Extrinsic 20888-1

{
  "heartbeat": {
    "blockNumber": 20886,
    "sessionIndex": 348,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x2a8145083cbb345ceeb20fe9f28d386e5e330ce6966b70102a92f3a1358edd18069a445c3fe2116aa3c0868166f1cd8ded6c846e13888108a1e254acf44d3282"
}