Extrinsic 19451-1

{
  "heartbeat": {
    "blockNumber": 19450,
    "sessionIndex": 324,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x063b802e972d3f49f2e0d48e3cf2bef8fb792eed3af633f5d473c8b7db0f372849fd8ff2e1f9fbfcc0f41ab3611b5588372a6d8a6b803d7b1f6bc79046c26a85"
}