Link Rot: Half the Supreme Court's Cited Links Have Rotted. Yours Are Next.

July 11, 2026

In 2014, Harvard researchers Lawrence Lessig, Jonathan Zittrain, and Kendra Albert checked every web link cited in United States Supreme Court opinions. Roughly half, 49.9 percent, no longer led to the material the Court had cited. Not obscure blog posts in obscure cases: sources relied on in the reasoning of the highest court in the country, gone or changed.

A decade later the problem has only compounded. Pew Research Center’s 2024 study found that 38 percent of web pages that existed in 2013 were no longer accessible ten years on, and a quarter of all pages that existed at any point between 2013 and 2023 had already vanished by the study date. On Wikipedia, 54 percent of articles contain at least one dead link in their references. About one in five government and news pages contains a broken link right now.

If your work depends on citing web sources, this is not a theoretical decay curve. It is the expected fate of the majority of your citations over the life of your work.

Two kinds of rot, and the second is worse

Link rot is the obvious failure: the URL returns an error, the page is gone. Annoying, visible, at least honest.

Reference rot is quieter. The URL still works, but the content is no longer what you cited. The Harvard team found that among Supreme Court links that still technically resolved, only 76 percent still contained the originally cited material. A page that has changed under your citation is worse than a dead one, because it can now say something different while appearing to support you. A reader checking your source finds a current page, not the page you read, and has no way to know the difference.

For a legal brief, that can mean an authority that no longer says what you quoted. For a journalist, a source that now contradicts the story. For a researcher, a methods page or dataset that silently changed after publication.

Why “I saved a PDF” is not a citation strategy

Saving a local copy is better than nothing, and for private working files it is fine. As a citation practice it has two gaps. Your reader cannot see your local copy, so the citation still points at a URL that will rot. And when the content is contested, a copy on your own machine proves little: there is no independent record of when it was made or that it matches what was actually online.

The academic and legal world’s institutional answer is Perma.cc, built by the Harvard Library Innovation Lab: it archives the cited page and gives you a stable link, preserved in library custody. For citation permanence in scholarship, it is a genuinely good system, and if your institution participates, use it. Its model is trust in the custodian: a reader relies on the library consortium holding the copy faithfully, rather than on a proof they can check themselves.

What a permanent, provable citation looks like

For work where citations may be challenged rather than just followed, permanence alone is half the answer. The other half is proof. A citation-grade capture should be:

Permanent by design. Stored somewhere engineered to outlive companies and subscription payments, not on one vendor’s cloud or one person’s hard drive.

Fixed at a moment in time. The capture records exactly what the page said on the date you cited it, with the date recorded by the capture process, not typed in by hand.

Independently verifiable. Cryptographic fingerprints, computed at capture, let anyone confirm the copy is unaltered without trusting you, your firm, or the archive that holds it.

Complete. A full-fidelity capture of the page as it rendered, not a text scrape that drops the chart your argument depends on.

How Permavault does it

Permavault captures the page at its URL and stores the capture on a permanent decentralized network of roughly 300 independent nodes, funded by a long-term storage endowment. Every file is fingerprinted with cryptographic hashes at capture, producing a verifiable record anyone can check, without trusting us. The capture is designed for permanence and designed to remain verifiable even if Permavault the company is gone.

That gives you citations that cannot rot: cite the original URL for convention, and add the capture, designed for permanence, as the record of what it said. It is built so that when someone checks your source in five years, what you cited is what they see, verifiable byte for byte.

$4.99 per capture. The price is on the page. No subscriptions, no sales calls, no annual contracts.

Half of what the Supreme Court cited is already gone or changed. Whatever you are writing, the pages you rely on are on the same clock. Capture them while they still say what you read.