{
  "manageEntity": {
    "action": "Save",
    "entityId": "688243571",
    "entityType": "Track",
    "nonce": "1786637462022161321",
    "signature": "0x507bf44166231172a216af1d04a8e7172eb296ee9a5118ac820051594b7cbe7e182a4763cf924a1bf254a19967d4a1db77728a158da449123a01831e045092091c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}