{
  "manageEntity": {
    "action": "Save",
    "entityId": "1221909614",
    "entityType": "Track",
    "nonce": "0x49c594ffc82d6d7829a160d29116e8ba4cefb90aad1ed0af5705061a3605a48c",
    "signature": "0x3f1a7eddab59097673f2cd8ca400179d87d1b1990f2813a8c8317ea7c66b811874d35a6cb21fc20452a303c4028ce2b1db5325580657761c487f5399c4234ae41c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}