> For the complete documentation index, see [llms.txt](https://support.backpack.exchange/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.backpack.exchange/support-docs/cn/qian-bao/ji-shu-wen-dang/deeplinks/provider-fang-fa/signtransaction-qian-ming-dan-bi-jiao-yi.md).

# SignTransaction（签名单笔交易）

[SignAndSendTransaction ](/support-docs/cn/qian-bao/ji-shu-wen-dang/deeplinks/provider-fang-fa/signandsendtransaction-qian-ming-bing-fa-song-jiao-yi.md)是发送交易最简单且推荐的方法。Backpack 会在签名后立即提交交易，这对用户来说更安全，同时为开发者提供更简洁的 API。

不过，应用也可以仅请求 Backpack 提供交易签名。

签名完成后，应用可使用 [web3.js ](https://solana-labs.github.io/solana-web3.js/classes/Connection.html#sendRawTransaction)的 `sendRawTransaction` 方法自行提交交易。

## **基础 URL**

```
https://backpack.app/ul/v1/signTransaction
```

## **查询字符串参数**

* `dapp_encryption_public_key`（必填）：应用端用于当前[connect](/support-docs/cn/qian-bao/ji-shu-wen-dang/deeplinks/provider-fang-fa/connect-lian-jie.md)（连接）会话的原始加密公钥。
* `nonce`（必填）：用于加密请求的 base58 编码随机数。
* `redirect_link`（必填）：操作完成后，Backpack 应将用户重定向至该 URI。请参阅[Specifying Redirects](/support-docs/cn/qian-bao/ji-shu-wen-dang/deeplinks/specifying-redirects-zhi-ding-zhong-ding-xiang.md)了解更多信息。需进行 URL 编码。
* `payload`（必填）：加密的 JSON 字符串，包含以下字段：

```json
{
  "transaction": "...", // 序列化交易，base58 编码
  "session": "...",     // 来自 connect 方法的 token
}
```

* `transaction` (必填)：Backpack 将要签名的[transaction](https://solana-labs.github.io/solana-web3.js/classes/Transaction.html)（交易），已进行序列化并使用 base58 编码。
* `session`（必填）：来自 [Connect](/support-docs/cn/qian-bao/ji-shu-wen-dang/deeplinks/provider-fang-fa/connect-lian-jie.md) 方法的会话 token。详见[Handling Sessions](/support-docs/cn/qian-bao/ji-shu-wen-dang/deeplinks/handling-sessions-hui-hua-chu-li.md)。

## **返回值**

### Approve（同意）

* `nonce`：用于加密响应的 base58 编码随机数。
* `data`：加密的 JSON 字符串。请参考[Encryption](/support-docs/cn/qian-bao/ji-shu-wen-dang/deeplinks/encryption-jia-mi-ji-zhi.md)部分了解如何通过共享密钥解密。加密内容以 base58 编码。

```json
// 解密后的 `data` 参数内容
{
  transaction: "...", // 已签名的序列化交易，base58 编码
}
```

**`transaction`**：已签名、序列化并以 base58 编码的交易。Backpack 不会提交此交易。应用程序可以通过 [web3.js ](https://solana-labs.github.io/solana-web3.js/classes/Connection.html#sendRawTransaction)的 `sendRawTransaction` 方法提交此交易。

### Reject（拒绝）

错误情况会以 `errorCode` 和 `errorMessage` 作为查询参数返回。

请参阅[ Errors ](/support-docs/cn/qian-bao/ji-shu-wen-dang/deeplinks/limitations-xian-zhi.md#errors-cuo-wu-chu-li)了解所有可能的错误代码。

```json
{
  "errorCode": "...",
  "errorMessage": "..."
}
```


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