Extrinsic 4338-1

{
  "heartbeat": {
    "blockNumber": 4336,
    "sessionIndex": 72,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xa6be9fbde92b752f4d9e90dfde4ef5936f7db1e71a0441aa2a91a9f7c3883c1231afb1541255a15bd81656ae86f006af0b21730080d0198bc5d4e68892ffb783"
}