Extrinsic 28608-2

{
  "heartbeat": {
    "blockNumber": 28607,
    "sessionIndex": 476,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x76cd4af8207504c91beb256400711712c576edc620f30f96415ecb16e6abca4a5aa9a92ea3050cfe077d286910bace5529d717c0f109a6a91e5b7d2dfe1e088d"
}