{
  "manageEntity": {
    "action": "Save",
    "entityId": "203049872",
    "entityType": "Track",
    "nonce": "0x9a6d273a745de5304ebe301da4a85094559c0b7b0d0668d8626e9a0735396634",
    "signature": "0xcb6aaaf22ca82eeb836207cefe5f44ff987167d555f29aa867bb1ae55747f33018d068f4a994eb82dc1fd0c705999cc00b98b54271f9cc70135856781f3a91ca1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}