jBTCi - The Bitcoin Index Fund

A passive, diversified Bitcoin strategy that automatically rebalances between WBTC and cbBTC while capturing arbitrage opportunities.

Website: https://jbtci.xyz
App: https://mint.jbtci.xyz
Contract: 0x8a4C0254258F0D3dB7Bc5C5A43825Bb4EfC81337
Status: 🚀 LIVE on Base Mainnet — Upgraded Jan 18, 2026

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Overview

jBTCi maintains a 50/50 allocation between WBTC and cbBTC, automatically rebalancing when allocations drift beyond 2%. The strategy captures arbitrage profits during rebalancing, generating 6-10% target APY for depositors.

Key Features

• Passive Strategy - Set it, forget it, earn BTC
• Diversified - 50/50 WBTC/cbBTC allocation
• Secure - Multi-layered circuit breakers, dual oracles
• Efficient - 100% capital efficiency on Base

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Frontend Features

📊 FASB Fair Value Dashboard

• Quarterly and custom date range reporting
• Holdings table with real-time fair value
• Unrealized gain/loss calculations
• CSV export for accountants (FASB ASU 2023-08 compliance)

🏛️ Treasury Mode (Multi-Signature Accountability)

• For church treasuries and organizations
• Safe wallet integration via Safe Apps SDK
• "Two signatures on a check" messaging
• Step-by-step Safe creation guide

Safe Apps Integration ✅

jBTCi is fully compatible with Safe (formerly Gnosis Safe) for multi-signature treasury management.

Features:

• ✅ Auto-connects when opened inside Safe
• ✅ Multi-sig transaction flow
• ✅ No separate wallet connection needed
• ✅ Works with Base mainnet and testnet

Setup:

1. Go to app.safe.global
2. Open your Safe on Base
3. Click Apps → My custom apps → Add
4. Enter: https://mint.jbtci.xyz
5. Click Add (accept the disclaimer)
6. Open jBTCi from Safe - it auto-connects!

Multi-Sig Workflow:

1. One signer initiates deposit/withdrawal
2. Other signers approve in Safe
3. Transaction executes after threshold reached

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Security

• Audit Score: 92/100 ⭐⭐⭐⭐⭐
• See docs/AUDIT_REPORT.md for details

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Contract Addresses

Base Mainnet

Contract	Address
jBTCi Strategy	0x8a4C0254258F0D3dB7Bc5C5A43825Bb4EfC81337
cbBTC	0xcbB7C0000aB88B473b1f5aFd9ef808440eed33Bf
WBTC	0x0555E30da8f98308EdB960aa94C0Db47230d2B9c

Base Sepolia (Testnet)

Contract	Address
jBTCi Strategy	0x43814Da4b3CB4344395A85afF2325282A43cbda6
cbBTC (Mock)	0x0D1feA7B0f63A9DA5b0dA89faFfBb56192d7cd93
WBTC (Mock)	0x5ed96C75f5F04A94308623A8828B819E7Ef60B1c

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Repository Structure

jBTCi-on-Base/
├── contracts/
│   ├── YearnJBTCiStrategy.sol   # Main strategy
│   ├── JubileeTimelock.sol      # 24hr governance
│   └── lib/                     # Yearn V3 base strategy
├── deploy/
│   ├── DeployJBTCi_Mainnet.js   # Production deployment
│   └── DeployJBTCi_Testnet.js   # Testnet with mocks
├── docs/
│   ├── ADMIN_GUIDE.md           # Admin functions
│   └── AUDIT_REPORT.md          # Security audit
├── frontend/                    # Next.js web app
│   ├── app/
│   │   ├── components/
│   │   │   ├── FASBDashboard.tsx    # Fair value reporting
│   │   │   └── TreasuryMode.tsx     # Safe integration
│   │   ├── hooks/
│   │   │   └── useSafeApps.ts       # Safe Apps SDK hook
│   │   ├── providers.tsx        # RainbowKit config
│   │   └── page.tsx             # Main app
│   └── public/
│       └── manifest.json        # Safe Apps manifest
└── README.md

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Quick Start

# Install
npm install

# Compile contracts
npx hardhat compile

# Run frontend locally
cd frontend && npm run dev

# Build for production
cd frontend && npm run build

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Maintenance Mode

During maintenance, mainnet deposits/withdrawals are disabled but testnet (Base Sepolia) remains available for testing. Switch to Base Sepolia in your wallet to test functionality.

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Changelog (Jan 7-17, 2026)

Contract Fixes

• ✅ Jan 17: Fixed critical tokenizedStrategyAddress pointing to testnet instead of mainnet
• ✅ Mainnet redeployment: 0x8a4C0254258F0D3dB7Bc5C5A43825Bb4EfC81337
• ✅ Fixed critical double-counting bug in _calculateTotalHoldings()
• ✅ Fixed same bug in getAllocationDetails()
• ✅ Testnet redeployment: 0x43814Da4b3CB4344395A85afF2325282A43cbda6

Test Suite (100% Pass Rate)

• ✅ scripts/stress_test.js - 11/11 applicable tests
• ✅ scripts/integration_test.js - 8/8 tests
• ✅ scripts/fuzz_test.js - 165/165 random input tests

Frontend Improvements

• ✅ One-time infinite approval (no repeated approval popups)
• ✅ Error handling for cancelled/failed transactions in toast
• ✅ FASB Dashboard now network-aware (mainnet/testnet)
• ✅ Mobile viewport fixes for MetaMask browser
• ✅ Safe Apps SDK manifest updates for multi-sig support

Security

• ✅ Comprehensive audit: 92/100 score
• ✅ Audit report: contracts/AUDIT_REPORT.md

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Built By

Jubilee Labs • Powered by Yearn V3 • Deployed on Base

License

This project is licensed under the MIT License.

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"Seek first the Kingdom of God!" — Matthew 6:33