Base Hits Pause on B20 After Two Sequencer Stalls in 48 Hours 🟦

Base has postponed the mainnet enablement of its B20 token standard following a second chain halt in two days, the project said on June 26. The Activation Registry switch-on, originally slated for 6pm UTC, was pushed back "to ensure a smooth rollout" after block production went unhealthy hours before the planned activation, according to a post from Base Build (@buildonbase). "Sepolia and Vibenet remain on track," the team wrote, adding that a revised date would follow.

The June 26 stall mirrored symptoms from the previous day, when an invalid block at block 47,806,542 froze Base's sequencer and halted production for nearly two hours. Recovery in both cases required ecosystem node operators to restart their machines, and neither incident affected user funds, which remain settled on Ethereum ($ETH). The team restored blocks on June 26 within about 15 minutes, according to Base's status updates.

The back-to-back failures have renewed scrutiny of Base's single Coinbase-run sequencer, the lone engine that orders transactions on the network. Base reached Stage 1 decentralization in 2025 with fault proofs and a 10-member security council, but those changes hardened proofs and upgrades rather than the sequencer itself. The network ran nearly two years without a halt before a 20-minute outage in August 2025 first drew attention to the centralization risk, and Base now holds about $4 billion in deposits per DefiLlama.

B20 is built into Base's node software following the Beryl upgrade completed on June 25 and mirrors the ERC-20 standard, so wallets and exchanges require no changes to support it. The standard targets stablecoin and real-world asset issuers with built-in supply caps, roles, and transfer policies, and deployment calls revert until the Activation Registry is switched on. Base still issues no native token and markets itself as an issuance venue.

Beryl also cut canonical withdrawals to Ethereum from seven days to five, freeing capital for bridging providers sooner. Base has promised a full post-mortem on the consensus bug behind both halts, and whether it enables B20 before addressing the repeat stalls will shape the network's scaling roadmap aimed at institutional issuers.