{
  "manageEntity": {
    "action": "Save",
    "entityId": "587769241",
    "entityType": "Track",
    "nonce": "1787258367298298779",
    "signature": "0xd078970fcae8ae54877a37eb0ba5887dedc1e351871176d440132c8d76e986e50f77185c9b5eec8109117ef6a4d1ef13e1d252249e3c882c029e500f5eaf607f1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}