{
  "manageEntity": {
    "action": "Save",
    "entityId": "241521748",
    "entityType": "Track",
    "nonce": "1786336535836887864",
    "signature": "0x2c952fec0f807454aa82d6e78559e95b34b371f46b223927e2c3e3c896fabf8b509ba3569abaebd2694f5825feb059b18dd1ec7957c18eff7b3a1517e4024c6c1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}