{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x7534945d95e68c003ecd0c4fefc1f5e688cbad1a3bdafe47b1101ea92917d218",
    "signature": "0xb73d0c670d01c009667ee8d3f8d6641326ba10934acad599447f728c8406d29441356eb2922774bbcde30bbe880ddd7f7a41f9281314f463f0359f564814d4061c",
    "signer": "0x5C3e11aE91737136957E056d03bE48858B004440",
    "userId": "600103632"
  }
}