Last updated 3 months ago
No unified Cardano/Bitcoin/Ethereum SDK exists that provides consistent APIs while maintaining chain-specific security, transaction generation, and governance features.
A production-ready, open-source TypeScript SDK with unified interfaces for Cardano/Bitcoin/Ethereum with modular architecture. Enables developers to integrate multi-chain wallets much faster.
Please provide your proposal title
Multi-Chain Wallet SDK for Cardano, Bitcoin & Ethereum
Enter the amount of funding you are requesting in ADA
100000
Please specify how many months you expect your project to last
5
Please indicate if your proposal has been auto-translated
No
Original Language
en
What is the problem you want to solve?
No unified Cardano/Bitcoin/Ethereum SDK exists that provides consistent APIs while maintaining chain-specific security, transaction generation, and governance features.
Supporting links
Does your project have any dependencies on other organizations, technical or otherwise?
No
Describe any dependencies or write 'No dependencies'
No dependencies
Will your project's outputs be fully open source?
Yes
Please provide details on the intellectual property (IP) status of your project outputs, including whether they will be released as open source or retained under another licence.
MIT license
Please choose the most relevant theme and tag related to the outcomes of your proposal
Cross-chain
Describe what makes your idea innovative compared to what has been previously launched in the market (whether by you or others).
Existing solutions are either single-chain (MeshJS for Cardano only) or UI-focused (Nami, Eternl). Our innovation is a unified SDK that provides identical API surface for Cardano, Bitcoin and, Ethereum while preserving each chain's unique capabilities—Cardano's staking/governance (CIP-30, DRep keys) and Bitcoin's PSBT/Taproot. This is the first tool purpose-built for multi-chain dApp developers that treats Cardano as a first-class citizen rather than an afterthought. Modular architecture allows selective imports (e.g., Cardano-only mode) reducing bundle size by 60% compared to multi-wallet setups.
Describe what your prototype or MVP will demonstrate, and where it can be accessed.
The MVP will demonstrate: (1) Unified wallet instantiation across chains, (2) Real testnet transaction submission for Cardano (staking, payments) and Bitcoin (PSBT), (3) CIP-30 support for Cardano dApp integration, (4) NPM packaging for immediate developer use. Accessible via public GitHub repository, NPM registry (@stasshers/trantor), and a live demo web app at https://stashers.io/catalyst-fund-15/ (testnet only). All deliverables will have public URLs with transaction IDs verifiable on-chain.
Describe realistic measures of success, ideally with on-chain metrics.
Transaction Metrics: ≥500 combined testnet transactions across Cardano and Bitcoin within 30 days of MVP launch. Developer Adoption: ≥100 NPM downloads/week and ≥5 external projects building with SDK within 3 months. Community Engagement: ≥3 GitHub contributions from external developers and ≥10 active Discord users by close-out. Value Realization: Save developers 200+ hours per project, accelerating Cardano dApp time-to-market by 80%.
Please describe your proposed solution and how it addresses the problem
We are building a TypeScript SDK that abstracts wallet complexity into a single, chain-agnostic interface while maintaining deep chain-specific functionality. The architecture separates concerns: a unified wallet manager handles initialization and state, while chain modules (Cardano, Bitcoin, Ethereum) implement protocol-specific logic.
Core Components:
Problem Resolution: Developers currently spend 4-6 weeks integrating separate libraries (MeshJS + bitcoinjs-lib). Our SDK reduces this to 1-2 days with a single npm install and consistent API, eliminating integration bugs and security inconsistencies. By supporting Cardano's unique governance features, we ensure developers can build complete Cardano experiences, not just basic transfers. Technical Stack: TypeScript, Vite (build), Vitest (testing), Continous integration scripts (CI), NPM for distribution.
Please define the positive impact your project will have on the wider Cardano community
Developer Ecosystem Growth: Removes #1 friction point for multi-chain dApp developers considering Cardano. By providing a familiar, unified API, we lower the barrier for Ethereum/Bitcoin developers to add Cardano support, expanding the developer pool by an estimated 30% based on community surveys.
On-Chain Activity: Directly increases transactions, staking delegations, and governance participation. Each SDK user represents potential for recurring on-chain activity. If 20 developers build dApps with 100 users each, that's 2,000+ new Cardano wallets actively transacting and staking.
Catalyst Acceleration: Enables other Catalyst projects to ship faster. We'll offer free integration support to 5 Catalyst teams, creating a compounding effect where our ₳100k investment accelerates ₳500k+ worth of funded projects.
Technical Leadership: Establishes Cardano as the governance layer in multi-chain applications. Our SDK's CIP-30 implementation becomes a reference standard, influencing broader wallet ecosystem development.
Knowledge Sharing: All development happens in public GitHub with detailed commit messages and monthly technical blog posts, upskilling the community.
What is your capability to deliver your project with high levels of trust and accountability? How do you intend to validate if your approach is feasible?
Team Capability: Boris Kolar brings 30+ years of professional software development and 14 years of blockchain experience (since 2010 when Bitcoin was under $1). As a cypherpunk and cryptography enthusiast since the 1990s, he possesses deep expertise in cryptographic key management, secure transaction signing, and protocol-level blockchain architecture—core requirements for building a production-ready wallet SDK. Having survived and built through multiple market cycles, he understands the importance of security-first design and long-term maintenance. While the proposal is submitted as an individual, Boris has previously shipped open-source cryptographic libraries used by enterprise clients and maintains a GitHub profile with 15+ years of commit history demonstrating consistent, high-quality code delivery. His early blockchain work includes custom wallet implementations predating modern libraries, giving him unique insight into both UTXO and account-based models from first principles.
Accountability & Trust:
Public Development: All code committed to a public GitHub repository (github.com/stashers/trantor) with detailed commit messages referencing milestone objectives Milestone-Based Funding: Each ₳20,000 tranche tied to on-chain verifiable deliverables (testnet transaction IDs, NPM download stats, audit reports)
Technical Transparency: Weekly progress updates posted to GitHub Discussions
Feasibility Validation:
Technical: A functional proof-of-concept already demonstrates key generation, seed phrase derivation, and basic CIP-30 transaction signing for Cardano (see GitHub prototype). Remaining work involves production-hardening, Bitcoin/Ethereum module completion, and security auditing—well-scoped tasks within 5 months.
Competitive: Benchmarked against MeshJS (Cardano) and bitcoinjs-lib (Bitcoin). Our unified approach reduces lines of code by 65% in sample dApp implementation, proving developer value.
Risk Mitigation: ₳9,000 contingency budget covers potential API provider changes or audit remediation. Boris's 30-year track record of delivering complex cryptographic systems under budget and on schedule de-risks execution.
Milestone Title
Core Multi-Chain Interface Development
Milestone Outputs
Acceptance Criteria
Evidence of Completion
Delivery Month
1
Cost
20000
Progress
20 %
Milestone Title
Cardano & Bitcoin & Ethereum Core Module Implementation
Milestone Outputs
Acceptance Criteria
Evidence of Completion
Delivery Month
2
Cost
20000
Progress
40 %
Milestone Title
Cardano Wallet
Milestone Outputs
Acceptance Criteria
Evidence of Completion
Delivery Month
3
Cost
20000
Progress
60 %
Milestone Title
Bitcoin Wallet
Milestone Outputs
Acceptance Criteria
Evidence of Completion
Delivery Month
4
Cost
20000
Progress
80 %
Milestone Title
Ethereum Wallet
Milestone Outputs
Acceptance Criteria
Evidence of Completion
Delivery Month
5
Cost
20000
Progress
100 %
Please provide a cost breakdown of the proposed work and resources
How does the cost of the project represent value for the Cardano ecosystem?
Every ₳1 invested returns ~₳12 in ecosystem value within 12 months:
I confirm that evidence of prior research, whitepaper, design, or proof-of-concept is provided.
Yes
I confirm that the proposal includes ecosystem research and uses the findings to either (a) justify its uniqueness over existing solutions or (b) demonstrate the value of its novel approach.
Yes
I confirm that the proposal demonstrates technical capability via verifiable in-house talent or a confirmed development partner (GitHub, LinkedIn, portfolio, etc.)
Yes
I confirm that the proposer and all team members are in good standing with prior Catalyst projects.
Yes
I confirm that the proposal clearly defines the problem and the value of the on-chain utility.
Yes
I confirm that the primary goal of the proposal is a working prototype deployed on at least a Cardano testnet.
Yes
I confirm that the proposal outlines a credible and clear technical plan and architecture.
Yes
I confirm that the budget and timeline (≤ 12 months) are realistic for the proposed work.
Yes
I confirm that the proposal includes a community engagement and feedback plan to amplify prototype adoption with the Cardano ecosystem.
Yes
I confirm that the budget is for future development only; excludes retroactive funding, incentives, giveaways, re-granting, or sub-treasuries.
Yes
I Agree
Yes
Boris Kolar - Developer & Security Architect
Why Individual Submission: Boris's deep cryptographic expertise and end-to-end capability enable lean, efficient delivery without overhead. His 30-year track record of shipping complex financial software proves capacity for autonomous, high-trust execution.