{
  "manageEntity": {
    "action": "Save",
    "entityId": "251538",
    "entityType": "Track",
    "nonce": "0xaae0722f7bb1f1148904413986ce367fafa6efee24938375703c6ee7b8ffa784",
    "signature": "0x1c14208e79f0f6640614c2d9f2c1b08340de86fec1e0b4e172ab502fe228d90441c294b7852f156abffb9ef19257f2a1d232886348db7d49d56f45b4a617fdc11c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}