{
  "manageEntity": {
    "action": "Save",
    "entityId": "387477449",
    "entityType": "Track",
    "nonce": "1785588687628703209",
    "signature": "0x37f0d4af73b3effa792689235fd583f383167a356d3c03390d9a71d16a1a9b855f8b6f62a3ce069d33666d55a4d3864cb8d30a10b418c3aed024b84ecbf902d21c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}