{
  "manageEntity": {
    "action": "Save",
    "entityId": "539074921",
    "entityType": "Track",
    "nonce": "0x0753f0555368afaa4631d4a1426d9f89360bbf6e9e6114c345ccf1350be359d4",
    "signature": "0xa8acf57df43fa13edbf7e39e0e84ad1330db03f475335c807f03de651a934f3b7abf49642f85e3ca9de76b14c6f41d8cfbf80928c908356e3812fd80f172af3e1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}