Extrinsic 15741-1

{
  "heartbeat": {
    "blockNumber": 15740,
    "sessionIndex": 262,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x24d18979232f4f4d746a97f9cfed3e513ea330ab1411f86ea726937ce89e9d1314754ac2171d0173c2a86d8f9a857b4b6d447d6c59741c95d95c6a573dcd7289"
}