{
  "manageEntity": {
    "action": "Save",
    "entityId": "1969738750",
    "entityType": "Track",
    "nonce": "0x93c43beb6eb28e55216dc41dcd9ea1ffe513c9b554e5fa090a7bc7696f453c41",
    "signature": "0x9d9986e4333e5ff440ff74fa8495da4b8b4e51f8701340b6a6bf61e8d1654cdb26bdb8dff1630704888307c899ec7c65d278fde930410dd75ab4796fa922e1be1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}