USDBase Sets Beryl Mainnet Upgrade for June 25
New token standard and withdrawal changes headline network update
TL;DR
- Base deployed Beryl to Base Sepolia ahead of a planned mainnet activation on June 25, 2026.
- The upgrade introduces B20, a native token standard for stablecoins and other digital assets.
- Beryl also reduces the standard Base-to-Ethereum withdrawal delay and integrates Reth V2.
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Base is preparing to activate its Beryl upgrade on mainnet on June 25, 2026, after deploying the upgrade to Base Sepolia, with the update introducing a native B20 token standard, shorter standard withdrawals to Ethereum and infrastructure changes through Reth V2.
Beryl is Base’s second major network upgrade and follows Azul, the network’s earlier upgrade that activated on mainnet in May 2026.
Beryl focuses on three main areas: native token issuance, withdrawal timing and node infrastructure. The update is designed to make stablecoins and other digital assets more native to Base’s architecture while preserving compatibility with the ERC-20 ecosystem already used by wallets, exchanges, indexers and other infrastructure providers.
B20 brings token issuance into Base node software
The main feature in Beryl is B20, a native token standard for issuing stablecoins and other digital assets directly through Base’s node software. Base’s engineering team said B20 allows stablecoins and other assets to be issued directly within the network’s node software, instead of relying only on conventional smart-contract deployment patterns.
B20 implements the full ERC-20 specification, meaning it is designed to remain compatible with existing ERC-20 infrastructure. The standard also supports ERC-2612 permits, allowing token holders to approve spenders through cryptographic signatures rather than submitting a separate approval transaction before a later transaction can proceed.
The technical distinction is that B20 tokens are implemented as precompiled contracts. Instead of running as ordinary deployed EVM bytecode, B20 token logic is written in Rust and executed directly inside Base’s node software. The design is intended to reduce overhead and potentially improve performance while keeping token behavior familiar to existing Ethereum-compatible systems.
Beryl also introduces an Issuer Toolkit for B20 tokens. The toolkit gives issuers built-in operational controls, including role-based access controls, minting and burning capabilities, optional supply caps, granular transfer policies, transfer restrictions and freeze-and-seize functions. Base said the Issuer Toolkit is built on code audited by Base and Spearbit.
B20 launches with two token variants. One is a general-purpose asset version for broader digital asset issuance. The other is a stablecoin-specific version that uses fixed six-decimal precision and allows issuers to define a currency code, making the format more explicit for fiat-denominated or currency-linked assets.
Base said future updates may allow issuers to pay gas fees using their own B20 tokens rather than ETH. That feature is not included as an active Beryl mainnet function in the provided information, but it is listed as a possible future addition.
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Beryl shortens standard Base-to-Ethereum withdrawals
Beryl also reduces the standard withdrawal delay from Base to Ethereum from seven days to five days for the route used by most bridging providers. The change targets the more widely used withdrawal path rather than the faster route introduced with Base’s previous upgrade.
The five-day withdrawal window builds on Multiproofs, a system introduced during Azul. Multiproofs created a one-day finalization path for withdrawals when both a trusted execution environment and a zero-knowledge proof agree that a transaction is legitimate.
Base said the one-day Multiproofs path has seen limited real-world usage because generating the required zero-knowledge proof is costly. Beryl therefore focuses on improving the slower single-proof withdrawal path that most bridges and users are more likely to encounter.
The earlier seven-day withdrawal window came from Base’s prior fault-proof system, where longer delays gave challengers time to dispute a withdrawal. Base said Multiproofs changed the purpose of the delay from broad dispute time to detecting and disabling a faulty prover, allowing the withdrawal window to shrink.
Reth V2 is the third major part of Beryl. The Rust-based execution client powers Base, and one source states that Reth has been Base’s sole client since Azul. Reth V2 reduces disk usage across full nodes, minimal nodes and archive nodes while improving overall performance.
The efficiency gains from Reth V2 are expected to allow Base to increase block gas targets without overloading its sequencer or RPC nodes. Higher block gas targets would give builders more available blockspace without immediately creating the same infrastructure pressure.
Beryl also reflects Base’s faster upgrade cadence. The upgrade arrives roughly four weeks after Azul’s mainnet activation, with Base crediting the pace to its February 2026 move away from a shared dependency on Optimism’s OP Stack toward its own unified technology stack.
Base’s next planned upgrade is Cobalt, targeted for September 2026. Cobalt is expected to introduce native account abstraction, including built-in gas sponsorship and transaction batching, along with additional B20 features and a unified node binary that combines Base’s consensus and execution clients.
FAQ
What is Base Beryl?
Beryl is Base’s second major network upgrade, adding B20, withdrawal changes and Reth V2.
When is Beryl planned for mainnet?
Base is targeting June 25, 2026, for Beryl’s mainnet activation.
What is B20?
B20 is a native token standard for stablecoins and other assets issued through Base node software.
What comes after Beryl?
Base’s next planned upgrade is Cobalt, targeted for September 2026.
This article has been refined and enhanced by ChatGPT.
