# UpdateAccount with custom seed

The eddsaKey is generated by a keyseed, default format is `Sign this message to access Loopring Exchange: %s with key nonce: %d` 

* %s is [exchange address](https://docs-uat.loopring.io/en/dex_apis/getExchangeInfo.html)
* %d is nonce in [Get api/v3/account](https://docs-uat.loopring.io/en/dex_apis/getAccount.html)

For example:

```
Sign this message to access Loopring Exchange: 0x2e76EBd1c7c0C8e7c2B875b6d505a260C525d25e with key nonce: 0
```

We also support custom keyseed when `updateAccount`.

For example, you can change the string before 'with key nonce: 0' (must end with 'with key nonce: %d')

```
Sign this message to access XXX website with key nonce: 0
```

### 1. Update Account with keySeed

POST api: [api/v3/account](https://docs-uat.loopring.io/en/dex_apis/submitUpdateAccount.html)

Note: after `updateAccount`, the nonce in [Get api/v3/account](https://docs-uat.loopring.io/en/dex_apis/getAccount.html) will be incremented by 1

```
header: 
X-API-SIG = 0x05b49f99ac6d8f67d4519dfaf9b545dbc775dcc837441f85ef9aae74c83e5c2d700729cdba1d7a9cc818abb43a598cf1e4eeca547e4e6697ff18c4d2ac111ac21b03

request:
{
	"accountId": 11329,
	"ecdsaSignature": "0x05b49f99ac6d8f67d4519dfaf9b545dbc775dcc837441f85ef9aae74c83e5c2d700729cdba1d7a9cc818abb43a598cf1e4eeca547e4e6697ff18c4d2ac111ac21b03",
	"exchange": "0x2e76EBd1c7c0C8e7c2B875b6d505a260C525d25e",
	"maxFee": {
		"volume": "24000000000000",
		"tokenId": 0
	},
	"nonce": 0,
	"owner": "0x8656920c85342d646E5286Cb841F90209272ABeb",
	"publicKey": {
		"x": "0x20ba7bd404f259c3d49853d6a849425a983c24fc3c01be177f719e84ba776a8c",
		"y": "0x266d7e40dba375c90816287814f20b8e187227a6d05f17d2d329fefac9b782af"
	},
	"validUntil": 1899273791,
	"keySeed":"Sign this message to access Loopring Exchange: 0x2e76EBd1c7c0C8e7c2B875b6d505a260C525d25e with key nonce: 0"
}

response:
{
	"hash": "0x1d01dd0f4d7846a90235331798f4457829e72d8a4ed8d9393dd29c4859481e7b",
	"status": "processing",
	"isIdempotent": false
}
```

{% hint style="info" %}
Please also refer to js sdk for updateAccount: <https://github.com/Loopring/loopring\\_sdk/blob/master/src/tests/user.test.ts#L219>
{% endhint %}

### 2. Get Account

Get API: [api/v3/account](https://docs-uat.loopring.io/en/dex_apis/getAccount.html)

```
https://uat2.loopring.io/api/v3/account?owner=0x8656920c85342d646E5286Cb841F90209272ABeb

respone:
{
	"accountId": 11329,
	"owner": "0x8656920c85342d646E5286Cb841F90209272ABeb",
	"frozen": false,
	"publicKey": {
		"x": "0x20ba7bd404f259c3d49853d6a849425a983c24fc3c01be177f719e84ba776a8c",
		"y": "0x266d7e40dba375c90816287814f20b8e187227a6d05f17d2d329fefac9b782af"
	},
	"tags": "",
	"nonce": 1,
	"keyNonce": 1,
	"keySeed": "Sign this message to access Loopring Exchange: 0x2e76EBd1c7c0C8e7c2B875b6d505a260C525d25e with key nonce: 0"
}
```

Then use the keySeed to generate eddsaKey.

{% hint style="info" %}
Please refer to js sdk for generating EdDSA keypair: <https://github.com/Loopring/loopring\\_sdk/blob/master/src/api/sign/sign\\_tools.ts#L70>
{% endhint %}


---

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```
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```

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