Extrinsic 20286-1

{
  "heartbeat": {
    "blockNumber": 20285,
    "sessionIndex": 338,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x6aa483d7d9ddc4fe7b99819b53f4d26bd8f6660fb605793839eaffd317f57008e61241e37da2e3c5a55fca6504cb64fb0a8b036f16332a92a4db878a5a93d18d"
}