{
  "manageEntity": {
    "action": "Save",
    "entityId": "526565",
    "entityType": "Track",
    "nonce": "1787129574665995158",
    "signature": "0x79ff46de63b2594d9270e2941cd246dac31e78367e6674d77cfefd23f35a6c76050e5b83f5cdb4197ab7725e50d3ff6d28bafe4486ede7035e63d64a7764099d1b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}