{
  "manageEntity": {
    "action": "Save",
    "entityId": "436762849",
    "entityType": "Track",
    "nonce": "1786566783107917071",
    "signature": "0xd6c3a4dff9e307b8c03d683fc3e311d37b7e68e31761950fcdb83465338d7c5d2a91f51cf1560a1c4225588cb56b41636729d9d43411d02579bd285519ba0dda1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}