Extrinsic 6526-1

{
  "heartbeat": {
    "blockNumber": 6524,
    "sessionIndex": 108,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x2ec901b41c2d9d92efab1395b70de9ed82c5ad3402993eb59ad32b19d8593f28b903fcbf3ed3392efa233162f517b7bd8457328c8f8f7d16964f935a00fec389"
}