Bitcoin Finally Has a DeFi Stack: Most Enterprises Are Still Pretending It Doesn't
Introduction
For most of the cycle, "Bitcoin DeFi" was a phrase that produced eye-rolls in serious institutional rooms. That posture is no longer defensible. As of early 2026, Bitcoin DeFi TVL sits in the £4 to £4.8 billion range. Babylon alone accounts for around £3.7 billion. Liquidium has executed over 75,000 loans against Runes, Ordinals and BRC-20 collateral, totalling more than £290 million in volume and paying over £5 million in BTC interest to lenders. BitVM2 has been demonstrated on Bitcoin mainnet. Wrapped Bitcoin on Ethereum peaked at £12 billion as DeFi collateral. Bitwise's Matt Hougan estimates the BTC staking opportunity at £160 billion over time.
Even with these numbers, less than 1% of Bitcoin's market cap is currently deployed in DeFi, compared to roughly 30% of ETH. The structural opportunity, if you take Hougan seriously, is a 30x growth runway.
The stack that finally exists
Four primitives have matured enough to take seriously:
- Babylon. Native BTC staking, where BTC is locked on Bitcoin L1 and used to provide cryptoeconomic security to PoS chains. £3.7 billion TVL, the largest BTCFi protocol, mainnet live (Babylon Genesis).
- Stacks (sBTC). Smart contracts settling on Bitcoin via Proof of Transfer. The Nakamoto upgrade and sBTC launch in late 2024 made Stacks materially faster and added Bitcoin-secured BTC bridging.
- BitVM2 and ZK bridges. Trust-minimised BTC bridging without requiring a soft fork. BOB, Citrea, Bitlayer, Strata and others are using BitVM2-style designs to let BTC participate in EVM DeFi without relying on a federated multisig (the WBTC pattern).
- Runes and Ordinals. Native UTXO-based fungible-token standard on Bitcoin (Runes, April 2024) and inscription-based digital-asset protocol (Ordinals, 2023). After a slow start, Runes-collateralised lending now drives the majority of Liquidium's volume.
What enterprises should actually take seriously
For an institutional treasurer holding BTC on the balance sheet (a meaningfully larger group than three years ago, courtesy of MicroStrategy/Strategy and the spot ETFs) three concrete questions are now answerable:
- Can BTC earn yield without leaving custody? Increasingly yes. Babylon's native BTC staking model lets BTC contribute to PoS security without leaving the Bitcoin network. Coinbase, OKX, Kraken, Bitfinex, BitMEX, Blockchain.com and Magic Eden have enabled Taproot support, allowing custodied BTC to participate in Runes and Ordinals where mandate allows. (Binance, Crypto.com and Gemini have not, as of early 2026, a real friction for institutions custodying there.)
- Can BTC be deployed as collateral in DeFi without a federated bridge? Increasingly yes. BitVM2-based bridges (BOB, Citrea, Bitlayer) are moving from testnet to mainnet through 2026. The 1-of-n trust assumption (any honest verifier can prove fraud) is materially better than the n-of-m multisig assumption that has driven bridge losses for the last four years.
- What is the institutional product layer? This is the gap. Most BTCFi today is retail-facing. Institutional custodians, prime brokers and structured-product issuers are still early in BTCFi integration. A TwinStake survey cited by Hivemind Capital found 43% of institutions are exploring BTC yield opportunities. We expect the institutional product layer to be the dominant build-out in BTCFi over the next 18 months.
What to ignore
Most BTC-themed L2 tokens. Many of the "Bitcoin L2" tokens launched in 2024 trade at low single-digit fractions of their TGE valuations. Sectoral hype outpaced product. The protocols with real users (Babylon, Stacks, Liquidium, BOB) are the ones to track; the rest can wait.
Most Ordinals NFT collections. The Ordinals collectibles market has matured into a smaller, more mature niche; treating it as a capital-allocation thesis still does not survive contact with the data.
The "Bitcoin will replace Ethereum DeFi" narrative. It will not. Ethereum's expressivity advantage is structural. The right framing is that BTC becomes a productive asset within the broader cross-chain DeFi system, not that BTCFi displaces ETH DeFi.
The contrarian call
Bitcoin's institutional holders (corporate treasuries, ETF allocators, sovereign accumulators) collectively hold a multi-trillion-dollar idle balance. Even a 5% deployment into yield-bearing strategies via Babylon-style native staking and BitVM-secured DeFi represents a £160 billion plus flow. That capital will move once the institutional product layer matures. The window to be early to that infrastructure (custodial integrations, structured product wrappers, prime-brokerage rails) is now.
Conclusion
Bitcoin DeFi is no longer a speculative frontier. It is a maturing yield surface attached to the world's largest crypto asset. Enterprises holding BTC who do not have a position on Babylon, sBTC and BitVM-secured rails by end-2026 are leaving a real yield curve on the table, and signalling to their boards that they are not paying attention.
Holding BTC on a corporate balance sheet? We map BTCFi yield strategies to custody and mandate constraints. Talk to us.