{
  "manageEntity": {
    "action": "Save",
    "entityId": "662125410",
    "entityType": "Track",
    "nonce": "0x383485cf769f76c26f1b0010c0f99b52295395992af63eed64082eac21a729c0",
    "signature": "0x0df5d7e983988d2399ed10263ccf92dd9686236ed950b4e3e4f1fe8c96657b5d6e275883c9ed16227a477e80e393ed45eaf60bc2f783b8555412d426e400de621c",
    "signer": "0xf63b89A0Bbc03C7ec59aC257C7082A056082cDB8",
    "userId": "558452493"
  }
}