{
  "manageEntity": {
    "action": "Save",
    "entityId": "623715712",
    "entityType": "Track",
    "nonce": "0x3d1c9b73f8609e6cb7c51641546594b4e7543b9e6c7ceb304c2feefd7fb3df56",
    "signature": "0x2bec9dd6b815bae57f9e0ad83ea5b0e2b5f44102aeff41e92c5dc94fad2ca43941f0cd225803ca3577b0d199319e5ab2d1c64f195b9d18a93be84de65b778afb1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}