Extrinsic 20954-1

{
  "heartbeat": {
    "blockNumber": 20952,
    "sessionIndex": 349,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xb0e6a2aba3e4be2d69ba2b28489d2cfd23457ab376aeb3d631de47a19907cf1cdb8954a30dddfd5e7ce4e7f9afeb30b8c71c797f9ebbcfe02791c195819b8287"
}