> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dynamic.xyz/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# signPsbts

# signPsbts

Signs multiple Partially Signed Bitcoin Transactions (PSBTs) in a single operation. This is useful for batch operations or when working with multiple transactions that need to be signed together.

## Usage

```javascript theme={"system"}
import { signPsbts, isBitcoinWalletAccount } from "@dynamic-labs-sdk/bitcoin";
import { getPrimaryWalletAccount } from "@dynamic-labs-sdk/client";

const walletAccount = getPrimaryWalletAccount();

if (walletAccount && isBitcoinWalletAccount(walletAccount)) {
  const { signedPsbts } = await signPsbts({
    walletAccount,
    requests: [
      {
        unsignedPsbtBase64: "cHNidP8BAH...",
        allowedSighash: [1],
        signature: [
          {
            address: walletAccount.address,
            signingIndexes: [0],
          },
        ],
      },
      {
        unsignedPsbtBase64: "cHNidP8BAI...",
        allowedSighash: [1],
        signature: [
          {
            address: walletAccount.address,
            signingIndexes: [0, 1],
          },
        ],
      },
    ],
  });

  console.log("Signed PSBTs:", signedPsbts);
}
```

## Parameters

| Parameter                       | Type                       | Description                                                             |
| ------------------------------- | -------------------------- | ----------------------------------------------------------------------- |
| `requests`                      | `BitcoinSignPsbtRequest[]` | Array of PSBT signing requests                                          |
| `requests[].unsignedPsbtBase64` | `string`                   | The unsigned PSBT encoded in Base64                                     |
| `requests[].allowedSighash`     | `number[]`                 | Array of allowed signature hash types                                   |
| `requests[].signature`          | `Array` (optional)         | Array of signature configuration objects                                |
| `walletAccount`                 | `BitcoinWalletAccount`     | The wallet account to sign with                                         |
| `client`                        | `DynamicClient` (optional) | The Dynamic client instance. Only required when using multiple clients. |

## Returns

`Promise<{ signedPsbts: string[] }>` - A promise that resolves to an object containing an array of signed PSBTs in Base64 format.

## Errors

| Error                     | Description                                                       |
| ------------------------- | ----------------------------------------------------------------- |
| `NotBitcoinProviderError` | Thrown if the wallet account's provider is not a Bitcoin provider |

## Related functions

* [signPsbt](/javascript/reference/bitcoin/sign-psbt) - Sign a single PSBT
* [sendBitcoin](/javascript/reference/bitcoin/send-bitcoin) - Send a simple Bitcoin transaction