{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x03105ff2991d3da20de95aefeeb2f458e25f7d8fad923bfa8ff8e294d3458e43",
    "signature": "0x104cf976af1c5aca44b13fcc17ca5b6b58f9bf250eb7b4fc0569646c9f6b333f12520bdcd510b57eb06a74ab5f5d64f7af33bf93be15b12ed79386d63b1578231b",
    "signer": "0xD0E16C2194F3FFa74A153568367c42415B0b1cd8",
    "userId": "507305669"
  }
}