Extrinsic 19390-1

{
  "heartbeat": {
    "blockNumber": 19388,
    "sessionIndex": 323,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x10e12edd3a3d5bddd2a6749e39bb81809815d28e3fc2fae2605245a27b6f4e6a091f52207ce613b2e5577fc98e5a0fc2e197f05179630c0b68bb0f1c4c911d83"
}