The scholarly record itself is decaying through reference rot

Beyond individual reproducibility failures, the aggregate loss is visible in the structural decay of the scholarly record itself. Every dead reference is a broken link between a published claim and the evidence that supported it; at the scale of the scholarly record, the aggregate is a measurable decline in the degree to which research can be built upon.

• 25% of all webpages from 2013-2023 are already gone, rising to 38% for pages a decade old (E-0038, S-0052).
• One in five scientific articles suffers reference rot; among articles citing web content, seven in ten have compromised scholarly context (E-0039, S-0053).
• More than 70% of URLs cited across a sample drawn from the Harvard Law Review and two other Harvard journals between 1996 and 2012 no longer resolve to the originally cited content (E-0040, S-0054).

These figures are decay rates, not decay magnitudes. They imply that the value of every published reference declines monotonically as a function of time-since-publication, and that the scholarly record's net informational content is decreasing in some dimensions even as new publications add to it.

The architectural cause is the same as in §3: cited content depends on continued access through whatever single copy or single platform originally hosted it. When that copy or platform fails (which it does at the C-0011 / E-0006 base rate), the citation breaks and the scholarly chain through it terminates. Tier 3 architectural alternatives — content-addressed citation, distributed archives, cryptographic snapshots — produce reference durability as a structural property rather than as a hope.