Extrinsic 20364-1

{
  "heartbeat": {
    "blockNumber": 20363,
    "sessionIndex": 339,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x769baaec354755ce3dd08e2ef51eedad6a33875c798c2e7f5d122d599b6e4c01684c0e9ec6fc72ca33ef5bac5f2928492a5d1bd0d03a4d5fe2fc006fb6a7658d"
}