Lombard BTC (BTC.b) is a tokenized, 1:1 backed representation of Bitcoin that operates on the Avalanche C-Chain and other blockchains. Originally launched by Ava Labs as Avalanche Bridged BTC, the asset and its underlying bridge infrastructure were acquired by Lombard Finance in late 2024. Following the acquisition, BTC.b was migrated to a new multi-chain protocol architecture developed by Lombard in partnership with security firm Cubist. The asset is designed to enable Bitcoin holders to utilize their capital within decentralized finance (DeFi) ecosystems for activities such as trading, lending, and providing collateral. ^{[1] [2]}​

Overview

Initially established in 2022 by Ava Labs, BTC.b became the primary bridged Bitcoin asset on the Avalanche network, accumulating a market capitalization of over $500 million. Its purpose was to bridge liquidity from the Bitcoin network into Avalanche's growing DeFi ecosystem. In a strategic move to decentralize network components and focus on core platform development, Ava Labs sold the BTC.b asset and its infrastructure to Lombard Finance, a firm specializing in Bitcoin DeFi and on-chain capital markets. ^{[3] [4]}​

Under Lombard's management, the asset's scope expanded from a single-chain token to a multi-chain asset. The transition involved replacing the original bridge's Intel SGX-based "Warden" network with a new, multi-layered security architecture. This migration was conducted while maintaining the original token contract address, ticker, and on-chain integrations to ensure continuity for existing users and protocols. ^{[5] [6]}​

Lombard positions BTC.b as a foundational, non-yield-bearing asset that provides pure Bitcoin price exposure with high composability. This distinguishes it from Lombard's other product, LBTC, which is an intrinsically yield-bearing Bitcoin asset. The protocol explicitly prohibits the rehypothecation or staking of the native Bitcoin reserves backing BTC.b, ensuring each token remains fully collateralized. The asset's utility comes from its use within other DeFi protocols to generate yield, serve as collateral, or provide liquidity. ^{[2] [5]}​

History and Acquisition

Initial Launch and Growth

Ava Labs launched Avalanche Bridged BTC (BTC.b) in 2022 as part of the original Avalanche Bridge infrastructure. It quickly became a cornerstone asset within the Avalanche DeFi ecosystem, widely integrated into major protocols like Aave, BENQI, and Trader Joe for lending and liquidity purposes. By late 2024, its circulating supply had grown to approximately $550 million. ^{[7] [4]}​

Acquisition by Lombard Finance

In late 2024, Lombard Finance announced its acquisition of the BTC.b asset, its brand, and the associated bridge infrastructure from Ava Labs. The deal was described as a first-of-its-kind acquisition of a live on-chain asset's infrastructure. ^{[3] [8]}​

​John Wu, then-president of Ava Labs, stated the transition would allow Ava Labs to focus on its core competencies while enabling Lombard to drive product velocity and expand BTC.b to new chains. For Lombard, the acquisition was a strategic move to integrate a major bridged asset into its product suite, with the goal of developing on-chain capital markets for Bitcoin. To ensure a seamless transition for the ecosystem, Lombard committed to maintaining BTC.b as a "neutral public good," preserving its contract address, name, ticker, and existing DeFi integrations on Avalanche. ^{[3] [4]}​

Technical Transition

Following the acquisition, a technical migration period began, which was completed by Q4 2025. This process involved transitioning all bridge operations from Ava Labs' architecture to the new Lombard Protocol. The final deadline for users to redeem BTC.b from the old bridge was January 28, 2026, after which all operations were exclusively handled by Lombard's infrastructure. During the cutover, minting and redemption functions experienced a brief downtime of up to two hours. ^{[5] [3]}​

Technical Architecture

The Lombard Protocol introduced a multi-layered, trust-minimized architecture to replace the previous system. This new infrastructure was co-developed with the security firm Cubist and is designed for enhanced security and multi-chain scalability. ^[8]​

Security Model

The architecture is composed of four main layers:

• Layer 1: Decentralized Validation (Security Consortium): At the core is a 15-member Security Consortium of independent digital asset institutions operating a Byzantine Fault-Tolerant (BFT) consensus layer known as the "Lombard Ledger." Every protocol operation, such as a mint or burn, must be recorded on this ledger and receive majority consensus from the consortium to be executed. Announced members include OKX, Galaxy, Digital Currency Group (DCG), Wintermute, Figment, Kiln, Antpool, F2Pool, and Kraken. ^[8]

• Layer 2: HSM-Backed Key Management: The protocol uses Cubist's CubeSigner platform for non-custodial key management. The cryptographic keys are managed within a combination of FIPS 140-compliant Hardware Security Modules (HSMs) and Nitro Enclaves. This allows consortium members to cryptographically approve transactions without ever having direct access to the underlying secret key material, distributing trust and eliminating single points of failure. ^{[8] [3]}

• Layer 3: Governance & Security Policies: The system enforces strict, configurable policies on key usage. These include mandatory timelocks for sensitive operations, multi-party approval (MPA) requirements for all transactions and policy changes, and programmatic restrictions that limit keys to signing only specific, pre-approved transaction types. ^[8]

• Layer 4: Independent Bridge Verification: A dual-verification model provides constant, independent checks to ensure the 1:1 backing of BTC.b.

  1. Cubist's Bascule Drawbridge: An automated system that continuously verifies collateral consistency between the native Bitcoin custody address and the total supply of BTC.b across all connected chains. It can halt bridge operations if a discrepancy is detected. ^[8]
  2. Chainlink Proof of Reserve (PoR): Provides real-time, on-chain audits that transparently verify the amount of Bitcoin held in the reserves against the circulating supply of BTC.b. ^[6]

Minting and Redemption

The Lombard Protocol enables a permissionless process for creating and redeeming BTC.b. ^[6]​

• Minting: A user deposits native BTC to a unique deposit address generated by the Lombard portal. After three confirmations on the Bitcoin network, an equivalent amount of BTC.b is minted to the user's specified EVM-compatible wallet. The minting fee is zero.
• Redemption: A user initiates a redemption by burning their BTC.b tokens through the portal and providing a native Bitcoin address. The request is processed and signed by the Security Consortium, releasing the native BTC to the user's address. There is a fixed redemption fee of 0.0001 BTC.

For developers, the transition deprecated the old unwrap function on the token contract. Redemptions are now handled via the redeemForBTC() function on a new AssetRouter smart contract. ^[5]​

Product Strategy and Utility

Institutional and Multi-Chain Focus

Lombard's strategy for BTC.b is centered on two main goals: activating idle Bitcoin liquidity and establishing BTC.b as a standard multi-chain bridged asset. The firm targets the estimated 2 trillion in Bitcoin held by institutional investors, asset managers, and corporate treasuries. It offers a "receipt token" model where institutions can collateralize their Bitcoin for on-chain use while the underlying asset remains in their chosen qualified custody. ^[9]​

A key part of the strategy is multi-chain expansion. After consolidating its position on Avalanche, Lombard initiated the deployment of BTC.b on other blockchains. A major cross-chain expansion event occurred on January 28, 2026. The initial expansion phase targeted Ethereum, Solana, Katana (Ronin's zkEVM network), and MegaETH, where BTC.b was slated to be the canonical bridged Bitcoin asset. ^{[8] [10]}​

Developer and Ecosystem Integration

To foster adoption, Lombard provides a Software Development Kit (SDK) that allows third-party protocols and applications to natively integrate BTC.b minting and redemption. This removes integration barriers and allows dApps to offer seamless access to Bitcoin liquidity. Adopters of the Lombard SDK include Binance, Bybit, MegaETH, and Silo Finance. ^[6]​

Market and On-Chain Data

As of March 2026, Lombard BTC had a market capitalization of approximately 125,862, recorded on October 6, 2025. ^{[1] [11]}​

• Contract Address (Avalanche C-Chain): 0x152b9d0FdC40C096757F570A51E494bd4b943E50 ^[1]
• Primary Trading Venues: BTC.b is primarily traded on decentralized exchanges within the Avalanche ecosystem, with Pharaoh Exchange being one of the most popular venues for the BTC.B/WAVAX pair. It is also available on centralized exchanges like MEXC. ^{[1] [7]}
• On-Chain Analytics: Lombard maintains a public dashboard on Dune Analytics that provides real-time data on the protocol's Total Value Locked (TVL), transaction volumes, holder distribution, and other key metrics. ^[12]

Key Entities and Partnerships

• Lombard Finance: The current owner, operator, and developer of the BTC.b asset and bridge. The firm focuses on building institutional-grade infrastructure for bringing Bitcoin into on-chain capital markets.
• Ava Labs: The founding developer of the Avalanche network and the original creator of BTC.b, who transferred the asset's operations to Lombard. ^[2]
• Cubist: The core technology partner providing the non-custodial key management platform (CubeSigner) and the independent verification system (Bascule Drawbridge) that underpins the Lombard Protocol's security. ^[8]
• Chainlink: A key technology partner providing the Cross-Chain Interoperability Protocol (CCIP) for secure messaging and the Proof of Reserve (PoR) feeds for transparent collateral verification. ^[6]
• Security Consortium: The group of 15 institutional validators who secure the network, including prominent firms like OKX, Galaxy, DCG, and Kraken. ^[8]

Quotes

"As the first step in a broader strategic partnership with Lombard, this transition will allow Ava Labs to focus more on its core competencies and Lombard to drive product velocity and expand BTC.b to new chains." — John Wu, former President of Ava Labs ^[3]

"The transition of BTC.b to Lombard is an exciting evolution for one of the premiere assets in the Avalanche ecosystem... Lombard’s architecture and consortium of top-tier members can provide the resources and focus to grow BTC.b across many blockchains..." — Emin Gün Sirer, CEO of Ava Labs ^[5]

"We believe there should be a single, dominant, non-custodial BTC standard for the decentralized economy, and we are committed to making BTC.b this standard." — Statement from Lombard Finance ^[2]

"By replacing the secure-enclave-based bridge with a non-custodial design, Lombard is demonstrating its deep commitment to transparency and decentralization." — Rija, Co-founder and CEO of Cubist ^[7]