Nansen review

What labelling actually buys

Nansen's differentiator is attribution: turning anonymous addresses into named entities and cohorts, so a flow becomes a story about who is moving. For a professional desk that is genuinely valuable, and no free alternative comes close to the coverage.

The verification problem

The labels are proprietary and cannot be reproduced by a third party. The underlying transactions are public and checkable; the attribution on top of them is not. That is not a criticism of the accuracy so much as a statement of what kind of evidence it is — you are trusting a vendor's judgement, and any conclusion you publish inherits that dependency.

Priced for desks, not individuals

The free tier is limited and the labelling features that justify the product sit in paid tiers, with prices published. Some labels on older addresses also age badly, which matters most in exactly the historical analysis people buy the product to do. Exports exist on paid plans; the labels themselves are not portable.

How to use it without over-trusting it

Treat a label as a hypothesis with evidence attached rather than a fact, check the underlying transactions when a conclusion matters, and be sceptical of attributions on addresses that have been dormant for years.

Who it is for

Desks trading on flow, funds doing diligence, and researchers whose output can carry a vendor dependency. Individual investors will struggle to extract the price in value.