Extrinsic 6915-1

{
  "heartbeat": {
    "blockNumber": 6913,
    "sessionIndex": 115,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x64c31100ef397118fc5c19cdc00a91de45ded45700532b4c1d4bc935142e3144ca0527ffd2e731f4856879ad89025fe0026e5ccd4f6f22f3ab3bd7ffd0bebf85"
}