{
  "manageEntity": {
    "action": "Save",
    "entityId": "1566525521",
    "entityType": "Track",
    "nonce": "0x0fb0b3d0426b8d731f2d2f250b27c4ae8e02bf3ef853f59c0f47c15ff1ecd6a5",
    "signature": "0x2e5068b38d265ee7270b9c2b2cc3e3a57b79b044367ecb75120d972fcd843a925b3e6332abcad6955b7876635c80c90827277ccdfed02a407b7039671f6e03681c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}