Content timestamps against disinformation

Why being able to prove when something was published turns out to matter enormously for fighting disinformation.

The disinformation problem is often a timing problem

Fabricated content frequently works by pretending to be older or newer than it is: an old photograph presented as current, a fake statement attributed to a real event, a real quote moved to a different context. If the publication time of original material can be verified independently, a whole class of these manipulations becomes detectable.

How timestamps help

Where verification changes the outcome

• Newsrooms showing the provenance of their own reporting
• Readers checking whether an image predates the event it claims to depict
• Platforms distinguishing original from republished material
• Archives proving a page has not been retroactively edited

What it cannot do

It does not tell you whether something is true. A timestamp proves a text existed at a time; a lie can be timestamped as easily as a fact. Its value is in context and provenance, which is a large share of the practical problem but not the whole of it.

Why it is worth doing anyway

Cheap, verifiable provenance raises the cost of the cheap manipulations and gives honest publishers something to point at. That is a meaningful improvement even though it is not a solution.