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Binance, the world's largest cryptocurrency exchange, halted withdrawals on October 29, 2026 after unauthorized transfers drained one of its wallets.

Coinbase, Bithumb, Daishin Securities and Mirae Asset Global Investments each confirmed unrelated breaches within the same day, with three of the four incidents reported in South Korea.

Solana switched on its Alpenglow upgrade on October 21, 2026, replacing the way its validators agree that a transaction is final. Validators are the computers that run the network, and finality is the point where a transaction can no longer be reversed.

Appchains are blockchains built to support a single application, providing dedicated resources instead of competing for block space with other decentralized applications.

A modular blockchain is a specialized network that delegates specific functions to external layers rather than handling them all locally.

Circle Arc is a specialized Layer-1 blockchain developed by Circle Internet Financial, the issuer of the USDC stablecoin.