Extrinsic 3261-1

{
  "heartbeat": {
    "blockNumber": 3259,
    "sessionIndex": 54,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xc67666ac31fa2f973e6b6a4383cddd89c02c78c7635f0c04d1177133fa4d8a14a606ecab9369b181a327346266597a85b6546f69c414e66e7bdc16168f339d86"
}