{
  "manageEntity": {
    "action": "Save",
    "entityId": "504506",
    "entityType": "Track",
    "nonce": "0x9c77a1d18dc46812753765e7859de02ad5d765bd67170e825301de757c44b21b",
    "signature": "0x9fcde2cf2b6d9554e17bd10fab294f57f55de1902e705f4a3d2cb01daa3ca9fb511bebe99803c2bdee09baa07388be4b346ce0ee479618810043f1b8bdf020371c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}