{
  "manageEntity": {
    "action": "Save",
    "entityId": "964641",
    "entityType": "Track",
    "nonce": "0x14aa8da4e0b2a0cf3d8c222b2b548b4afeddda9d3d6fbbeadc79a87bc812f007",
    "signature": "0x5aa33c493132716c0730923f4322e21a89771516ebe92dfd985ea7f902d180dd05e35b4abf2e146e9d01e01be7d4a73e2a751292a909526a0f8359c26b43dd5e1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}