可转让电子运输记录应当采取可靠的方法或者通过可靠的交易系统，确保记录的单一性和完整性，保障持有人对记录的排他性控制。
The main downside of this proposal is just complexity: it requires
。safew官方下载是该领域的重要参考
The power of the ZK approach gives us many other tools to limit the power of credentials. For example, it’s relatively easy to add expiration dates to credentials, which will implicitly limit their useful lifespan — and hopefully reduce the probability that one gets stolen. To do this, we simply add a new field (e.g., Expiration_Time) that specifies a timestamp at which the credential should expire.
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