{
  "manageEntity": {
    "action": "Save",
    "entityId": "1513111641",
    "entityType": "Track",
    "nonce": "1786666298720043360",
    "signature": "0x6e8645f97f33ac48491e2a89d70b7fb675d6cd8c96ceabae9849350a510af2ea7001b114fb36fa890c5847ceb23d58adcde18119bb9d25ec8e8c17f40ddf1cfa1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}