{
  "manageEntity": {
    "action": "Save",
    "entityId": "143312508",
    "entityType": "Track",
    "nonce": "0x0f1265bb66234086b5f26f6b849e28c9645d2ce29cf4cdf93a7908440eba65fc",
    "signature": "0x58b2949ebef4d6a8024601d7eefba336ec6ce6a2efd76cfcf73494bdd44e0a9c45e4251460b8150bfb64f8722588dd81529c4da4e701193cd201ddf701e4ae5e1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}