# Solana

## Transaction

Signs an unsigned transaction and broadcasts it to chain.

| Field         | Description                                                                                                                                   | Type - Optional     |
| ------------- | --------------------------------------------------------------------------------------------------------------------------------------------- | ------------------- |
| `kind`        | `Transaction`                                                                                                                                 | String              |
| `transaction` | The unsigned hex encoded transaction as shown below                                                                                           | String              |
| `externalId`  | A unique ID from your system. It can be leveraged to be used as an idempotency key (read more [here](/d/advanced-topics/api-idempotency.md)). | String *(optional)* |

```json
{
  "kind": "Transaction",
  "transaction": "0x01000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008001000103b25c8c464080ab2835a166d2b3f13195c2ff3c8f281c7ebe492f0d45d830ff4824a8b38a94b73d2756f2be68655a49706be9b1dc900978984d6eeaf65ab62e900000000000000000000000000000000000000000000000000000000000000000280c73cfb9caeb41b8508d20057917b568ac1f5a4175b5befa94532b3fd0b92e01020200010c02000000010000000000000000"
}
```

{% hint style="info" %}
Solana web3.js expects the serialized transaction to include 0-padded placeholder signatures, otherwise deserialization will failed. If you are using a different library to construct the serialized transaction, such as the Go SDK, please make sure to include the placeholder signatures.
{% endhint %}

### Typescript Example with Solana web3.js <a href="#typescript-example" id="typescript-example"></a>

First install the Solana web3.js SDK. You can find the full documentation here: <https://docs.solana.com/developing/clients/javascript-api>

Here a code sample to broadcast a transaction via [the Dfns TypeScript SDK](https://github.com/dfns/dfns-sdk-ts):

```typescript
import {
  clusterApiUrl,
  Connection,
  PublicKey,
  SystemProgram,
  TransactionMessage,
  VersionedTransaction,
} from '@solana/web3.js'

const walletId = 'wa-6lbfv-9esgj-xxxxxxxxxxxxxxxx'
const wallet = await dfnsClient.wallets.getWallet({ walletId })

const myAddress = new PublicKey(wallet.address)
const toAddress = new PublicKey('3U6stgsD1FmA7o3omUguritCU8iWmUM7Rs6KqAHHxHVZ')

const connection = new Connection(clusterApiUrl('devnet'), 'confirmed')
const latestBlockhash = await connection.getLatestBlockhash()

const message = new TransactionMessage({
  payerKey: myAddress,
  recentBlockhash: latestBlockhash.blockhash,
  instructions: [
    SystemProgram.transfer({
      fromPubkey: myAddress,
      toPubkey: toAddress,
      lamports: 1n,
    }),
  ],
}).compileToV0Message()
const transaction = new VersionedTransaction(message)

const res = await dfnsClient.wallets.broadcastTransaction({
  walletId,
  body: {
    kind: 'Transaction',
    transaction: `0x${Buffer.from(transaction.serialize()).toString('hex')}`,
  },
})
```


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