Sign and Broadcast Transaction

In the Unified API, transaction signing logic varies depending on the specific blockchain network. Nevertheless, a unified method to broadcast a signed transaction to the network is used.

To sign and broadcast a transaction to the Unified API supported network, follow these steps:

Prepare unsigned transactions in Base64 encrypted or hex-encoded format (unsignedTransactionData by default).
Sign the transaction using the guides from the table below.

Blockchain network	Unified API chain	Signing Instructions
Aptos	aptos	🔗 Signing Instructions
Avail	avail	🔗 Signing Instructions
Babylon (BTC)	babylon-btc	🔗 Signing Instructions
Babylon Genesis (BABY)	babylon
Cardano	cardano	🔗 Signing Instructions
Celestia	celestia
Cosmos	cosmos
dYdX	dydx	🔗 Signing Instructions
Ethereum	eth_ssv	🔗 Signing Instructions
Hyperliquid	hyperliquid	🔗 Signing Instructions
Near	near	🔗 Signing Instructions
Polkadot	polkadot	🔗 Signing Instructions
Polygon	polygon	🔗 Signing Instructions
Sei	sei	🔗 Signing Instructions
Solana	solana	🔗 Signing Instructions
Sui	sui	🔗 Signing Instructions
Story Protocol	story	🔗 Signing Instructions
Tezos	xtz	🔗 Signing Instructions
The Graph	grt	🔗 Signing Instructions
TON	ton_whales	🔗 Signing Instructions
Tron	tron	🔗 Signing Instructions

Broadcast the signed transaction to the network by sending a POST request to /api/v1/unified/transaction/broadcast.

Example request (for solana chain and testnet network):

curl --request POST \
     --url https://api-test.p2p.org/api/v1/unified/transaction/broadcast \
     --header 'Content-Type: application/json' \
     --header 'Authorization: Bearer <token>' \
     --data '{
    "chain": "solana",
    "network": "testnet",
    "stakerAddress": "9FfyCk9kqgfpg1gYMw8rhksZcAg4JiD9xhuMvkFVdjQY",
    "signedTransaction": "AdtQhLeM0eOMdV7rvagYx3V8mra6CMaiVgeNTcgTds8ltjDUwJi3LMGhZ+Txqj26nJMJa7MxFWe5lmIxAnjKsQUBAAIEep+wazhVDEf2XiuHusgypzGMGyd4WaFZ6lzpHIypRJ3qFo72gQoaoUsCAJcUGGTQGdOONNYMBdVbIhEKwGitMwah2BeRN1QqmDQ3vf4qerJVf1NcinhyK2ikncAAAAAABqfVFxjHdMkoVmOYaR1etoteuKObS21cc1VbIQAAAABojzQ55lMuIXx6AWTccH48p4L12JlvUuCfHkOik1nJLAECAwEDAAQFAAAA"
}'

chain — blockchain network.
network — environment in which the transaction is processed.
stakerAddress — staking account address keeping the staked tokens.
signedTransaction — signed transaction in Base64 encrypted format, which contains all transaction details (e.g., accounts, instructions, and signatures) required to broadcast the transaction to the network.

Example response (for solana chain and testnet network):

{
    "error": null,
    "result": {
        "extraData": {
            "transactionId": "2Bno5j3tex8VmcCR2M6JQnjtPxDuqAvSAUjSDpd6gaasRfEQeoWH9MRQdU7ANNtFFbG9UQAGByG1UwPS1qersmyd",
            "slot": 307375529,
            "signerAccounts": [
                "9i5cTqci1W6DHdYfT7WbiNhP5DXvnPNTXvS9fTBFfuSw",
                "6GtymMn8cDTy3xHH9AitwP6skbKvBkD53XBE2xSu1tCR",
                "11111111111111111111111111111111",
                "A93XLdBKfc4pwEMAvdFeyxnF6HauN5erNDFbUsemWiaB",
                "Stake11111111111111111111111111111111111111",
                "StakeConfig11111111111111111111111111111111",
                "SysvarC1ock11111111111111111111111111111111",
                "SysvarRent111111111111111111111111111111111",
                "SysvarStakeHistory1111111111111111111111111"
            ],
            "createdAt": "2024-12-17T19:41:27.450Z"
        }
    }
}

extraData — additional transaction details specific to the network:
- transactionId — block hash in which the transaction has been included.
- slot — period of time during which each leader collects transactions and creates a block in the Solana network.
- signerAccounts — account addresses that signed the transaction.
- createdAt — timestamp of the transaction in the ISO 8601 format.

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