{
  "manageEntity": {
    "action": "Save",
    "entityId": "650188",
    "entityType": "Track",
    "nonce": "1788150600227306420",
    "signature": "0xc5de99c1da22878539c41267300548a0f8aac24e7594377c5571ed69af95c2080fc3154e608fa71dcf166edb9eb550521e387aac9d8d53f6a4a4900a9b0af4901b",
    "signer": "0x286E7ad8f9447D0112953Bdb1684A4b4192ECb76",
    "userId": "178070"
  }
}