World Chain now provides priority blockspace for 13 million verified humans; Layer 2 blockchain brings added value to the real human network
The future of blockspace is human-first. And it’s live today.
Priority Blockspace for Humans (PBH) is now live on World Chain mainnet, representing a major milestone in the path to building a blockchain for the real human network. PBH ensures verified humans get priority—with speed, reliability, and fairness built-in from day one. This first-of-its-kind infrastructure benefits both users and developers who are looking to reach real humans and provide a frustration-free user experience.
PBH was introduced with the launch of World Chain mainnet, promising to put real humans at the heart of the block-building process. PBH represents a powerful new tool for the developers building for the <insert ticker> verified humans on World network.
Tools for Humanity (TFH), in collaboration with Flashbots, hosted an incentivized testnet event where researchers and developers stress-tested PBH under high load, explored edge cases, and probed for conditions that could break invariants. The results helped test PBH and refine the mechanism to be ready for World Chain mainnet.
Priority Blockspace
PBH is a new mechanism implemented in World Chain’s block building logic that reserves a portion at the top of each block’s space for transactions sent from verified humans. Where bots create congestion, PBH provides a priority lane for real humans.
During periods of high demand when blockspace becomes congested, PBH ensures that real humans can continue interacting with core onchain services like proof of human verifications, Mini Apps, or grant claims without delay or disruption. In addition, human transactions get included without needing to pay “priority fees” to get included in the block.
Unlike priority systems based on gas fees or economic bidding, PBH introduces a new dimension of transaction ordering: humanness. With PBH, Orb-verified World network participants aren’t competing with bots for inclusion, instead they are guaranteed priority access to ensure reliable transaction inclusion during periods of congestion.
To ensure open access and verifiability, PBH is fully open source and implemented in the World Chain Block Builder, which integrates with Rollup Boost to enable block production on World Chain Mainnet. The World Chain Builder is built on top of Reth, a modern Ethereum execution client written in Rust, offering top-tier performance and a clean, modular architecture that’s well suited for custom block building. While building the World Chain Builder and PBH, TFH has helped drive the development of Rollup Boost as a core developer alongside Flashbots. This work around Rollup Boost not only enables PBH but also unlocks new and exciting possibilities for custom block building across the OP Stack.
PBH is running in production today on World Chain Mainnet, ensuring that verified World ID holders’ transactions are included without delay, even when the network is under high demand. This is a foundational shift: for the first time, real human transactions are given built-in priority during block production.
“Blockchains are getting faster and cheaper—but also less human. As bots and agents increasingly compete with humans onchain, World ID and PBH are emerging as essential infrastructure for a decentralized, human internet. To enable this new class of human-first blockspace, Tools for Humanity and Flashbots jointly built Rollup Boost—a verifiable pipeline for block construction. Entirely open source and production-ready, this marks a major step forward for putting humans back at the center of blockchains and the internet.“ - Daniel Marzec, Protocol Architect, Flashbots
Technical Foundation
Rollup Boost acts as a modular sidecar for OP Stack chains that enables external block builders to produce blocks with custom transaction ordering policies, optimized block construction logic and other extensions, all while remaining fully compatible with the OP Stack. With PBH, World Chain now provides a top-tier slot for human-verified transactions, ensuring that services like World ID verifications, resource claims and Mini App interactions remain fast and dependable.
Read more on the architecture here: Introducing Rollup Boost
World Chain Builder, PBH and Rollup Boost have each been independently audited by Nethermind to help ensure correctness, security, and reliability ahead of mainnet deployment.
View the full audits here:
Built for the Human Economy
Since World Chain launched in October, it is now home to over 5 million monthly active wallets.
To support this growth, PBH will be deeply integrated into the World App Mini App ecosystem. For example, Mini Apps will be able to request a Proof of Human from users to ensure their transactions clear quickly and reliably.
Every new primitive for verified humans now benefits from PBH without any extra steps, a win for all participants in World Network, from developers to World ID holders.
PBH Infrastructure
This launch would not have been possible without incredible collaboration. In addition to Flashbots, Alchemy played a critical role in the testing, refinement, and rollout of PBH to mainnet as well as added PBH support to Rundler, their ERC-4337 bundler implementation written in Rust. As part of this effort, Alchemy and TFH conducted an extensive series of game day scenarios to simulate failure modes, exercise recovery mechanisms and validate system behavior under heavy load. These tests helped surface remaining bugs, validate upgrade and rollback safety, and confirm that observability and operational tooling functioned as intended. Alchemy was instrumental in helping evaluate readiness in Rollup Boost, the World Chain Builder and PBH, giving us confidence in the system’s performance, safety, and reliability at launch.
The World protocol is fully open source and PBH is no exception. Users and other protocol teams can explore the repos powering PBH here:
In addition, the TFH protocol team will be attending EthCC in Cannes. If you’re planning to be there, come say hello! We’d love to talk more about PBH, Rollup Boost, and what’s next for human-first infrastructure.
“Priority Blockspace for Humans is a winning moment for humans onchain. Verifiable humanness, gas-free transactions, and ultra-reliable infrastructure. From testnet to mainnet, we worked closely with the TFH team to ensure a seamless, high-performance experience for real users. When our customers are building something this impactful, we're all-in on making it work.” — Jonathan Kau, Product Lead, Rollups at Alchemy
Learn more
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