Extrinsic 54915-1

{
  "heartbeat": {
    "blockNumber": 54914,
    "sessionIndex": 915,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x94505e677cdc46b67917613df737d4bd441041bd1f22560b8185f3ff362dfe1750567d5a3e9ddba7c26cc35410da7bca2a3aacd97d5ba01ac8080d0f8408728d"
}