Hyperledger Besu
Hyperledger Besu is an enterprise-grade Ethereum client supporting both public Ethereum and private/permissioned networks — used by JPMorgan (Quorum fork), SWIFT, and multiple central banks for tokenized asset pilots.
Goldman Sachs GS DAP: Building a Private Blockchain for Institutional Digital Asset Markets
Goldman Sachs' Digital Asset Platform (GS DAP) has tokenized $700M+ in digital bonds for the European Investment Bank and others. Goldman's approach uses a permissioned blockchain to modernize capital markets infrastructure while maintaining regulatory control.