The SEC's ruling on 'DAO' tokens as securities was influenced by the level of decentralization in the token's network.The Financial Stability Board in the UK expressed concerns about power concentration in decentralized technologies.The EU's Markets in Crypto-assets regulation (MiCA) mentions decentralization as a key factor in determining if a system falls within its scope.Testing new applications or ledger features in blockchains is done through testnets, which indirectly safeguard ledger properties.