construction/derive - Cardano

Example code for the construction/derive JSON-RPC method. Complete guide on how to use construction/derive JSON-RPC in GetBlock Web3 documentation.

This endpoint derives the account address associated with a public key. It is an offline step in the transaction construction flow.

Parameters

The request body is a JSON object with the following fields.

Field	Type	Required	Description
network_identifier	object	Yes	The network to derive for
public_key	object	Yes	The public key, with hex_bytes and curve_type
metadata	object	No	Optional derivation metadata, such as address type

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/construction/derive' \
--header 'Content-Type: application/json' \
--data-raw '{
    "network_identifier": {
        "blockchain": "cardano",
        "network": "mainnet"
    },
    "public_key": {
        "hex_bytes": "b3c2a1d0e9f8...ed25519-public-key-hex",
        "curve_type": "edwards25519"
    },
    "metadata": {}
}'

JavaScript

example.js

const response = await fetch(
    'https://go.getblock.io/<ACCESS-TOKEN>/construction/derive',
    {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({"network_identifier": {"blockchain": "cardano", "network": "mainnet"}, "public_key": {"hex_bytes": "b3c2a1d0e9f8...ed25519-public-key-hex", "curve_type": "edwards25519"}, "metadata": {}})
    }
);
console.log(await response.json());

Python

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/construction/derive',
    headers={'Content-Type': 'application/json'},
    json={"network_identifier": {"blockchain": "cardano", "network": "mainnet"}, "public_key": {"hex_bytes": "b3c2a1d0e9f8...ed25519-public-key-hex", "curve_type": "edwards25519"}, "metadata": {}}
)

print(response.json())

Response

{
    "account_identifier": {
        "address": "addr1qxy2lpan99fcnhhyzr8w8qk4dqz4mp7g6b8h3r2v5c9d0e1f2g3h4j5k6l7m8n9p0q"
    }
}

Response Parameters

Field	Type	Description
account_identifier	object	The derived account, with an address field

Use Cases

• Address Derivation: Derive an address from a public key offline

• Wallet Setup: Generate receive addresses for a key

• Verification: Confirm an address matches a known key

• Offline Flows: Derive addresses on an air-gapped device

Error Handling

Error Code	Message	Description
1	Invalid request	A required construction field is missing or malformed
6	Transaction decode failed	The supplied transaction could not be decoded
14	Invalid signature	A supplied signature is malformed or does not match
5	Internal error	The node failed to process the construction step