{
  "manageEntity": {
    "action": "Save",
    "entityId": "399892480",
    "entityType": "Track",
    "nonce": "0xd91720fc589763a83d4f13dbf087505cf5f0e507b4169f2352196d0d381b7b86",
    "signature": "0x68b80fead15d538bcc805c5eb2b7ed920b99e00378060a058c856a96d0571b09146e92965443a009db12d18d5d50655ec79f636ac36c181ae0846f50b6a7e7291c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}