Grant Application: CUBID Protocol – Decentralized Identity + Embedded Wallet Infrastructure for Ethereum

Project Name

CUBID Protocol

Project Tagline

Modular, privacy-preserving identity and wallet infrastructure for the next generation of web3 apps.

Project Description

Cubid Protocol is a foundational layer for building on-chain identity and wallet experiences that are secure, composable, and developer-friendly. It provides:

1. Cubid Passport — a decentralized identity layer where users build a persistent, stamp-based identity graph. Users collect “stamps” (verifiable credentials) tied to wallet addresses, achievements, social proofs, and real-world affiliations. This identity graph is privacy-preserving, interoperable, and portable across the Ethereum ecosystem.

2. Cubid Embedded Wallet SDK — a flexible, app-scoped wallet system that gives developers the ability to let users:

   • Connect an existing wallet (via WalletConnect or RainbowKit)
   • Create a non-custodial embedded wallet using Shamir’s Secret Sharing (2-of-3 key management) without ever needing to save or manage a seed phrase.
   • Share their Human-score and any associated information related to the individual stamps.

Together, these tools empower developers to safely onboard new users, build trust-based access systems, and create meaningful web3 UX for real people—not just power users.

How the Project Strengthens Ethereum’s Infrastructure

Cubid addresses two critical needs for Ethereum’s long-term scalability and usability:

1. Decentralized Identity Infrastructure

Cubid Passport is an open, composable identity layer that gives users a way to build a persistent, cross-dapp reputation without centralizing control. It enables:

• Sybil resistance through composable stamps
• Access control and governance based on identity, not just tokens
• Verifiable humanity scores, integrations with verification providers like GoodDollar, BrightID, Idena, etc.
• Trust scoring for DAOs, marketplaces, and reputation-based apps

It helps Ethereum move beyond wallet = user, and toward identity = user.

2. User-Owned Wallet Infrastructure

The Cubid Embedded Wallet SDK gives developers a robust toolkit to onboard users who:

• Don’t have wallets
• Don’t want to deal with seed phrases or custody complexity
• Are coming from web2 or mobile-first environments

Using a 2-of-3 Shamir Secret Sharing approach, Cubid creates non-custodial app-scoped wallets where:

• One key share is stored locally on the user’s device
• One is encrypted and stored by the app
• One is stored securely via the Cubid secret manager

This system supports account recovery, app-scoped control, and UX upgrades—all while remaining fully trustless and private.

Open Source Commitment

Cubid is fully open-source and committed to the core values of Ethereum: decentralization, privacy, sovereignty, and modularity.

• Code is published under a permissive open-source license
• All SDKs and smart contracts are documented and available for developers to fork, extend, or build with
• The project is community-aligned and welcomes contributors, audits, and public feedback

Core Contributions to the Ethereum Ecosystem

• Identity Layer: Provides a portable, verifiable on-chain identity stack to replace centralized authentication or siloed logins
• Wallet Onboarding: Reduces friction for new users and mobile-first flows, helping Ethereum scale beyond experienced users
• Privacy-Preserving Key Management: Supports seedless wallet creation without compromising custody or sovereignty
• Sybil Resistance & Reputation: Enables new forms of access control, voting, and community trust on Ethereum
• Developer Tooling: Provides plug-and-play SDKs for dApps and DAOs to integrate identity, wallets, and access layers with minimal setup

Alignment with Grant Round Priorities

This proposal aligns with the goals of the Ethereum Infrastructure Round in the following ways:

• Decentralized Identity: Cubid Passport directly enhances Ethereum’s ability to manage user identity in a decentralized, interoperable way.
• User Experience & Onboarding: Cubid Embedded Wallet SDK reduces onboarding complexity and makes web3 more accessible to the next billion users.
• Privacy & Security: The 2-of-3 Shamir-based key splitting approach provides strong user protection without introducing centralized custody or insecure recovery flows.
• Privacy & Security: Users are in full control of what information to share or not share with any dApp.
• Open Source Infrastructure: All components are open-source, modular, and permissionless to adopt.

Roadmap (Next 3–6 Months)

• Launch v2 of the Cubid Embedded Wallet SDK with improved support for app-scoped wallets, better recovery UX, mobile-first flows, and enhanced management of Blacklisted vs. Greylisted stamps (=Sybil attacks)
• Expand Cubid Passport integrations with additional verification providers, DAOs, and access-controlled apps
• Publish detailed developer documentation and onboarding guides
• Release stamp explorer UI and dashboard for users to manage identity across apps
• Begin outreach and integration partnerships with builders in identity, gaming, social, DeFi, and coordination tooling

Success Metrics

• 10+ dApps integrating Cubid SDKs within 6 months
• 5,000+ Cubid Passports created, with active stamps
• 3+ integrations using Cubid humanity score or stamps for access or governance
• 500+ embedded wallets created without seed phrases
• Community contributions to the SDK, UI, or core contracts

Team & Contributors

Cubid is being built by a small, experienced team of Ethereum-native developers, privacy advocates, and UX designers. The project is independently developed and self-funded to date, with a track record of open-source contributions and identity-focused infrastructure work. We are now seeking support from the Ethereum community to accelerate development and scale adoption.

Funding Use

Funding from this round will support:

• Core protocol and SDK development
• Wallet recovery flow implementation
• UI and dashboard tooling for identity management
• Developer documentation, testing, and deployment
• Ecosystem integrations and partnerships

Closing

CUBID Protocol is building core identity and onboarding infrastructure that Ethereum needs to reach real users at scale. By combining modular identity with embedded wallets, Cubid gives developers the power to build safer, smarter, and more human-centered experiences—without compromising the principles Ethereum stands for.

We’re excited to contribute this layer to the ecosystem and welcome your support.