{
  "manageEntity": {
    "action": "Save",
    "entityId": "734273959",
    "entityType": "Track",
    "nonce": "1786477216491395559",
    "signature": "0x49a42cec233cd9d7ebc4bf8f9b1aa609343ca014bf805f6014fdd9ac81cd739e28202b8173f210c5af38f16ec94ad24447d24764556102e52f4ec29547eafb381b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}