Extrinsic 7725-1

{
  "heartbeat": {
    "blockNumber": 7724,
    "sessionIndex": 128,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xfa0c8e4b206f5eb87b25b6274566a3cc88c3d53b43ddf838a964b6ae705735469b26f01e8841d2daa4206d38aa00848d18d210c6b34d95e54e80309cf3e8ae84"
}