{
  "manageEntity": {
    "action": "Save",
    "entityId": "387477449",
    "entityType": "Track",
    "nonce": "1785588681845771511",
    "signature": "0xb99473cfbabe8753858d893e6ebe1322c731926fdc7cc38a33be0842f83b912745365b3b4d139138e096b8932bcd813bd4c8770f512144eb763232ddb00d55b41c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}