> For the complete documentation index, see [llms.txt](https://docs.unix.market/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.unix.market/authentication/signing-method-b-typed-data.md).

# Signing Method B — Typed Data

Method B signs an operation-specific EIP-712 struct directly. It does not compute `actionHash`, does not use an Action Tag, and does not use `target_address`.

Method B is used for Agent management and sub-account creation.

## Method B Endpoints

| Endpoint                         | Action             |
| -------------------------------- | ------------------ |
| `POST /v1/account/approve-agent` | Approve Agent Key  |
| `POST /v1/account/revoke-agent`  | Revoke Agent Key   |
| `POST /v1/account/renew-agent`   | Renew Agent Key    |
| `POST /v1/account/create-sub`    | Create sub-account |

All other write endpoints use [Signing Method A](broken://pages/3b457b2c7c07361c47d7e076750634c56318fe7f).

## Difference From Method A

| Aspect                 | Method A                                                     | Method B                  |
| ---------------------- | ------------------------------------------------------------ | ------------------------- |
| Signed struct          | `Agent(...)` wrapper                                         | Operation-specific struct |
| `actionHash`           | Required                                                     | Not used                  |
| Action Tag             | Required                                                     | Not used                  |
| `target_address`       | Supported by the `Agent` wrapper                             | Not used                  |
| EIP-712 Domain         | Same                                                         | Same                      |
| `signing_hash` formula | `keccak256(concat("\x19\x01", domainSeparator, structHash))` | Same                      |
| `tx_hash`              | `signing_hash`                                               | `signing_hash`            |

## EIP-712 Domain

```json
{
  "name": "UniX",
  "version": "1",
  "chainId": 1,
  "verifyingContract": "0x0000000000000000000000000000000000000000"
}
```

Domain type:

```
EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)
```

## Typed Data Definitions

### ApproveAgent

```
ApproveAgent(address signerAddress,address agentAddress,address authorizedAddress,uint32 validDays,string label,uint64 nonce,uint64 expiresAfter)
```

| EIP-712 field       | Type      | Source                             |
| ------------------- | --------- | ---------------------------------- |
| `signerAddress`     | `address` | HTTP `signer_address`              |
| `agentAddress`      | `address` | Request field `agent_address`      |
| `authorizedAddress` | `address` | Request field `authorized_address` |
| `validDays`         | `uint32`  | Request field `valid_days`         |
| `label`             | `string`  | Request field `label`              |
| `nonce`             | `uint64`  | HTTP `nonce`                       |
| `expiresAfter`      | `uint64`  | HTTP `expires_after`               |

### RevokeAgent

```
RevokeAgent(address signerAddress,address agentAddress,uint64 nonce,uint64 expiresAfter)
```

| EIP-712 field   | Type      | Source                        |
| --------------- | --------- | ----------------------------- |
| `signerAddress` | `address` | HTTP `signer_address`         |
| `agentAddress`  | `address` | Request field `agent_address` |
| `nonce`         | `uint64`  | HTTP `nonce`                  |
| `expiresAfter`  | `uint64`  | HTTP `expires_after`          |

### RenewAgent

```
RenewAgent(address signerAddress,address agentAddress,uint32 validDays,uint64 nonce,uint64 expiresAfter)
```

| EIP-712 field   | Type      | Source                        |
| --------------- | --------- | ----------------------------- |
| `signerAddress` | `address` | HTTP `signer_address`         |
| `agentAddress`  | `address` | Request field `agent_address` |
| `validDays`     | `uint32`  | Request field `valid_days`    |
| `nonce`         | `uint64`  | HTTP `nonce`                  |
| `expiresAfter`  | `uint64`  | HTTP `expires_after`          |

### CreateSubAccount

```
CreateSubAccount(address signerAddress,string label,uint64 nonce,uint64 expiresAfter)
```

| EIP-712 field   | Type      | Source                |
| --------------- | --------- | --------------------- |
| `signerAddress` | `address` | HTTP `signer_address` |
| `label`         | `string`  | Request field `label` |
| `nonce`         | `uint64`  | HTTP `nonce`          |
| `expiresAfter`  | `uint64`  | HTTP `expires_after`  |

## Encoding

`structHash` follows standard EIP-712 struct encoding:

```
typeHash = keccak256(encodeType)
structHash = keccak256(concat(typeHash, encoded_field_1, encoded_field_2, ...))
signing_hash = keccak256(concat("\x19\x01", domainSeparator, structHash))
```

Field order must match the type string exactly.

| Type      | Encoding                                |
| --------- | --------------------------------------- |
| `address` | 20-byte address left-padded to 32 bytes |
| `uint32`  | Value left-padded to 32 bytes           |
| `uint64`  | Value left-padded to 32 bytes           |
| `string`  | `keccak256(utf8_bytes(value))`          |

## Example — Approve Agent Key

```python
import time, requests
from eth_account import Account
from eth_account.messages import encode_typed_data

nonce = int(time.time() * 1000)
expires_after = nonce + 600_000

domain = {
    "name": "UniX",
    "version": "1",
    "chainId": 1,
    "verifyingContract": "0x0000000000000000000000000000000000000000",
}
types = {"ApproveAgent": [
    {"name": "signerAddress", "type": "address"},
    {"name": "agentAddress", "type": "address"},
    {"name": "authorizedAddress", "type": "address"},
    {"name": "validDays", "type": "uint32"},
    {"name": "label", "type": "string"},
    {"name": "nonce", "type": "uint64"},
    {"name": "expiresAfter", "type": "uint64"},
]}
message = {
    "signerAddress": "0xYOUR_ADDRESS",
    "agentAddress": "0xAGENT_ADDRESS",
    "authorizedAddress": "0xYOUR_ADDRESS",
    "validDays": 30,
    "label": "mm-bot-prod",
    "nonce": nonce,
    "expiresAfter": expires_after,
}

signed = Account.sign_message(
    encode_typed_data(domain, types, "ApproveAgent", message),
    private_key="0xYOUR_PRIVATE_KEY",
)

resp = requests.post("https://api.unixtrade.pro/v1/account/approve-agent", json={
    "agent_address": "0xAGENT_ADDRESS",
    "authorized_address": "0xYOUR_ADDRESS",
    "valid_days": 30,
    "label": "mm-bot-prod",
    "signer_address": "0xYOUR_ADDRESS",
    "nonce": nonce,
    "expires_after": expires_after,
    "signature": {"r": hex(signed.r), "s": hex(signed.s), "v": signed.v},
})
print(resp.json())
```

The node recomputes the typed struct, recovers the signer with `ecrecover`, and rejects the request unless the recovered address equals `signer_address`.


---

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