{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "12491",
    "entityType": "User",
    "nonce": "0xb366488564354b82c809b0fb22075c468d689235d1f938366f0b2981efeee681",
    "signature": "0x93456b7e29213d5acdf8971d40110f319bbed13b94761a65abd4db989967c97d2edc3c2c65ffe2fbd6cb6e8646f23eacc9abef1ea7f9bd57b4097b333dd7c96d1b",
    "signer": "0xb8Bf68e2681FA1A8a8ce9c78070BF9644e947378",
    "userId": "12890"
  }
}