{
  "manageEntity": {
    "action": "Save",
    "entityId": "878269462",
    "entityType": "Track",
    "nonce": "0x7462bde72340420e528c075e42481edd78cac8a8d12a2083d14d2d371401a70a",
    "signature": "0xec766c2537f2f33dfb75379967e81802af28cd194ebed568fdf4a4324089a3c1572f1346d4e5dd3cd19f2b1cbc727fc14c3973fa75ef912e7f919bc4fd30cfbe1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}