{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "507325593",
    "entityType": "User",
    "nonce": "0x3157881d1658200ae492185634b0a2329827ea53ccbd43f5a10d6c47c6c052a9",
    "signature": "0xe4c68525af2fb28d552c4c7844c2dd3cb0d6d5cf97326731af83583b4bceafde1a624a26b81db0eb851529d6e9973e8d214de23913a80be10f1091aa8f14e2ff1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}