{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "21640",
    "entityType": "User",
    "nonce": "0xbe0ce15fd127a5ac671f8f6a0fdbc0804e019ddfde271c5ce855c75aeaeb753a",
    "signature": "0x8df4876971095b76a07de573663ed5f203a3f4d54053594c9a0bd71ad3efdf2d375c93a86560a92b603e385462ef5ddc8bb2b0de53067db3eb87f900d44d8c831b",
    "signer": "0x16BE3cc7Ee03C75AD10a94fb7234B045D351825c",
    "userId": "66529124"
  }
}