{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "599751364",
    "entityType": "User",
    "nonce": "0xa01773416b3e0683dfa11466a4e9a15251e4253312415344938fccbd7adfcf1a",
    "signature": "0xed18b20d3afc096252481c218c4233c5e3f629bcda19114e015450c69cd92a39136626331391d288a8b64a3e720734be10dceaf425d0615be92faa87e59dd3d51c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}