{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0xdb6a69341259b59c5ea1ee1872a019741646f8568eaf74bd11020e7f84730550",
    "signature": "0xa7e16f5c12da8a02682aa3e5bedf69cacc20d0e4b5bac7f84744c5c5312417ca486bf4cd94b8e40ea0901e58be7f3c8dd6135e16a666ca75f7b0b40906bcf7031c",
    "signer": "0x108Ca5908383C019023f94e290cb0959DC3E4D81",
    "userId": "391154140"
  }
}