{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "304857543",
    "entityType": "User",
    "nonce": "0x7e7c34d2a07b0791e4acd0b6497b6d1a47ae7a9ab6142e3c06afdb4b7a1dd549",
    "signature": "0x78f7f8fb76cf5d9241247db3cb4a0543de33955020f5d41f34ce14203ac385c337f91516d1246370fc08f3f283540e7ad9cf56e5f349bb5b04951c9b37db5a781b",
    "signer": "0x16D3bf5a80bAfFB2f1550d49b1203D4CA532DA1C",
    "userId": "1994482"
  }
}