The problem bitRWA (cross-chain)Bridge solves

bitRWA-bridge
A trust-minimized, compliant, and capital-efficient way to bring RWAs—like tokenized T-Bills (e.g., BlackRock’s $BUIDL)—to Bitcoin via Rootstock, enabled by Chainlink infrastructure, BitMask Wallet, and Ondo’s RWA stack. This unlocks native BTC yield and Bitcoin-based DeFi for institutional and retail market participants.

$ Multi - compliant RWAs USDY, OUSG
⛓️ Multi- chain deployment Ethereum, Avalanche, Rootstock (BTC)

Inspiration
As the founder of BitMask, I recently spoke with the RWA team at Franklin Templeton (who currently manage ~$741.5 million in tokenized assets ). We explored a simple but powerful question:

What if RWAs could be deployed, bridged and traded directly to Bitcoin?

The gleam in their eyes said it all—and sparked a deeper dive into institutional appetite for this future. That exploration led us to this hackathon, where we’ve built *an institutional grade cross-chain bridge for RWAs, specifically US-Treasuries. *

• ChainlinkCCIP, Functions, Chainlink Proof of Reserves, and Data Feeds

• Ondo’sRWAHub contracts and Securitize’s KYC/AML stack

• BitMaskWallet for seamless RWA access on Rootstock, Bitcoin’s smart contract layer

• RWAs deployed on Avalanche Fuji supporting the cross-chain bridge to Bitcoin

The Opportunity - Real-World Assets Meet Bitcoin
Global asset managers, corporate treasuries, and sovereign wealth funds already hold or want Bitcoin exposure. Tokenizing RWAs like U.S. Treasuries, real estate, and commodities on Bitcoin unlocks:

• Global Access – Anyone, anywhere, anytime
• Instant Settlement – Finality on Bitcoin’s secure rails
• Programmable Finance – RWAs meet DeFi on BTC via Rootstock
• BTC Yield Opportunities – Institutions earn yield, natively swapped to BTC
• Bitcoin-Secured – Protected by over 80% of Bitcoin’s PoW hashpower via merge-mining
• Lower & Predictable Fees – Rootstock gas costs are stable and significantly cheaper than Ethereum
  This creates a zero-friction capital loop and unlocks trillions in institutional capital, with composability and compliance at its core.

Potential Market Impact and Revenue
If the tokenized RWA market reaches $1 trillion (a mid-range projection), Bitcoin via BitRWA bridge capturing even 2–5% would represent $20–50B in assets.

At a 3% yield:
➤ $20B = $600M/year in yield on Bitcoin rails

With swap/bridge fees (~0.05–0.1%):
➤ $10–25M/year in protocol revenue

About BitMask
💎 → BitMask is a unique Bitcoin wallet and infrastructure that facilitates tokenization via smart contracts on Bitcoin. We support both RGB (Bitcoin native) and Rootstock (EVM compatible) smart contracts natively on Bitcoin. $2.5million and backed by Tim Draper of Draper Associates, in addition to prolific investors.
Development grant from Rootstock FoundationRootstock is Bitcoin’s EVM-compatible smart contract layer, secured by merge-mining. It enables DeFi and tokenized RWAs with Bitcoin-grade security.

Architecture Overview

The bridge consists of three main components:

1) BitRWABridge (Ethereum/Sepolia)

Role:

• Accept user deposits of USDY
• Lock tokens in escrow
• Validate compliance and wallet binding
• Construct and dispatch CCIP message

Relevant Address:

• Sepolia CCIP Router: 0xD0daae2231E9CB96b94C8512223533293C3693Bf

2) BitRWABridgeAdapter (Rootstock)

Role:

• Receive CCIP messages
• Validate and parse payloads
• Query RBTC/rUSDY price feed
• Mint rUSDY tokens proportional to locked USDY value

Relevant Address:

• Rootstock CCIP Router: 0x536d7e53d0adeb1f20e7c81fea45d02ec8dde1b8

3) Token Contracts

• USDY (Ethereum): ERC-20 token representing RWA from ONDO contract on the user account
• rUSDY (Rootstock): RRC-20 mintable token pegged to USDY value on ONDO RWAhub contract

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Using BitRWA to bridge $USDY onchain

Phase 1 – Compliance and Wallet Binding

Purpose: Verify the user is eligible and bind their wallet cross-chain.

• Access Control: onlyOwner and onlyCompliant

Phase 2 – Token Locking and Message Dispatch

1. Verify compliance and balance
2. Lock tokens on Ethereum
3. Snapshot ETH/USDY price
4. Dispatch CCIP message

Phase 3 – Cross-Chain Message Relay

Infrastructure:

• Chainlink CCIP relays message across networks.
• Chain selectors:
  • Sepolia: 16015286601757825753
  • Rootstock: 12532609583862916517

Phase 4 – Minting on Rootstock

1. Validate sender authenticity
2. Calculate rUSDY equivalent with live price feeds
3. Mint tokens to bound wallet

Phase 5 – Confirmation and Balance Update

• Send confirmation message
• Reduce locked balances on Ethereum
• Emit BridgeCompleted

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Price Feed Integration

Chainlink feeds used:

• ETH/USDY: 0x694AA1769357215DE4FAC081bf1f309aDC325306
• RBTC/rUSDY: 0x1b44F3514812d835EB1BDB0acB33d3fA3351e43

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avax address: 0xD071876B13886e01988CEa66C87b93B3073233

Challenges we ran into

Building the first permissionless, compliant bridge for RWAs was challenging but rewarding. We faced:

Complex ONDO RWAhub contracts – understanding claim logic and compliance flows

Testnet deployment issues – adapting ONDO contracts for test environments and setting up mock USDY supply

CCIP integration errors – handling message encoding bugs, gas limit reverts, and sender authorization failures

Despite these hurdles, we successfully delivered a working cross-chain, price-aware bridge.

Once everything was working on ETH, we had no issues whatsoever deploying on avalanche and completing an Avalanche - Rootstock (btc) bridge using CCIP