Proposal: Bitcoin Inheritance & Custody dApp – JXLabs

Grants & Incentives
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We’re submitting this proposal on behalf of JX Labs. Feedback is welcome!

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Executive Summary

This proposal presents the development of a Bitcoin-native inheritance and custody dApp by JXLabs, an independent R&D unit within Jonxsoft. The document outlines the mission, product architecture, team background, current progress, and roadmap of the project. The solution is designed to run on Rootstock, leveraging its smart contract infrastructure to deliver decentralized, secure, and automated inheritance functionality for long-term Bitcoin holders.

Our goal is to receive a development grant to accelerate the next stages of the project and contribute meaningfully to the Rootstock ecosystem.

We aim to deliver a critical piece of infrastructure that brings new utility to Bitcoin holders and showcases the power of Rootstock’s smart contract layer.

Company Description

Jonxsoft is a company founded in 2014, specialized in software consulting and development using Microsoft technologies. With a solid track record in the implementation of Microsoft ERP systems, Jonxsoft has delivered efficient solutions for companies seeking to optimize their operations through advanced enterprise management tools.

In addition to system implementation, Jonxsoft offers custom software development, integrations, and interface development services, with strong expertise in technologies such as C#, Java, and .NET. The company has positioned itself as a strategic partner for organizations requiring tailored technological solutions, ensuring high quality and efficiency in every project.

In 2024, Jonxsoft expanded its technological vision with the creation of JXLabs, an independent unit dedicated exclusively to the research and development of solutions built on Bitcoin.

JXLabs focuses on designing decentralized applications (dApps), smart custody mechanisms, and native Bitcoin protocols that extend the functionality of the network. With a strong commitment to security, sovereignty, and innovation, JXLabs builds tools that empower individuals and remain true to Bitcoin’s foundational principles.
https://jxlabs.xyz/

Project Mission

At JXLabs, our mission is to solve one of the most critical gaps in the Bitcoin ecosystem: inheritance and long-term custody.

We are building a decentralized, non-custodial dApp on Rootstock to enable secure and automated inheritance of Bitcoin assets — ensuring that BTC is never lost due to death, incapacity, or key mismanagement.

By leveraging Rootstock’s smart contract capabilities, our solution maintains:

  • Bitcoin’s trustless and censorship-resistant principles
  • Complete user sovereignty and self-custody
  • Programmed conditions for triggering inheritance or recovery events

This project aims to bring real-world utility to Bitcoin long-term holders, helping families recover assets securely, without relying on lawyers, custodians, or centralized entities.

Rootstock provides the perfect environment to build this, combining Bitcoin’s security with EVM compatibility and scalability. We’re proud to contribute to the RSK ecosystem with a dApp that reinforces Bitcoin’s role as a long-term, sovereign store of value — across generations.

Product Details

The Bitcoin Inheritance & Custody dApp is a non-custodial, decentralized smart contract system deployed on Rootstock (RSK) that enables secure and automated transfer of Bitcoin ownership under predefined conditions, such as death, incapacitation, or loss of access.

:small_orange_diamond: Architecture Overview

  • Smart Contracts are written in Solidity and deployed on the RSK Virtual Machine (RVM), ensuring full EVM compatibility.
  • Trigger Logic: The system uses timelocks, heartbeats, and inactivity detection to trigger automated fund release processes.
  • BTC Custody Layer: BTC is held via a smart contract wrapper using RBTC, Rootstock’s native asset pegged 1:1 to Bitcoin.
  • Recovery Mechanism: A programmable recovery pathway allows for funds to be sent to predefined beneficiaries after validation of inactivity or an off-chain signal.

:small_orange_diamond: Key Components

1. Vault Contract
* Holds the RBTC in a trustless, non-custodial manner.
* Includes configurable parameters for timeout duration, backup addresses, and recovery logic.

2. Heartbeat Mechanism
* Users must periodically sign a transaction to prove they are still in control.
* Failure to send a heartbeat within the defined time frame will initiate the recovery process.

3. Recovery Contract
* Governs the transfer of funds to heirs or backup wallets based on the rules set at contract creation.
* Uses time-based conditions and optional multi-sig confirmation from pre-approved verifiers (optional module).

4. User Interface (dApp Frontend)
* Developed with React + Web3 integration.
* Allows users to deploy and configure their own custody contracts, set backup addresses, view contract status, and manage heartbeats.
* Compatible with wallets like MetaMask (via RSK network) and hardware wallets (Ledger/Trezor with RBTC support).

:small_orange_diamond: Security Considerations

  • Contracts are fully auditable and open-source.
  • Failsafe mechanisms prevent premature or unauthorized fund release.
  • Designed with modularity in mind for future integration with decentralized oracles, RIF Identity, and multi-sig layers.

:small_orange_diamond: Integration with Rootstock

  • By leveraging RSK’s merge-mining security and RBTC, the dApp ensures Bitcoin-grade reliability.
  • Rootstock allows us to bring smart contract logic to Bitcoin without leaving the Bitcoin ecosystem.
  • Future phases include optional integration with RIF Identity for secure beneficiary verification.

Team Information

JXLabs is led by a multidisciplinary team with strong technical expertise in blockchain development, smart contract engineering, and user-focused design. Our mission-driven approach is rooted in Bitcoin’s values of sovereignty, decentralization, and security.

Jonathan Bravetti
CEO & Solutions Architect
Founder of Jonxsoft and JXLabs. With over 15 years of experience in enterprise software, systems architecture, and Cryptographic integrations, Jonathan leads both the strategic vision and technical execution of the lab. His focus is on designing robust, decentralized solutions that adhere to the core principles of Bitcoin — sovereignty, transparency, and security.

Nahuel Castro
Systems Engineer – Software Development & Technical Leadership
Systems Engineer with over 10 years of experience in software development, systems integration, and technical project management.
He has led multiple development teams and projects across various industries, combining deep technical expertise with a strong leadership mindset. At JXLabs, Nahuel contributes to the overall architecture, planning, and implementation of secure and scalable blockchain-based solutions.

Agustin Ross
Systems Engineer – Full Stack Development
Systems Engineer with a strong focus on software development and full stack technologies.
He has solid experience building modern web applications, working across both frontend and backend layers with a deep understanding of system architecture and user experience. At JXLabs, Agustin contributes to the development of decentralized applications, ensuring smooth integration between blockchain logic and user-facing components.

Elias Dominguez
Systems Technician – Backend Development & Deployments
Systems Technician with strong technical skills in backend development, systems integration, and deployment workflows.
He has hands-on experience supporting development teams in building scalable applications, managing test environments, and ensuring smooth CI/CD processes. At JXLabs, Elias supports backend operations, testing routines, and deployment pipelines to maintain development agility and reliability.

Jessica Rubira
Licensed Publicist – Communications & Branding
Jessica oversees the project’s visual identity, brand messaging, and communication strategy. She ensures that JXLabs communicates clearly and consistently, with a focus on education, transparency, and trust in the Bitcoin space.

Progress So Far in the Project

Since the beginning of November 2024, our team has been working consistently on research, architecture, and the early development of the Bitcoin Inheritance & Custody dApp. Below is a summary of our progress to date:

Research & Concept Validation

  • Completed a technical and legal feasibility study of inheritance mechanisms within the Bitcoin ecosystem.
  • Identified the main design challenges: security, false trigger prevention, and user experience in a non-custodial context.
  • Evaluated multiple Layer 2 options and selected Rootstock (RSK) for its EVM compatibility, merge-mined security, and Bitcoin-native RBTC asset.

Smart Contract Development

  • Developed the initial Vault Contract in Solidity, supporting:
  • Configurable timelocks and heartbeat intervals
  • Heir address assignment
  • Inactivity-triggered recovery logic
  • Currently working on modularizing the logic for extensibility and integrating recovery conditions.

Frontend & User Interaction
Not yet started.

  • The frontend layer is scheduled for the next development phase.
  • It will include wallet connection (MetaMask over RSK), contract deployment UI, and heartbeat monitoring.

Testing & QA

Not yet started.

  • Contract testing and simulation in RSK testnet will begin once modular components are completed.

Community & Ecosystem Alignment

Coming soon

  • Initiated conversations with Rootstock’s ecosystem team to align on the project’s vision and integration.
  • Drafting initial documentation and preparing a public roadmap.
  • Beginning to identify early adopters and strategic partners within the Bitcoin and RSK communities.

Roadmap for the Future

Our roadmap is structured in phases to ensure the Bitcoin Inheritance & Custody dApp is built with maximum security, usability, and alignment with the Rootstock ecosystem.

Q2 2025 – Finalize Smart Contract Core

  • Finalize and modularize Vault and Heartbeat contracts.
  • Conduct internal security reviews and code optimizations.
  • Prepare contracts for testnet deployment.

Q3 2025 – Frontend Development & Testnet Integration

  • Build React-based frontend with Web3 + RBTC wallet support (MetaMask).
  • Enable users to deploy and configure contracts from the UI.
  • Integrate RSK testnet for live simulation of heartbeat and recovery flows.

Q4 2025 – Testing, Audit & Ecosystem Engagement

  • Begin comprehensive QA and test coverage.
  • Open-source core smart contracts on GitHub.
  • Initiate external code audit with a reputable third-party firm.
  • Collaborate with Rootstock and RIF teams for technical alignment.
  • Launch early access beta for selected users.

Q1 2026 – Mainnet Launch

  • Finalize production-ready dApp.
  • Deploy smart contracts to RSK mainnet.
  • Release full documentation and user onboarding materials.
  • Announce launch through ecosystem channels and community events.

Q2 2026 and Beyond – Ecosystem Integration

  • Explore RIF Identity integration for verified heir verification.
  • Add optional multi-sig and oracle-based extensions.
  • Develop inheritance planning toolkit for Bitcoiners.
  • Establish a small grant program to support related open-source tools.

Summary

JXLabs is building a Bitcoin-native inheritance and custody dApp that addresses one of the most overlooked but critical problems in the ecosystem: what happens to your BTC when you’re gone or incapacitated.

Our solution leverages Rootstock’s smart contract capabilities to provide a secure, decentralized, and automated way for users to ensure their Bitcoin is passed on according to their will — without relying on third parties, lawyers, or custodians.

We are:

  • 100% aligned with Bitcoin’s ethos of sovereignty and decentralization
  • Developing a non-custodial, auditable, and modular solution
  • Backed by a technical team with deep experience in blockchain systems
  • Committed to contributing to the Rootstock ecosystem as builders and long-term participants

We’re confident that with Rootstock’s support, we can bring this critical solution to Bitcoin holders worldwide, strengthening the ecosystem and unlocking new sovereign use cases for Bitcoin.

4 Likes
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Sounds great, hopefully it thrives.

2 Likes
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Thank you for the proposal @jxlabs - this is a cool idea and we can definitely see a need for a secure and decentralised Bitcoin inheritance solution.

We’re supportive of projects building valuable tools within the Rootstock ecosystem and keen to learn more about your go-to-market strategy; how you plan to reach and educate Bitcoin holders about this solution, but also interested in the current level of engagement with the broader Bitcoin community.

Some follow-up questions:

  1. What concrete steps will JXLabs take to actively engage with the broader Bitcoin community to drive awareness and adoption of this dApp?
  2. Could you please specify the amount of the development grant you are requesting?
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Thank you so much for the support and thoughtful feedback @Avantgarde

1. Community Engagement & Go-to-Market

At JXLabs, we believe education and community interaction are essential to driving real adoption—especially when building for Bitcoiners who deeply value sovereignty and security.

We plan to implement the following steps:

  • Weekly open workshops (in English and Spanish), focused on decentralized inheritance, custody risks, and how to use the dApp.
  • In-person events across Bitcoin-friendly hubs such as Buenos Aires, Montevideo, and Mexico City, in collaboration with local Bitcoin communities — with plans to expand our presence into key Bitcoin ecosystems in the US and Europe as the project progresses.
  • Presence in Bitcoin-focused podcasts, Twitter Spaces, and meetups to introduce the use case and engage directly with sovereign users.
  • Educational campaigns on platforms like Twitter/X, Nostr, and YouTube, including step-by-step guides and real-life scenarios.
  • Beta tester program with incentives, inviting Bitcoiners to test the dApp on RSK testnet and provide feedback.
  • Partnerships with Rootstock ecosystem players (e.g., Sovryn, Tropykus) for cross-promotion and extended visibility.

2. Grant Amount Requested

We are requesting a development grant of USD 30,000.

Our internal development team is already engaged and committed to delivering the technical side of the project. This allows us to strategically allocate the grant as follows:

  • 50% toward community outreach, education, and marketing, to ensure visibility and adoption within the broader Bitcoin ecosystem.
  • 50% to cover audit preparation, infrastructure, and development-related operational costs during the build and launch phases.

We believe this structure will allow us to deliver a secure, production-ready dApp while also ensuring that the solution reaches the broader Bitcoin community where it can provide real value.

We’re happy to clarify anything else and really appreciate the opportunity to contribute to the Rootstock ecosystem.

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Thanks to the @jxlabs team for a thoughtful and well-scoped proposal. The use case, decentralized Bitcoin inheritance, fills a real gap and aligns strongly with Rootstock’s mission. The technical foundation looks solid, the team is credible, and the budget is well justified.

I support this initiative. While milestone-based disbursements aren’t standard practice today in RC, it’s something worth considering for future grants. In the meantime, regular progress updates and closer engagement with ecosystem partners would be welcome.

Looking forward to seeing this develop.

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Thank you so much for your support and encouraging feedback!

We truly appreciate the thoughtful review and are excited to move forward with the project. The Rootstock ecosystem aligns perfectly with our technical and ideological vision, and we’re proud to contribute with a solution that empowers Bitcoin holders with more sovereignty, resilience, and long-term planning.

We fully understand the importance of transparency and collaboration. As development progresses, we’ll make sure to:

  • Provide regular public updates through the governance forum
  • Actively engage with Rootstock ecosystem teams and fellow builders
  • Share learnings, challenges, and milestones openly with the community

We’re deeply motivated to make this dApp a valuable piece of infrastructure for the Bitcoin space.

Looking forward to what’s ahead!

— The JXLabs team

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Update – April 2025

Hello Rootstock community!

As part of our commitment to transparency and ongoing engagement, we’re excited to share the latest progress on BΔLT (Bitcoin Autonomous Legacy Trust), our decentralized Bitcoin inheritance and custody dApp.

Marketing & Community Engagement

  • We launched and are actively growing our presence on X (@JXLabs), sharing insights about our mission at JX Labs and raising awareness about BΔLT.
  • We officially defined the name for our dApp: BΔLT - Bitcoin Autonomous Legacy Trust, aligning perfectly with our vision of sovereign, trustless Bitcoin inheritance.

Technical Development

  • Completed the full architecture design of BΔLT.
  • Developed and deployed the required smart contracts on Rootstock Testnet.
  • Built the backend services to interact with the smart contracts and successfully performed internal functional tests.
  • Developed an initial frontend prototype, integrated with MetaMask, and successfully completed end-to-end testing of the BΔLT flow.
  • The team is now focused on building the final version of the frontend and conducting more extensive testing and debugging.

Next Steps

  • Complete internal testing and release a Beta Tester Program, inviting community members to try out BΔLT and provide valuable feedback.
  • Collaborate with the Rootstock team for technical consultations and ecosystem alignment.

We’re excited about the progress made and remain committed to delivering a secure, decentralized inheritance solution that fully aligns with the Bitcoin ethos.

Thanks again to the Rootstock Collective and community for your ongoing support!

JXLabs Team

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Thanks for the update @jxlabs, really appreciate the transparency and consistent communication. It’s great to see solid progress both on the technical side and around ecosystem engagement.

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Update – June 2025

Hello Rootstock community,

We’re excited to share a major milestone in the development of BΔLT (Bitcoin Autonomous Legacy Trust) — our decentralized inheritance and custody solution built on Rootstock.

Project Status

We’re proud to report that development is now complete, including:

  • Smart contracts fully deployed on Rootstock Testnet.
  • Backend services fully integrated and tested.
  • Final version of the user interface is live and operational.
  • Full dApp flow has been tested successfully with MetaMask on Testnet.

You can now access the live testnet deployment here:

We’ve also made the smart contracts public on GitHub:

This puts us significantly ahead of our original roadmap as outlined in our initial grant proposal.

Next Steps

  • Next week, we will be publishing our functional and technical manuals, to help the community understand how BΔLT works and facilitate onboarding and testing.
  • In approximately 15 days, we will launch our Beta Tester Program, inviting community members to test BALT on testnet and provide feedback.
  • In August, we are preparing to launch the dApp on Rootstock Mainnet.
  • We also plan to collaborate with the Rootstock team for technical reviews and alignment during the rollout phase.

Grant Request

With BΔLT nearing mainnet readiness and the core development complete, we believe this is a good time to move forward with the formal submission of our grant proposal to the Rootstock Collective DAO.

We’d be happy to proceed with that step if the community and governance team consider it appropriate.

The grant will directly support:

  • Marketing and education campaigns leading up to and following the mainnet launch
  • Audit preparation to ensure security and reliability
  • Infrastructure and operational readiness

We’re also open to receiving the grant in milestone-based disbursements (e.g. 70/30) if preferred by the Rootstock Collective.

We remain fully committed to Rootstock’s mission and to delivering meaningful tools for Bitcoiners. Thank you again for your support and collaboration.

JXLabs Team

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Update – July 2025

Hello Rootstock community,

We’re happy to share this month’s update on BΔLT (Bitcoin Autonomous Legacy Trust)

Beta Testing Phase Has Started

BΔLT is now officially in Beta on the Rootstock Testnet.
We’ve opened up the dApp to early testers and invite the community to participate and share feedback.

To guide testers through the process, we’ve prepared a dedicated manual:

Beta Testing Guide:
https://jxlabs.xyz/BALT_BetaFlow_Enu.pdf

Whitepaper Now Available

As part of our commitment to openness and long-term vision, we’re also publishing the official whitepaper for BΔLT.

BΔLT Whitepaper:
https://jxlabs.xyz/BALT_Whitepaper.pdf

What’s Next

  • Continue gathering feedback from beta testers and iterate on UX and edge case handling
  • Begin internal audit preparations for the smart contracts
  • Finalize documentation for the mainnet launch scheduled for August 2025

In parallel, we’ll be submitting the formal grant request to become a whitelisted Builder in the Collective Rewards program, as we prepare BΔLT for mainnet launch and long-term contribution to the Rootstock ecosystem.

We thank the Rootstock community for the support and invite everyone interested in decentralized Bitcoin inheritance to explore, test, and help us shape this tool for the long term.

JXLabs Team

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[2507 Grant] Proposal Update: Funding BΔLT – Bitcoin Autonomous Legacy Trust

Project: BΔLT – Bitcoin Autonomous Legacy Trust
Requested Grant: 30,000 USD (in RBTC)
Builder: JXLabs
Status: Deployed on Rootstock Testnet
Purpose of this post: Update original proposal with a clear grant title and structured milestones.

What is BΔLT?

BΔLT is a decentralized inheritance and custody dApp built on Rootstock. It enables Bitcoiners to secure and pass on their digital legacy using smart contracts - without relying on centralized services or intermediaries. Users can set fallback conditions so that funds or access can be transferred to beneficiaries in case of death or loss of keys.

Milestone Breakdown

To ensure accountability and transparent progress, the requested funds (30,000 USD in RBTC) will be distributed across the following milestones:

Milestone 1: Public Beta Launch on Testnet

  • BΔLT deployed on Rootstock Testnet
  • Launch public Beta Testing phase
  • Collect and implement feedback from testers
  • Publish updated smart contracts and documentation
  • Deliver a short technical summary of fixes and improvements

Requested funds: 8,000 USD in RBTC

Milestone 2: Smart Contract Audit

  • Hire a third-party firm for full audit of the smart contracts
  • Share public audit report
  • Apply security recommendations or remediations
  • Validate contracts for mainnet deployment

Requested funds: 10,000 USD in RBTC

Milestone 3: Mainnet Launch + Awareness Campaign

  • Launch BΔLT on Rootstock mainnet
  • Final integration with wallet/browser
  • Produce educational and promotional content:
    • Medium article
    • Demo video
    • Discord and social media campaign
  • Onboard real users and gather post-launch feedback

Requested funds: 12,000 USD in RBTC

:books: Resources

We’re excited about what BΔLT can bring to the Rootstock and Bitcoin ecosystem, and we’re grateful for the opportunity to build this with your support.

Let’s make Bitcoin unstoppable — even beyond our lifetime.

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A very interesting idea. I’m glad to see you applying it to the rootstock collective. Good luck!

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Thanks @jxlabs for the proposal. We do think this is an interesting project, While we understand the problem this project aims to solve, we still have concerns regarding actual adoption and proof of concept, since this is one of the most critical aspects when it comes to transferring family wealth.

We’d like to raise a few questions:

  1. In the current landscape, are there any competitors building similar solutions? If so, what makes your project stand out from others?
  2. Compared with traditional methods, such as storing private keys in bank vaults or using legal trusts, what are the core reasons why people would choose to use this dApp instead?