{
  "manageEntity": {
    "action": "Save",
    "entityId": "687822",
    "entityType": "Track",
    "nonce": "0xcc999383ec53c4f83a7a473e8d85dba80f60b6bcf6f1d86ed4aad56bc2bda672",
    "signature": "0x8dd82c45f86fa33cb1b313ad8891fc215b09dcc889f9f7071db27f9529eef0116472eb1d5ee60d3e2ae02643f84aec0f4b4b5f8cf5f4dda866b86c8f2f64a5571c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}