{
  "manageEntity": {
    "action": "Save",
    "entityId": "390074452",
    "entityType": "Track",
    "nonce": "0x57648f60fc3e057eba32488a867938e7d98e2761ac44aba3c2eff095990cd365",
    "signature": "0x095d4167c31b3cc3db8891f72479ceb6bb574b9c037a3b664e1baad4391171143973036051f4d20d558f4d1d7921fbe105a04ad7d67f59457f4ed235fb6d2fe61c",
    "signer": "0xC6b9005ca9F7522F39eF22242eA15410A21DfB9A",
    "userId": "390992303"
  }
}