{
  "manageEntity": {
    "action": "Save",
    "entityId": "620690",
    "entityType": "Track",
    "nonce": "0x13b62e2bcd56950413257dad37a452b9b51386af3bf2006f77f749d2580a9944",
    "signature": "0x0459554fa9382d5c034d80c79c7514455433cb1a0bcb4c6767001bde05e6abe17738bbae2ce50737ae63daecc61521ff4ae1eb2ed7076007ee6c2caae304de521b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}