{
  "manageEntity": {
    "action": "Save",
    "entityId": "1596909729",
    "entityType": "Track",
    "nonce": "0x15e2d8953d3ef973092db05b62e4ddd74ae217273bea8a4f9c4c6b0800a38e0e",
    "signature": "0xa421cff994cc0aff4aadc5e211fb44eff957790f80ae5c3c66615a0e59a18fbc724b1ce0b497076fc753dcaa399c6b356f38c21772b3210d9ea4dfc6c7156b7f1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}