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Hedera supports the following signature kinds:
  • Transaction, unsigned Hedera or EVM transaction.

​
Transaction

Signs an unsigned transaction.
FieldDescriptionType - Optional
blockchainKindHederaString
kindTransactionString
transactionThe unsigned hex encoded transaction as shown below.String
 
{
  "blockchainKind": "Hedera",
  "kind": "Transaction",
  "transaction": "0x0a6c2a6a0a660a1a0a0b08f6f89fc80610ecf1bf1912090800100018c7b1a303180012060800100018051880c2d72f22020878320072350a330a200a1a0800100022140c78f5e80fe0107ba1ab52048b4b2053ee948611100218000a0f0a090800100018c7b1a303100118001200"
}

​
Typescript Example with Hiero JavaScript SDK

First install the Hiero JavaScript SDK. You can find the full documentation here: https://github.com/hiero-ledger/hiero-sdk-js Here a code sample to generate a signature via the Dfns TypeScript SDK: 
import { Hbar, TransferTransaction } from '@hashgraph/sdk'

const walletId = 'wa-172um-hgi5f-xxxxxxxxxxxxxxxx'
const wallet = await dfnsClient.wallets.getWallet({ walletId })

const recipient = '0x956fbb0c88b3c597d4afdbab3e26939051ff6725'

const client = Client.forMainnet()

const transaction = await new TransferTransaction()
  .addHbarTransfer(recipient, Hbar.fromTinybars(1))
  .addHbarTransfer(wallet.address!, Hbar.fromTinybars(-1))
  .freezeWith(client)

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