{
  "manageEntity": {
    "action": "Save",
    "entityId": "48974511",
    "entityType": "Track",
    "nonce": "0x8772d1bef4de74ce8bc7e3965adeaaee7210ff76c7f83f0b57c833a5f6e6f125",
    "signature": "0x484eb80185df07bfb5d2ade1cd6d71509e930e123528740c430a820dfd6751cf62d4c18adfbe71c025251790103625148b4314554052d1a861b3eb4ba9040de21b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}