[Proposal setup] Proposal title

Please provide your proposal title

Anvil - Semi-Custodial Wallet: Enterprise ready Wallet SDK

[Proposal Summary] Budget Information

Enter the amount of funding you are requesting in ADA

60000

[Proposal Summary] Time

Please specify how many months you expect your project to last

7

[Proposal Summary] Translation Information

Please indicate if your proposal has been auto-translated

No

Original Language

en

[Proposal Summary] Problem Statement

What is the problem you want to solve?

Seed phrases and wallet UX block mainstream adoption; dApps lose users at onboarding.

[Proposal Summary] Supporting Documentation

Supporting links

• https://github.com/Cardano-Forge
,
• https://ada-anvil.io/
,
• https://dev.ada-anvil.io/

[Proposal Summary] Project Dependencies

Does your project have any dependencies on other organizations, technical or otherwise?

No

Describe any dependencies or write 'No dependencies'

No dependencies

[Proposal Summary] Project Open Source

Will your project's outputs be fully open source?

No

License and Additional Information

Closed-Source SDK

[Theme Selection] Theme

Please choose the most relevant theme and tag related to the outcomes of your proposal.

Wallet

[Campaign Category] Category Questions

Describe what makes your idea innovative compared to what has been previously funded (whether by you or others).

In our opinion, no previously funded ideas like this match the level of understanding and importance of a tool like this for Cardano adoption. We have multiple inbound clients who need an enterprise level, semi-custodial wallet option, to offer non-native crypto users an opportunity to use their dApp/app.

As a result of our work on the C-hub project (Project ID1300022), we determined it was a logical progression to expand this into a product as we see it as a viable enterprise tool, which tears down the traditional complications of wallets entriely.

Describe what your prototype or MVP will demonstrate, and where it can be accessed.

Our MVP will deliver a semi-custodial Cardano wallet SDK for Web, iOS, and Android. Private keys stay securely bound to the user’s device (Keychain, Secure Enclave, Android Keystore, or WebCrypto), giving the convenience of a custodial wallet while remaining fully non-custodial. Developers will access the SDK through a simple API, with a dApp adapter that plugs into existing Cardano connectors (CIP-30/CIP-8). The MVP will include a demo DEX integration, sample apps, and a developer portal, allowing partners and beta testers to experience login-based onboarding and transaction signing.

Describe realistic measures of success, ideally with on-chain metrics.

• Onboarding drop-off reduced by 50%+ vs seed-phrase flows (A/B test on demo site).
• Time-to-first-transaction < 90 seconds from app open (median across 50 test runs).
• 3+ dApp pilots using the adapter within 3 months of beta.
• SDKs ship with reference integration tests and CI matrices for Web/iOS/Android.
• 100% of beta partners able to integrate without storing a seed phrase; keys remain device-bound in audits.

[Your Project and Solution] Solution

Please describe your proposed solution and how it addresses the problem

Login, Not Seed Phrases: Semi‑Custodial, Enterprise ready Wallet SDK for Web/iOS/Android

Track: Cardano Use Cases: Concept (closed-source)

Proposer: Anvil Development Agency Inc. — https://ada-anvil.io/team

Budget ask: 60,000 ADA

Duration: 6-7 months

Prior work: Weld (Fund11) — an open-source universal wallet connector for Cardano (https://projectcatalyst.io/funds/11/cardano-open-developers/anvil-open-source-universal-wallet-connector))

Executive Summary

Seed phrases and traditional wallet setup block mainstream adoption. We will deliver a semi-custodial, cross-platform SDK (Web, iOS, Android) that binds non-custodial keys to familiar logins (e.g., Sign in with Apple) using platform secure enclaves/keystores. dApps integrate a simple API that feels like a custodial wallet while users retain local key control (keys never leave the device). Includes a dApp adapter and reference integration path. Supports common Cardano patterns (CIP‑30 adapter compatibility and CIP‑8 signData where applicable).

Problem & Context

Seed phrases and wallet UX block mainstream adoption; dApps lose users at onboarding.

Solution & Scope

Non-custodial keys stored locally (WebCrypto, iOS Keychain/Secure Enclave, Android Keystore) tied to auth provider login (e.g., Apple).

Wallet behavior abstracted behind an API so dApps can integrate like a custodial wallet, while users retain control of keys.

Scope & Non-Goals

Scope: Cross-platform SDKs, auth bindings, signing/UTXO flows, dApp adapter, and reference server APIs for orchestration.

Non-Goals: Operating a custodial service, running production backends for customers, or shipping fiat ramps. The server reference is minimal and optional.

What we will deliver

• SDKs: Web, iOS, Android for account creation, recovery, signing, UTXO mgmt.
• Auth bindings (Apple login first), session flows, device binding, multi-device handoff.
• dApp adapter compatible with popular connectors (e.g., use on DEX UIs without seed phrase).
• Reference server APIs for orchestration (rate limits, fraud, push notifications) — minimal data, privacy-first.
• Threat model, security review summary, and platform-specific hardening guidance.

Licensing & Governance

• Closed-source SDK with published APIs and integration guide; consider dual-licensing for ecosystem partners.
• Security review summary and threat model published; versioned SDK contracts; deprecation policy.

Ecosystem Alignment & Interoperability

• Web adapter compatibility with CIP-30 wallets/connectors.
• signData (CIP-8) support where applicable for dApp flows.
• Cardano Serialization Lib (CSL) based transaction building for interoperability.

Auditability & Openness

• Public API documentation and example integration repos/snippets.
• CI status badges; test matrices for platforms; release notes and changelog.

Dependencies

• Web: WebCrypto, WebAuthn/Passkeys (optional)
• iOS: Keychain + Secure Enclave (where available), CryptoKit
• Android: Keystore (StrongBox where available)
• Cardano Serialization Lib (CSL)
• CIP-30 adapter compatibility (for web dApps)
• Optional: Anvil API for tx building; Blockfrost for network queries
• Optional: Push services for notifications (platform-native)

Community & adoption

• Early-access program with top dApps; integration support.
• Public roadmap and security review summary.

[Your Project and Solution] Impact

Please define the positive impact your project will have on the wider Cardano community

This project tackles one of the biggest adoption blockers in Cardano: seed phrases. By delivering a near-custodial wallet SDK for Web, iOS, and Android, we make onboarding as simple as “Sign in with Apple,” while keeping keys fully non-custodial and device-bound. This lowers drop-off rates, accelerates time-to-transaction, and enables dApps to integrate users in under 90 seconds.

The impact to the community is significant: developers can build new consumer-friendly wallets without the burden of seed phrase UX, exchanges and DeFi apps can onboard thousands of users faster, and enterprise teams can integrate Cardano without maintaining custody infrastructure. The SDK can power wallets optimized for retail users, white-label fintech integrations, and high-volume transaction systems such as DEXs or NFT platforms.

By reducing onboarding friction and enabling enterprise-ready wallet flows, this project will increase transactional volume, strengthen dApp adoption, and position Cardano as a blockchain with the usability required for mainstream and enterprise adoption.

[Your Project and Solution] Capabilities & Feasibility

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?

Year after year, we increase our visibility and notareiety in the Cardano develoment space. At Anvil, we have set out to be trailblazers of Cardano, and diminish the gap between web2 and web3. We create our solutions with every developer in mind and we pride ourselves in the work we do under these community grants. We know our approach is feasible because we have internal consensus as a team and firmly believe in this product.

From our conversations with clients this is a must have item in the Cardano ecosystem and this funding will allow us to create not only a solution we would use, but the entire Cardano community can.

[Milestones] Project Milestones

Milestone Title

Core Architecture, Threat Model, SDK Foundations & Auth Integration

Milestone Outputs

Outputs:

• Delivery of the complete system architecture and threat model documentation, initial SDK scaffolds across Web, iOS, and Android, and working integration of Apple login with secure key binding.
• Includes negative tests for failed authentication, ensuring persistence of keys across app restarts, and laying the foundation for secure cross-platform wallet operations.

Acceptance Criteria

Acceptance:

• Publicly available repo scaffolds with passing builds
• Threat model and security review summary published
• Apple login demo functioning on Web and iOS
• Automated tests confirm key persistence and expected failure handling

Evidence of Completion

Completion:

• Link to Video showing demo functionality
• Link to Test Results
• Link to Repository

Delivery Month

2

Cost

20000

Progress

30 %

Milestone Title

Key Management, Transaction Signing, and Secure Storage

Milestone Outputs

Outputs:

• Fully implemented key management and transaction signing flows across platforms.
• Keys securely stored in native keystores (WebCrypto, iOS Secure Enclave, Android Keystore).
• Functional send/receive flows on testnet, along with unit tests validating persistence and negative cases for invalid signing.
• Recovery flows remain feature-flagged until Milestone 4.

Acceptance Criteria

Acceptance:

• Transaction signing verified on Web, iOS, and Android
• Keystore persistence validated via automated tests
• Sample app demonstrates send/receive transactions on testnet
• CI pipelines confirm signing flows function consistently across platforms

Evidence of Completion

Completion:

• Link to Video showing transaction signing, send/receive transactions on test, and signal flows/tests
• Link to Signed Transaction

Delivery Month

3

Cost

7000

Progress

40 %

Milestone Title

dApp Adapter, Integration Tests, Recovery & Device Linking

Milestone Outputs

Outputs:

• Creation of a CIP-30 compatible dApp adapter enabling seamless connect/sign flows
• Includes full integration testing with at least one DEX demo, coverage of CIP-8 signData where applicable, and API documentation
• Recovery mechanisms (e.g., second factor), device linking/unlinking, minimal orchestration server APIs (rate limits, fraud prevention, telemetry) also implemented with privacy-first principles

Acceptance Criteria

Acceptance:

• dApp adapter enables working connect/sign flows in demo DEX integration
• API documentation available for developers
• CI integration tests passing, including negative scenarios
• Recovery and device linking validated through demo flows
• Privacy impact assessment updated.

Evidence of Completion

Completion:

• Link to Video showing dApp enabler, DEX integration, demo flows, and tests passing
• Link to SDK documentation
• Link to Privacy impact assesment

Delivery Month

5

Cost

13000

Progress

70 %

Milestone Title

Documentation, Developer Portal & Private Beta, and Final Close-out Report/Video

Milestone Outputs

Outputs:

• Comprehensive documentation including developer guides, migration and integration examples, and cookbook recipes
• Launch of a developer portal with SDK distribution channels, usage guides, and CI-validated examples
• Private beta program with 3 partner dApps onboarded, collecting structured feedback to validate usability and readiness for broader adoption
• Final Close-out Report/Video

Acceptance Criteria

Acceptance:

• Developer portal live with SDK docs, examples, and guides published
• SDK packages distributed for Web/iOS/Android
• At least 3 partner dApps successfully integrated into private beta with signed feedback confirming end-to-end wallet flows function without seed phrases.
• Final Close-out Report/Video completed

Evidence of Completion

Completion:

• Link to Developer portal
• Link to Signed Feedback forms
• Link to Close-out Report/Video

Delivery Month

7

Cost

20000

Progress

100 %

[Final Pitch] Budget & Costs

Please provide a cost breakdown of the proposed work and resources

Total Budget: 60,000 ADA

• Cross-Platform SDKs — 27,000 ADA
  • Web SDK development: 10,000 ADA
    • Account creation, key binding, signing flows
    • Integration with WebCrypto & Passkeys
    • Unit tests, CI pipelines, and sample app
  • iOS SDK development: 9,000 ADA
    • Secure Enclave + Keychain integration
    • Transaction signing & UTXO management
    • Unit tests, CI pipelines, and example app
  • Android SDK development: 8,000 ADA
    • Keystore & StrongBox integration
    • Transaction signing & UTXO management
    • Unit tests, CI pipelines, and example app
• Auth Bindings + Recovery Flows — 12,000 ADA
  • Auth provider integration (Apple login first): 6,000 ADA
    • Session management and device binding
    • Negative tests for failed auth scenarios
    • Cross-platform persistence validation
  • Recovery & multi-device linking: 6,000 ADA
    • Second-factor / social recovery flows
    • Device link/unlink functionality
    • Privacy-first telemetry and minimal orchestration server stubs
• dApp Adapter + Demos — 12,000 ADA
  • dApp adapter (CIP-30 & CIP-8 support): 8,000 ADA
    • Adapter API design and implementation
    • Integration testing with at least one DEX demo
    • CI validation and automated negative tests
  • Demo & example applications: 4,000 ADA
    • Showcase integration flows
    • Provide golden tests and reference implementations
    • Documentation and integration examples for developers
• Documentation, Developer Portal & Beta Operations — 9,000 ADA
  • Developer documentation & guides: 4,000 ADA
    • API references, migration guides, cookbook recipes
    • Platform-specific SDK usage instructions
    • Security review summary and threat model
  • Developer portal & private beta program: 5,000 ADA
    • SDK distribution, versioning, and CI-validated examples
    • Onboarding 3 partner dApps for private beta
    • Feedback collection and usability validation

[Final Pitch] Value for Money

How does the cost of the project represent value for the Cardano ecosystem?

This proposal represents excellent value for the Cardano ecosystem by delivering a near-custodial, cross-platform wallet SDK that directly addresses one of the most significant barriers to mainstream adoption: complex seed phrase management.

For a total budget of 60,000 ADA, the project will produce fully functional Web, iOS, and Android SDKs, a developer-friendly dApp adapter compatible with CIP‑30 and CIP‑8 standards, recovery and device linking flows, and comprehensive developer documentation. This toolkit enables dApp teams to integrate wallet functionality with minimal friction, accelerating onboarding, reducing drop-off by over 50%, and supporting rapid transaction flow across pilot applications. By providing secure, device-bound key management without custodial compromise, the SDK supports both enterprise-ready applications and consumer-facing wallets, fostering higher transactional volume, broader user adoption, and ecosystem-wide interoperability. Anvil is going to deliver an Enterprise ready solution that will permanently ease the gap between web3 technologies and web2 apps.

[Required Acknowledgements] Consent & Confirmation

Terms and Conditions:

Yes