Extrinsic 4367-1

{
  "heartbeat": {
    "blockNumber": 4366,
    "sessionIndex": 72,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x3c4ec316c44ecb6e394cfb58dffcfbbcf447f845dce07cc55815d107b5784837004a3e933f4f186145043fcffe071839e32c7303b5d06b8e09695ce9ba0d6389"
}