Extrinsic 12917-1

{
  "heartbeat": {
    "blockNumber": 12916,
    "sessionIndex": 215,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x708a1da7d0c65580e220911f4a0f4871c89bc7c9e5e31fcdfce5d126ed1fa22aeca73117157151a64a6047e9186174607535d92a71569f5ecef463ec97affe8b"
}