{
  "manageEntity": {
    "action": "Save",
    "entityId": "475021",
    "entityType": "Track",
    "nonce": "0x185b77ef9f32fc250ed68a4e4a65b5d4e4a86dd748c0aa4396d0defe3a7a766d",
    "signature": "0x7452f02696a20095ae155af462a27e1cb3e8c584309d2ce6badb5a7a27b17a875accc6b88d281ab61f51b0936df9937e4fe31a3d14b7b8d66d10cd44f4c7a9a51c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}