{
  "manageEntity": {
    "action": "Save",
    "entityId": "1700746734",
    "entityType": "Track",
    "nonce": "0xea37af0879910ffb28ba96539490f7356a5390e050ee50a1df7238cd8f94a1d9",
    "signature": "0x5b4b602d6ec445342d809634d8e830d02b4066819c7bec05877123d3c796ff7e245fb23d6d3e7f2866e657bd17225d4d1ac964760f0aca4d1a95fe936dccc01d1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}