000000000000000000000000\\",\\"identifierOrCriteria\\":\\"0\\",\\"startAmount\\":\\"9750000000000\\",\\"endAmount\\":\\"9750000000000\\",\\"recipient\\":\\"0x05ABA2d0A0f551E10e2E74489268206545e8C460\\"},{\\"itemType\\":\\"0\\",\\"token\\":\\"0x0000000000000000000000000000000000000000\\",\\"identifierOrCriteria\\":\\"0\\",\\"startAmount\\":\\"250000000000\\",\\"endAmount\\":\\"250000000000\\",\\"recipient\\":\\"0x0000a26b00c1F0DF003000390027140000fAa719\\"}],\\"startTime\\":\\"1681126098\\",\\"endTime\\":\\"1683718098\\",\\"orderType\\":\\"1\\",\\"zone\\":\\"0x004C00500000aD104D7DBd00e3ae0A5C00560C00\\",\\"zoneHash\\":\\"0x0000000000000000000000000000000000000000000000000000000000000000\\",\\"salt\\":\\"24446860302761739304752683030156737591518664810215442929808540646255434554088\\",\\"conduitKey\\":\\"0x0000007b02230091a7ed01230072f7006a004d60a8d4e71d599b8104250f0000\\",\\"totalOriginalConsiderationItems\\":\\"2\\",\\"counter\\":\\"0\\"}}"}'
})
```
```json theme={null}
{
"success": true,
"result": {
"cobo_id": "20221227195133000378036000001822"
}
}
```