{
  "manageEntity": {
    "action": "Save",
    "entityId": "148734650",
    "entityType": "Track",
    "nonce": "0x13a1132674386c9d3cbaf809323baa6f849c21a950a7a3d3889f843fe51f5733",
    "signature": "0xf91fa1e4c92365d67a83944e7ed1a0742c944b09b68293a53fe8f1802bd1359134fbc8f310fdb743fc27e3a3c3188f0fc2b6aab726294edd777c4fbf90b820fb1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}