{
  "manageEntity": {
    "action": "Save",
    "entityId": "550817766",
    "entityType": "Track",
    "nonce": "0x456e6964dea695c6409ad9de79dfcbedbc3831cccd84267566b619e4638e4285",
    "signature": "0xcdbd9c37ea26d40f4dcbe8bdc74e46a338d9c0ec5072669914c40fab2b5432641c314795d90ed79065527318b48b7e4b86e7d8f8fb6a0fe4ccf2b04807d833941b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}