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Transaction

Signs an unsigned transaction and broadcasts it to chain.
FieldDescriptionType - Optional
kindTransactionString
transactionThe unsigned hex encoded transaction as shown below.String
externalIdA unique ID from your system. It can be leveraged to be used as an idempotency key (read more here).String (optional)
{
  "kind": "Transaction",
  "transaction": "0xc5510ac408dcb78034b4fdcdaea6582c10f2e0d03dc684d32f9457b9d778e113020000000000000002000000000000000000000000000000000000000000000000000000000000000104636f696e087472616e73666572010700000000000000000000000000000000000000000000000000000000000000010a6170746f735f636f696e094170746f73436f696e0002205bdc24cb9033286ffe19f436145b9e2267dd03b0fd0d422459d381a6431d39ba080100000000000000400d0300000000006400000000000000cce1f2670000000002"
}

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Typescript Example with Aptos SDK

First install the Aptos Typescript SDK. You can find the full documentation here. Here a code sample to broadcast a transaction via the Dfns TypeScript SDK: 
import {
  Aptos, 
  APTOS_COIN, 
  AptosConfig, 
  MimeType, 
  Network, 
  PendingTransactionResponse, 
  postAptosFullNode
} from '@aptos-labs/ts-sdk'


const walletId = 'wa-6lbfv-9esgj-88s80c0qsih0a393'
const wallet = await dfnsClient.wallets.getWallet({ walletId })

const myAddress = new PublicKey(wallet.address)
const toAddress = new PublicKey('0x5bdc24cb9033286ffe19f436145b9e2267dd03b0fd0d422459d381a6431d39ba')

const aptosConfig = new AptosConfig({
    network: Network.TESTNET,
  })
const client = new Aptos(aptosConfig)

const transaction = await client.transaction.build.simple({
    sender: wallet.address,
    data: {
      function: '0x1::coin::transfer',
      typeArguments: [APTOS_COIN],
      functionArguments: [
        "0x5bdc24cb9033286ffe19f436145b9e2267dd03b0fd0d422459d381a6431d39ba",
        "1",
      ],
    },
  })

const res = await dfnsClient.wallets.broadcastTransaction({
  walletId,
  body: {
    kind: 'Transaction',
    transaction: transaction.bcsToHex().toString(),
  },
})