{
  "manageEntity": {
    "action": "Save",
    "entityId": "1587619712",
    "entityType": "Track",
    "nonce": "1787141162043618310",
    "signature": "0x11117fffc766693d8a792ceb28ebad77eeff13e4d986b03726d6453e0cbaa88e3560587aed2a0786edb2796fbe503d63215441d89d0e13ef423a91a1ddedf3cd1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}