Leading certifier in north America relies on ASTM standards. Do not care about bio-based content.
DIN CERTO: German institute relies on EN Standards, but ASTM D6866 is acceptable
Japan BioPlastic Association: relies on ISO standards, but ASTM D6866 is also acceptable
USDA BioPreferred: relies on ASTM standards, but do not care about compostability.
AIB-Vinçotte: relies on EN standards
Label
Most labels concern about bio-based content with exception of BPI