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Worldcoin and the World ID protocol

by Sophie Smith

The Worldcoin (WLD) state bridge revolution is pushing Web3 and crypto closer together, creating a more interconnected and inclusive future. The innovative state bridge technology from Worldcoin allows developers to seamlessly connect their innovations with the World ID protocol and EVM-compatible chains.

One of the biggest challenges in the crypto and Web3 realm has been accessibility and integration. Worldcoin is addressing these challenges by implementing a new State Bridge. This opens the door for developers to integrate their solutions with the World ID protocol and EVM-compatible blockchains, which is a game-changer for the Web3 landscape.

State bridges play a crucial role in enabling interoperability between different blockchains. They facilitate the seamless transfer of data between chains, breaking down the silos that can hinder the growth of the Web3 ecosystem. In the case of Worldcoin, state bridges allow the sharing of the current state of World ID contracts with other chains, allowing developers to leverage the power of proof of personhood in Layer 2 solutions, sidechains, and beyond.

At the heart of Worldcoin’s innovation is the World ID protocol, represented as a Merkle tree on the Ethereum blockchain. Each leaf of the tree represents a unique identity, and the root of the Merkle tree generates and validates zero-knowledge proofs (ZK proofs). These proofs form the foundation of a privacy-preserving identity primitive with a wide range of use cases.

Worldcoin’s State Bridge architecture has evolved to address limitations in the previous version. The updated architecture introduces a modular, permission-free, and gas-efficient design. Root propagation is now decoupled from identity insertion, allowing more efficient insertion of new identities. State bridge propagation is permit-free, enabling anyone to propagate roots without restriction. Individual state bridges are separated, allowing more frequent propagation of roots on specific chains as needed.

The updated state bridge architecture enables developers to deploy their state bridges for chains not yet supported by Worldcoin. This opens up the possibility of personality testing on any EVM-compatible chain. Several methods, such as Optimism’s CrossDomainMessenger, Scroll’s ScrollMessenger, and Arbitrum’s Inbox, facilitate communication between layer 1 and layer 2. Other methods, like storage evidence and storage proofs with protocols such as Axiom and Herodotus, can also be leveraged.

Worldcoin is actively developing tools, including a state-bridge-service and a tree-availability-service, to support root bridging and the creation of inclusion proofs for any EVM-compatible chain. These tools will further enhance Web3 accessibility in the coming weeks.

Security and quality are of utmost importance to Worldcoin. The protocol undergoes thorough security assessments by audit vendors to ensure its robustness and integrity. Engagements with audit firms like Least Authority and Nethermind assess the off-chain and on-chain components of the protocol, including blockchain, cryptography, and smart contract technologies.

In conclusion, Worldcoin’s new state bridge is a significant step towards improving the accessibility and integration of Web3 solutions. By allowing developers to create their own state bridges, Worldcoin contributes to the broader Web3 ecosystem. The evolving Web3 landscape is becoming more inclusive and interconnected, with state bridges acting as crucial gateways to a decentralized future. Worldcoin is at the forefront of shaping that future, and their protocol whitepaper provides a detailed description of their project for those interested in learning more.

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