{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "3407",
    "entityType": "User",
    "nonce": "0x105338b19ccdfe1f405b306dd8ba8a29389bfd80de29cfcf170b932d9cfdfd9e",
    "signature": "0x8d6302b32b17375cbf98ddabb2a4d37a7573b821e8bc0efddb6126d39cc1f87c3c0d5560b56d3b361e2b61bc2a2bb713945afc5eb13b4502f3481b3658e258071c",
    "signer": "0x06902ed62bf3DeB2BA8Bb75F08cE93c1E87A7Ec7",
    "userId": "789121538"
  }
}