{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "678556080",
    "entityType": "User",
    "nonce": "0x4d2323e416fd8d1cb94bef9bdc426b499c750509dbfb0833c8f5a82f2299378c",
    "signature": "0x73750265350056aae7aabcd64c2ddeb09878d8a1480544723fb16836fe97f6a42ac900fdea11c39ed6c429360d668ef9d022d96a5128ec44a97b66e7316b1ebb1b",
    "signer": "0x9e3231A1D406901408a187cb20b331513f6110eE",
    "userId": "463741311"
  }
}