{
  "manageEntity": {
    "action": "Save",
    "entityId": "1719299002",
    "entityType": "Track",
    "nonce": "0xda2e13e6da57a101922980291f7692c5431a8f960af380816144e6d9782f9b7b",
    "signature": "0xa64e6a734b817d2f53900a6880ba3516d99d090ccbbcde16364cf5e75755e88738f4324bedf2c7071ab92181bed9abfd9340601be80161e593cc3138ca874e8a1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}