Solana is a "layer 1" blockchain network that has many benefits for us in the context of issuing Impact Credits at the moment. It is a low-energy consuming chain based on "proof-of-stake" (PoS) and "proof-of-history" (PoH) mechanisms. Even all their calculated CO2 footprint is compensated fully with high quality offsetting projects. Moreover is excels with fast transaction times, low gas fees and is widely accepted on the majority of the larger NFT marketplaces out there (like OpenSea, MagicEden etc.) so that also secondary market trading is easy.