{
  "manageEntity": {
    "action": "Save",
    "entityId": "1491597591",
    "entityType": "Track",
    "nonce": "0xa64702afc77d967a8b4c159ef0732fcc6a339e7648b213f6f7ccf6f7c5f931c3",
    "signature": "0x1fa32720ccdf12799563b881c55675f9afd54725218abe12f4d3cd18f4b0c390378fdd1a69b4cb005fb6fc7c70633bf3d1ee31d48bb79c380561707ed6a546d91c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}