Stacks Unlocks 30x DeFi Capacity With SIP-034 Upgrade
On March 17, 2026, Bitcoin Layer 2 protocol Stacks implemented a major upgrade, SIP-034, engineered to increase its capacity for decentralized finance applications by up to 30-fold. The update introduces a more efficient resource allocation system, allowing the network to support higher transaction volumes for complex financial instruments while maintaining its settlement layer on the Bitcoin blockchain.
The new mechanism refines Stacks' block budgeting system, which measures smart contract transactions across five dimensions: CPU cycles, read count, read length, write count, and write length. Previously, if a block hit its limit on just one dimension, the entire budget would partially reset, creating a bottleneck. The SIP-034 upgrade enables miners to request a reset of only the specific dimension that is exhausted, unlocking significant hidden capacity and allowing for more efficient block processing.
This upgrade unlocks additional capacity previously hidden by reasonable security concerns. Dimension-specific tenure extends let sophisticated DeFi apps push the limits on one of the budgets without prematurely stopping the block, allowing for a much smarter way of filling each block to maximize throughput of the chain.
— Alex Huth, Product Lead at Stacks Labs.
Upgrade Targets Institutional Capital in Competitive L2 Market
The technical improvement directly targets the growing institutional demand for Bitcoin-native yield strategies. By enabling higher throughput for capital-intensive applications like concentrated liquidity automated market makers (AMMs), Stacks strengthens its infrastructure to handle institutional-grade activity. Early ecosystem projects, such as Bitflow's AMM, estimate the upgrade provides up to 30x effective throughput gains under real-world conditions. Since its launch, the Stacks network has already distributed over $500 million worth of BTC in rewards through its consensus mechanism.
This enhancement arrives as competition within the Layer 2 sector intensifies. Stacks is vying for market share against established players that have already achieved significant scale. For example, Arbitrum processed 2.1 billion transactions in 2025 and its total value locked (TVL) reached $20 billion. Other major competitors include Optimism, which ended 2025 with $15 billion in TVL, and Coinbase's Base network, which attracted $8 billion in TVL within six months of its launch. By improving its core efficiency, Stacks aims to carve out a stronger position as a premier platform for building on Bitcoin.
