{
  "manageEntity": {
    "action": "Save",
    "entityId": "124441562",
    "entityType": "Track",
    "nonce": "0xce9f4ff613b96cc9c28b050e1353bf7d562779d9e7543555c7a75b914c6d461f",
    "signature": "0x740ed70fc4e3c83fc6295e2358392b55704867c57b59104c5953bd198325241074c2dea018a2efad1b088ef45e5ece9a4f45d8023c49d4fcb6aa856dcec2a1f41c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}