The slag generated as a by-product of the steelmaking process can be used to manufacture cement, reducing the generated waste and contributing to the circular economy.Currently, steelmaking companies promote little giant chick brooder kit long-term bilateral deals with one or few cement companies where the price is fixed, and the slag is a treated as commodity.We propose a new solution, which promotes slag reuse through its differentiation with a composition-based grouping and an auction.This process is carried out in a blockchain network, which increases trust in the system, provides guarantees about cobra mens fly xl the slag composition to cement companies and helps external regulators to reliably extract circularity indicators.