{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "16521",
    "entityType": "User",
    "nonce": "0x8ac4724e9d612ae2e6e7dd3006db467cb337db4efc99398e159270c2f421bef6",
    "signature": "0xe3dadb5ee056724e92336a4832ac7aeb2a29e30cc2219ad14920d143ba578cd27e3f66ea1ba153e70d4c3aeb7e1908a8edcb7da94762db300145d88f51ff72cf1b",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}