思考与写作blog.smartdec.net
你并不需要区块链：八个流行用例为何行不通
You Do Not Need Blockchain: Popular Use Cases and Why They Do Not Work
2019 — 2025，它一次次回到首页
黑点是上首页（≥ 50 分）的那次投稿，空心点是没冲上去的投稿，点越大分数越高。
导读
这篇文章逐一分析了八个常见的区块链应用场景（冷链运输、奢侈品防伪、土地登记等），论证它们其实用普通数据库加可信机构就能解决，区块链并非必要。文章在 2019 和 2025 两次登上 HN 首页，是“你不需要区块链”这一经典论辩的代表作。
为什么经久不衰：它系统性地拆解了区块链炒作中最常见的用例，时隔多年仍是判断“该不该用区块链”时最常被引用的清醒剂。
HN 评论精选
区块链唯一真正的优势场景是无法诉诸法律与合同的场合，其余用数据库加合同即可
我在这个网站说过好几次了，但还要再说一遍：区块链是更优（甚至是唯一）解决方案的场景只有一个——当你们无法依靠合同和法律系统来建立信任时。换句话说，就是违法的事情。其他任何 conceivable 的用例，数据库加双方合同都是更优的方案。补充说明：我说的“数据库加合同”就是世界运转的方式，自人类社会存在以来一直如此——双方有信任，还有多层次的纠纷解决机制，从客服电话、评价、负面曝光一直到法院。各位，这套东西是有效的，世界就是这么运转的。
gregschlom查看英文原文
I've said this several times before on this site but will keep repeating it: there's exactly one use case where the blockchain is a superior (and, in fact, the only) solution: when you can't use contracts and the legal system to ensure trust between the parties. In other words, anything illegal. For any other conceivable use case, a database and a contract between parties are a superior solution. Edit: To clarify what I mean by "a database and a contract": I mean the way the world does business, and as been for as long as society exists. There's trust between parties, and there's a multi-layered system in place to resolve disputes, starting from the customer support call center, reviews, bad publicity, and going all the way to the courts. Guys, this works. It's literally how the world works.
部分反例其实可以靠监管和追踪机制解决，但结论仍是区块链非必需
我讨厌区块链炒作，我认为大多数用途都可以用可信机构托管的简单数据库解决。但只看了前两个例子我就已经不同意了。第一个：只有当运输方篡改传感器毫无风险时才成立；一旦引入随机抽查和重罚，系统就可信多了——但那样的话，直接把温度记录托管给验证机构就行了。第二个例子更有说服力：信任链当然在信任链断掉的地方断掉！但如果每个 LV 手袋都被追踪、你确切知道它是已售出还是应该在某个货架上，就不存在重复出售的风险（至少与比特币双花同级）。
melkiaur查看英文原文
I hate the blockchain hype. I think most uses can be solved by a simple database hosted by a trusted authority. Yet, just reading the first two samples, I already disagree with them. Re the 1st one: it's true only if the transporter doesn't risk anything if the sensor is tampered with. As soon as you introduce strong fines and/or consequences if a validating authority randomly checks your goods and discover some tampering, the system is a bit more likely to be trusted. But of course, in such a case, you might as well just host the temperature log with the validating authority (like it's done for Concrete, or in the Auto industry). The second one is even more compelling: of course the trust chain stops when the trust chains stops ! But if every luxury Louis Vuitton handbag is tracked and you know precisely whether it's been sold or whether it's supposed to be sitting on a shop shelf somewhere, you have zero risk of double sell (or at least, within the same limits as a bitcoin double-spend).
反方观点：减少信任仍有价值，区块链可防契据欺诈并实现房产代币化
文章的主要论证是一个逻辑谬误：仍需某种信任，不代表最小化信任没有价值。土地登记的论证就是最好的例子。“监管机构可以自己改写记录，所以区块链没用”——不，价值恰恰在于强制变更所有权的是监管机构而不是你。契据欺诈是严重问题，区块链可以完全防范：伪造签名或遗嘱变得不可能，遗嘱哈希会与产权记录一起存储。职员为牟利篡改登记也将无从下手，强制夺走产权的唯一途径是提供密码学签名的法院命令。此外，代币化的房产能让目前极难实现的事情变得轻而易举，比如用你在 A 国房产的 1% 作为在 B 国租车的抵押。
nootropicat查看英文原文
The main argument is a logical fallacy: just because some trust is still required doesn't mean there's no value in minimizing it. The land registry argument is the best example of this fallacy >the regulatory authority can make its own record and thus rewrite yours, which means that blockchain doesn’t work. No, the value is precisely the fact that it's the regulatory authority that forcibly changes ownership, and not you. Deed fraud [1] is a serious issue. Blockchain would protect against it completely: forging a signature or a will would be impossible. Rather than a document of dubious provenance, the will's hash would be stored along with the property record. Very likely in many cases of deed fraud the clerk changing the registry knows it's fraudulent and changes it for financial gain. That would become impossible also. The only way to forcibly take the property would be a provide a cryptographically signed court order. That's only for the security side of things. Tokenized real estate would make things that are currently very hard to do trivial, like using 1% of your home in country A as collateral for a rented car in country B. It's theoretically possible right now, but arranging that would require so much effort nobody does it. With a house record on the blockchain you would first tokenize it (transfer the ownership to a smart contract with tokens) and then transfer 1% of tokens to a car rental smart contract. Same for every kind of possession. Own google stock and want to use it as collateral for X? Why not. Want to sell 1% of your rental property to an investor in another country? Easy, no paperwork needed. Maybe it's never going to happen, but I think it's going to. The blockchain revolution would do to finance what internet did to information. Everything that's being done online was technically possible before it - theoretically, I could have written this exact post and physically mailed it to everyone who's ever going to read it. [1] https://www.lifelock.com/learn-fraud-deed-fraud-losing-your-home-with-the-stroke-of-a-pen.html
推荐一张判断项目是否需要区块链的流程图
这让我想起了 @MalwareTechBlog 那张很有用的流程图——“如何判断你的项目是否需要区块链”。
czr查看英文原文
I'm reminded of the helpful "How to decide if blockchain is right for your project" flowchart (https://pbs.twimg.com/media/DPFvZuqU8AAeU0C?format=jpg) from @MalwareTechBlog.
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