{
  "manageEntity": {
    "action": "Save",
    "entityId": "532802884",
    "entityType": "Track",
    "nonce": "0x8a0ea7ae3f30440dbff41466d0cde3726511d493e2d0f0a740ca53d86b5a4bb1",
    "signature": "0x694ed37b22ccafe17e44e255a634b4b1c8be8b68a61c5c7b50c6d001f2d65e6f2ca80818ea7aed70cf5db0e1913fc91ab4934fa6003879336fffbca059a48f071c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}