Extrinsic 54765-1

{
  "heartbeat": {
    "blockNumber": 54764,
    "sessionIndex": 912,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xfcc8360eea4306a15396be66dd0f2f44e10549fe179a870d80e466231c377a51c18b460edcc57f715b574e08aa530802d0907fe238d931e8373f153a4d2b5289"
}