{
  "manageEntity": {
    "action": "Save",
    "entityId": "1621883692",
    "entityType": "Track",
    "nonce": "0x57cd474cca9b625e65391b82b765f7f7cf01cb1cc2c2275fd2bc38c01c046b5d",
    "signature": "0x4bf76d93ce65fd788e104427b29f614c9083aba10966bc1988cb52b27656382b469ea44d12b497b570ff41842ae5235c3751551390bf3199904c12fca22903631b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}