{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x4666a1f75185aef9ab49777479e7721b5b01bcf6d7cdd3b85c9acd128c0058a9",
    "signature": "0x3e7a6bde0b529fcd24789a252210778b8dde78ec9ae91fa40e3ca809f68935a91540920104fc87f9ef40407b0f0c8779c00912f469c88ac58f9d77395031eb331b",
    "signer": "0xf2C3fA99Cb9E8705969eC44f84C199960ADB2139",
    "userId": "999976374"
  }
}