{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "668504116",
    "entityType": "User",
    "nonce": "0xbb278d22c22ab42493f4afcd0a736f7eff0387ff543d6d0ea014b4fe9f29f9d4",
    "signature": "0xf259a694f1fc9b313f0017ed4a2293910cf86fb91af0a6a66babcf25172f20d422a02eddda23ad13702281c986490ca864d2b6e30408e0ae7e5c64422a4d45801c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}