Extrinsic 12889-2

{
  "heartbeat": {
    "blockNumber": 12887,
    "sessionIndex": 214,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xd406480d6223af06f95df543523323153b772d0e24f9f4b8d502c6d4f4376e3b4ecbbe08014c32c0a2484b5998fceded9f18fafea5629b1e7c1e2ad9a6a84e8b"
}