Circularise

Circularise is a Dutch supply chain transparency software provider using blockchain technology to enable circular economy at scale. 

The startup uses blockchain for its two supply chain solutions. One is for product passports that provide provenance and carbon footprint assessments across supply chains. This uses the company's Smart Questioning technology based on Zero Knowledge Proofs to allow communication without sharing data, identity, or position in the supply chain. For example, it's possible to ask about the carbon footprint of an item without disclosing all the suppliers in the chain.

A second solution is for so-called mass balancing. Many manufacturing processes use inputs (feedstock) that are more challenging to identify. For example, recycled materials might be mixed with fossil fuels during production. One way to measure the recycled proportion is to say that X proportion of the weight is based on recycled materials. It's a practical methodology that is seen as controversial in some quarters.