Extrinsic 18200-1

{
  "heartbeat": {
    "blockNumber": 18198,
    "sessionIndex": 303,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x1a7f14f4ea50835ebfeb49a76ab2f6b484649d3093255bfedc2c3e58d5592a226e4f7d990b5ee5efb3cc2a6f9c137b15c21f8f5b527acd865162998d00b67189"
}