{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "121201250",
    "entityType": "User",
    "nonce": "0xe59924c1a0c069ba2a78759c9f78245b6ec4f1be0021b8a4f6c9aa5b82f0b225",
    "signature": "0x3cdeabefd48ede0229d075fa1de6c5cbbd1c7fdba0cd304b992c404c950f88f50a5d20a98770614ec5ef93d1f0c3bc2cf646ec954cce736a8edd64975be796761c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}