{
  "manageEntity": {
    "action": "Save",
    "entityId": "246144430",
    "entityType": "Track",
    "nonce": "0xb49fd3e36a25fcd4f24b83b50a26e012741aec90c2f830314d8d6d7acb23a048",
    "signature": "0xf0194f3561716dce6dc43ae12db0d694102d496bdf4513ac284b25932f803d554e20b93d2f997365ee146507c18c3931ffbd5c529b1788bd6915f655f2a7e3121c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}