{
  "manageEntity": {
    "action": "Save",
    "entityId": "752980",
    "entityType": "Track",
    "nonce": "0x8244909af9742eae7a68c0f9dabc38f41eadf93650294c376a40af1184e3078c",
    "signature": "0xbfad1bc3744622973991846b88c7f7afe2261de5f993305dc315e3335b3fe2cb5582e3d1423ebf32a210f6a443fcbf1502668623b4307f97ec00ecf529d038d81c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}