Extrinsic 20477-1

{
  "heartbeat": {
    "blockNumber": 20475,
    "sessionIndex": 341,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xb6788fce3c8eccd6be067a4d7d1113cccb58f08f2d11725c02846b876d5b9628407b1a1a84590cc3d94ca3e6218b716863bdcbd681cee67a5be15882dfff7787"
}