{
  "manageEntity": {
    "action": "Save",
    "entityId": "1890789262",
    "entityType": "Track",
    "nonce": "0x5acc59210c62a9ba46a9896c668d61e7f34342c555a4f5fc91b9ba690d8724c1",
    "signature": "0x2b117ae684867ea85de4021b7c0d0512ec264eb7f7b598ff58a61a3b87e2d3c618d59da4a86ef65c60588f25abdae9c6a0e6f675a44f88d14e721f805eb16dd91c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}