{
  "manageEntity": {
    "action": "Save",
    "entityId": "1663121615",
    "entityType": "Track",
    "nonce": "0xdcff69f8a433f3fe2034cc2633a013fe92ab33dee40987758d6bfb85891b78b3",
    "signature": "0xfc3c1bbf29bc81b467201955bd9b07d9a6342017f31d4074d1d9b62879023bb77af233cb4c43d1825fd144313ca5bcee97a25490b583b984d9cf78a36fb175bb1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}