Extrinsic 1473-1

{
  "heartbeat": {
    "blockNumber": 1471,
    "sessionIndex": 24,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x2a4728221c98c6b8f36cd7ebecd808558980f6b64eaae7ca29d41557398c31199d6b252bbfbfcd732efc39927a3fcd1f4cf053f382a94d1f9595ea20d584128c"
}