{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "12568",
    "entityType": "User",
    "nonce": "0x471c03850b2ec1e1a663d6e6b9789f4a48d4342bddfcd455cbf12b71e36220e6",
    "signature": "0x7211bc1b9e103dba6cbf002a0d170a313f0b1d134d79ed5b2adaf65dc35aa04e6ee4da7b0a8abc8d1a71fc2bf43204916177555c63101f1ca5c24c5e44e57d751b",
    "signer": "0xb8Bf68e2681FA1A8a8ce9c78070BF9644e947378",
    "userId": "12890"
  }
}