Extrinsic 15668-1

{
  "heartbeat": {
    "blockNumber": 15667,
    "sessionIndex": 261,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xb483553f9e7c06b390180fd600354ca3a8feec521b91e68115fc17b61d89f96cf38ac17ab93cefc305d2dbe32fe9d7ec2026e27d34debf19653f9a204258418e"
}