Generate metadata blob

POST

https://dotassethub-playbook.nownodes.io/v1/transaction/metadata-blob

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Changed. The returned metadataBlob now also contains the extrinsic metadata and the chain info (specVersion, specName, base58Prefix, decimals, tokenSymbol) after the Merkle proof, as required by offline signers. Before, it contained the proof only. Request and response fields are unchanged.

Generates a metadata blob for transaction signing with the CheckMetadataHash extension.

Body

application/json

Request with 'tx' field and optional 'at' block

object

Response

200OK

Metadata blob

400Bad Request

Invalid parameters

500Internal Server Error

Internal server error

503Service Unavailable

Service unavailable

Generate metadata blob

curl -X POST 'https://dotassethub-playbook.nownodes.io/v1/transaction/metadata-blob' \
  -H 'Content-Type: application/json' \
  -d '{}'

const response = await fetch('https://dotassethub-playbook.nownodes.io/v1/transaction/metadata-blob', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({}),
});

const data = await response.json();

require 'net/http'
require 'json'

uri = URI('https://dotassethub-playbook.nownodes.io/v1/transaction/metadata-blob')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{}'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }
data = JSON.parse(response.body)

import requests

payload = {}

response = requests.post('https://dotassethub-playbook.nownodes.io/v1/transaction/metadata-blob', json=payload)
data = response.json()

const response = await fetch('https://dotassethub-playbook.nownodes.io/v1/transaction/metadata-blob', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({}),
});

const data = await response.json();

const endpoint = "https://dotassethub-playbook.nownodes.io/v1/transaction/metadata-blob";
const apiKey = "YOUR_API_KEY";

async function nownodesRequest(payload) {
  const response = await fetch(endpoint, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "api-key": apiKey,
    },
    body: JSON.stringify(payload),
  });

  return response.json();
}

const result = await nownodesRequest({});
console.log(result);

const response = await fetch('https://dotassethub-playbook.nownodes.io/v1/transaction/metadata-blob', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({}),
});

const data = await response.json();

import requests

payload = {}

response = requests.post('https://dotassethub-playbook.nownodes.io/v1/transaction/metadata-blob', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://dotassethub-playbook.nownodes.io/v1/transaction/metadata-blob')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{}'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }
data = JSON.parse(response.body)

Request Body

{}

200

{}