{
  "manageEntity": {
    "action": "Save",
    "entityId": "1440419348",
    "entityType": "Track",
    "nonce": "1794299281147160892",
    "signature": "0x86cee7198a5e5c45b8e34cd33c9e034c68f271d0d0c70f68bcc3dd7ac2ea56ca713a2158f7f18772586617ecf958919cc7daaf134d2a1edb7f3de8f4bd29edf71b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}