Extrinsic 4751-1

{
  "heartbeat": {
    "blockNumber": 4749,
    "sessionIndex": 79,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x58a97e9541e4a77f9ca501cccd694d180160709ef1fec5596f965dc65bf925129ddd86b78afa0f644390efa6abc8dbe544603df8a4197b1f3292968f88a68680"
}