Claims are the public assertion of a type of energy usage, and must be backed by legitimate cancellation statements from tracking system registries. Claims are both a discussion of legality and credibility: In the EU, supplier-to-customer renewable claims are legally connected to Guarantees of Origin that are provably cancelled in official registries to prevent double counting (also the case for REGOs redeemed in the UK). In the US, the FTC's Green Guides are explicit: claims about renewable energy usage are considered unqualified if energy derived from non-renewable sources is used but corresponding RECs are not procured to match the energy usage (or "virtually all" the energy usage in the case of manufacturing processes). Credibility of claims is a different discussion topic, relating not to the legal messaging rights of an EAC redeemer post-cancellation, but to the quality criteria and guidelines that organisations should attempt to follow when procuring EACs. The credible claims document published by RE100 is a well-established example of this theme.