Bitcoin Restaking Explained: How Babylon and Lombard Dominate BTCFi

Over $5 billion in Bitcoin now sits in restaking protocols, earning yield by securing external networks. That number was effectively zero in early 2024. The growth has been driven almost entirely by two projects: Babylon, which pioneered native BTC staking without bridging, and Lombard, which wraps that staked position into a liquid token deployable across 20+ chains. Together, they account for the majority of total value locked in the Bitcoin restaking market.

This article explains how Bitcoin restaking works at a technical level, where the yield comes from, what the risks are, and how it compares to Ethereum's restaking model through EigenLayer.

What Is Bitcoin Restaking?

Bitcoin does not have a native proof-of-stake consensus mechanism. Unlike Ethereum, there is no protocol-level staking reward for locking BTC. But Bitcoin's economic security (over $2 trillion in market cap) is vastly underutilized: only about 0.3% of circulating BTC participates in any form of staking or DeFi.

Bitcoin restaking protocols solve this by letting BTC holders lock their coins to secure external proof-of-stake networks. The locked BTC serves as economic collateral: if a validator misbehaves, their delegated stake can be slashed. In return, stakers earn yield from the networks they help secure. The key innovation is doing this without requiring BTC to leave the Bitcoin blockchain.

Restaking vs. staking: In the Ethereum ecosystem, "restaking" specifically means taking already-staked ETH and reusing it to secure additional services. In Bitcoin's context, the term is used more loosely since BTC has no native staking. Babylon calls its approach "Bitcoin staking," while the broader market often labels the entire category "restaking" by analogy with EigenLayer.

How Babylon Works: Native BTC Staking via Bitcoin Script

Babylon is the foundational protocol in Bitcoin restaking. Launched in phases starting August 2024, it enables BTC holders to stake directly on Bitcoin's L1 using Bitcoin Script without bridging, wrapping, or transferring BTC to another chain. The staked coins never leave a UTXO that the staker controls.

The Staking Transaction

When a user stakes BTC through Babylon, they create a special Bitcoin transaction that locks their coins in a UTXO with three distinct spending paths encoded in Bitcoin Script:

• Timelock path: the BTC is locked for a predefined number of Bitcoin blocks (up to approximately 64,000 blocks, or roughly 15 months). After expiry, the staker can freely reclaim their coins.
• Unbonding path: the staker can unlock early with a minimum unbonding period of 1,008 blocks (about 7 days), requiring the staker's signature plus approval from a Covenant Committee.
• Slashing path: if a Finality Provider (Babylon's term for a validator) double-signs, a pre-authorized slashing transaction can execute against the staker's locked BTC.

Because Bitcoin Script is not Turing-complete, Babylon uses a Covenant Committee: an M-of-N multisig group that emulates covenant functionality to enforce unbonding and slashing rules on-chain.

EOTS: Extractable One-Time Signatures

Babylon's slashing mechanism relies on a cryptographic primitive called Extractable One-Time Signatures (EOTS), built on Schnorr signatures enabled by Taproot. The mechanism works as follows:

1. Each Finality Provider generates a unique EOTS public/private randomness pair for every block height they plan to validate.
2. The public randomness is committed to the Babylon Genesis chain in advance.
3. For each block, the provider signs using their EOTS key with that block's committed randomness.
4. If a provider signs two different blocks at the same height (double-signs), the two signatures mathematically expose their private key.

Once the private key is exposed, anyone can use it to execute the pre-authorized slashing transaction on Bitcoin. The Finality Provider is permanently banned ("tombstoned"), their voting power drops to zero, and all delegated BTC stakes become subject to slashing. This model is elegant because it requires no smart contracts: the slashing condition is purely cryptographic and enforceable on Bitcoin L1.

Finality Providers and Bitcoin Secured Networks

Finality Providers are professional node operators who validate transactions on what Babylon calls Bitcoin Secured Networks (BSNs): external proof-of-stake chains that use staked BTC as their economic security. Over 250 Finality Providers currently operate on the network, including institutional operators like Figment, Galaxy Digital, and Allnodes.

The Babylon Genesis chain launched on April 10, 2025 as the first BSN: a Cosmos SDK-based L1 secured by staked Bitcoin. It introduced the BABY governance token (10 billion initial supply, 8% annual inflation split between BTC stakers and BABY stakers). A multi-staking feature, currently in testnet, will allow a single BTC stake to simultaneously secure multiple BSNs and earn reward streams from each.

Babylon's Growth: From 1,000 BTC to 56,000+ BTC

Babylon rolled out in three staking caps during Phase 1, each growing dramatically:

As of mid-2026, Babylon holds approximately $4 to $5.6 billion in staked BTC (fluctuating with Bitcoin's price and staking flows). In April 2025, roughly 14,929 BTC ($1.26 billion at the time) was temporarily unstaked during the Genesis migration as Lombard and other delegators transitioned to new Finality Providers, causing a 32% TVL drop that subsequently recovered.

Lombard and LBTC: Making Staked BTC Liquid

Babylon solves the staking problem, but it creates a new one: locked BTC cannot be used elsewhere. Lombard addresses this through LBTC, a liquid staking token backed 1:1 by BTC staked via Babylon. When you deposit BTC into Lombard, the protocol stakes it through Babylon and mints LBTC on your chosen destination chain.

How LBTC Minting Works

1. A user deposits BTC to a Lombard-designated Bitcoin address.
2. After six Bitcoin block confirmations, Lombard's Security Consortium verifies the deposit.
3. The Consortium (14 institutional members including OKX, Galaxy, Wintermute, and Figment) provides a 2/3 multisig approval via FIPS 140-compliant hardware security modules.
4. LBTC is minted on the user's chosen chain.
5. The underlying BTC is staked through Babylon, accruing yield.

LBTC is currently available on over 20 chains including Ethereum, Base, Arbitrum, BNB Chain, Solana, Sui, and Berachain. In May 2026, Lombard migrated its cross-chain infrastructure from LayerZero to Chainlink CCIP, moving over $1 billion in assets to the new bridge after security concerns in the broader ecosystem. Over 80% of minted LBTC is actively deployed in DeFi protocols like Aave and Morpho, integrated with 70+ protocols in total.

Lombard reached $1 billion in TVL within 92 days of launch, making it one of the fastest-growing protocols in DeFi history. It currently holds roughly $900 million to $1 billion in LBTC market cap, representing approximately 60% of the Bitcoin liquid staking market.

Trust assumption: LBTC introduces a trust layer that native Babylon staking does not have. Users trust the 14-member Security Consortium to correctly verify deposits and mint/burn LBTC. While the 2/3 multisig and HSM-backed key management mitigate single points of failure, this is not a trustless system. If 10 of 14 Consortium members collude or are compromised, staked BTC could theoretically be misdirected.

Where Does the Yield Come From?

Restaking yield is not printed from thin air. It comes from the networks that consume Bitcoin's economic security:

• BSN fees: proof-of-stake chains pay to use staked BTC as their validator collateral, typically distributing a share of their native token inflation or transaction fees to BTC stakers.
• BABY token rewards: Babylon Genesis allocates a portion of its 8% annual token inflation to BTC stakers securing the network.
• DeFi yield (for LBTC holders): beyond base staking rewards, LBTC can be deposited into lending protocols, liquidity pools, and yield aggregators, compounding returns.

Current base staking yields hover around 1% to 3% APY denominated in BTC, with additional token incentives varying by BSN. This is modest compared to Ethereum staking's 3% to 4% base rate, but for BTC holders who previously had no native yield option, it represents a meaningful shift.

Bitcoin Restaking vs. Ethereum Restaking

Babylon is often called "EigenLayer for Bitcoin," but the two protocols differ fundamentally in architecture. EigenLayer operates entirely within Ethereum's smart contract environment, while Babylon must work within Bitcoin Script's constraints.

EigenLayer's advantage is programmability: each AVS can define custom slashing conditions and validation logic. Babylon's advantage is simplicity: binary slashing via EOTS is easier to reason about and audit. Both share the "no-bridging" property, letting the base asset remain on its native chain.

One notable divergence: EigenLayer (now rebranded to EigenCloud) has struggled with token economics, with its EIGEN token down approximately 96% from its all-time high and the protocol running a reported $12.7 million annual deficit (incentive payouts exceeding fee revenue). Babylon is earlier in its lifecycle and has not yet faced the same economic pressure, but the pattern suggests that sustainable unit economics in restaking remain unproven.

The Broader BTCFi Landscape

Babylon and Lombard are the largest players, but the BTCFi ecosystem includes several other protocols competing for staked BTC:

• Solv Protocol (SolvBTC): approximately $2.15 billion TVL with 19,456 BTC in reserves across 11 chains, offering yield strategies through a basket approach rather than pure restaking.
• Bedrock (uniBTC): a multi-asset liquid restaking protocol with roughly $1.2 billion TVL, though it suffered a $2 million security exploit in 2024.
• pSTAKE Finance (yBTC): non-custodial Bitcoin liquid staking built on Babylon, backed by Coinbase Ventures and Binance Labs, though significantly smaller in TVL.

The total BTCFi TVL grew from approximately $304 million in January 2024 to over $7 billion by December 2024: a 22x expansion in a single year. Babylon alone accounts for the majority of this growth. Still, only about 0.3% of all circulating BTC participates in staking derivatives, compared to roughly 28% of ETH that is staked. The headroom for Bitcoin restaking growth is enormous if trust and risk concerns can be addressed.

Risks and Criticism

Bitcoin restaking has vocal critics who argue it introduces systemic risk to the broader crypto ecosystem. The concerns fall into several categories.

Cascading Slashing Risk

When the same BTC collateral secures multiple networks simultaneously (Babylon's planned multi-staking feature), a slashing event on one BSN could cascade. If a Finality Provider is slashed on Network A, the reduced collateral backing Network B may trigger further instability. JPMorgan warned in 2024 that restaking could produce "a cascade of liquidations" if staked assets are slashed, hacked, or drop sharply in value.

Consensus Overload

Vitalik Buterin's 2023 essay "Don't Overload Ethereum's Consensus" articulated the core philosophical concern: using a chain's economic security to validate external protocols creates "too-big-to-fail" dynamics. If a restaking protocol grows large enough, its failure could pressure the base layer's community to intervene with a bailout fork. While Buterin wrote about Ethereum specifically, the argument applies equally to Bitcoin.

Rehypothecation and Leverage

Liquid staking tokens like LBTC enable rehypothecation: the same underlying BTC simultaneously backs a staking position, serves as collateral in a lending protocol, and provides liquidity in a DEX pool. Each layer adds yield but also adds risk. A depeg of LBTC from its BTC backing could trigger liquidation cascades across every protocol where it is used as collateral.

Unproven Slashing in Production

As of mid-2026, no major slashing event has occurred on either Babylon or EigenLayer's mainnet. This means the slashing mechanism is untested under adversarial conditions. Academic research suggests that even modest slashing events (0.1% of stake) could compound to 1.1% total loss through cascading effects across interconnected services. Anti-slashing tools exist (Cubist's CubeSigner for Babylon), but the system has not been stress-tested.

The bull case for Babylon's slashing model: EOTS-based slashing is simpler and more predictable than EigenLayer's customizable smart contract slashing. A Finality Provider either double-signed or did not: there is no ambiguity, no governance vote, and no subjective dispute. This binary simplicity may prove to be a feature rather than a limitation when slashing events eventually occur.

Bitcoin Restaking vs. Bitcoin Payments

Bitcoin restaking and Bitcoin payment protocols represent two distinct pillars of BTC utility expansion. Restaking unlocks yield on idle BTC, turning Bitcoin into productive collateral that secures external networks. Payment protocols like Spark unlock spending, enabling instant, low-cost BTC and stablecoin transfers for everyday transactions.

These are complementary rather than competing use cases. A Bitcoin holder might stake a portion of their BTC through Babylon for long-term yield while keeping another portion on Spark for daily payments and self-custodial stablecoin transfers. The two categories also differ in their trust models: restaking requires trusting Finality Providers and potentially liquid staking intermediaries, while Spark's statechain model requires only 1-of-n operator honesty during the moment of transfer, with the ability to unilaterally exit to Bitcoin L1 at any time.

Together, restaking and payments address Bitcoin's two most persistent criticisms: that it generates no yield and that it is too slow for daily commerce. As both categories mature, they expand Bitcoin's addressable use cases well beyond store of value.

What to Watch

Several developments will shape Bitcoin restaking over the next 12 months:

• Multi-staking launch: Babylon's mainnet multi-staking will allow a single BTC deposit to secure multiple BSNs simultaneously. The economics of this feature (compounding yields vs. compounding risk) will define the next phase of growth.
• BSN adoption: the value proposition depends on real chains choosing Bitcoin-backed security over alternative models. Osmosis, BOB, and Sui have committed, but the pipeline needs to grow.
• Slashing in practice: the first real slashing event on either Babylon or EigenLayer will test whether the theoretical models hold under adversarial conditions.
• LBTC cross-chain security: Lombard's migration to Chainlink CCIP is a bet on bridge reliability. Any exploit of cross-chain infrastructure could undermine confidence in liquid staked BTC broadly.
• Regulatory clarity: as stablecoin legislation and broader crypto regulation take shape, the classification of staking yields (as securities, income, or something else) will affect institutional adoption.

For a broader view of how restaking fits into Bitcoin's scaling landscape, see our Bitcoin Layer 2 comparison and the BTCFi landscape overview. Developers interested in building on Bitcoin's Layer 2 ecosystem can explore the Spark SDK documentation for payment-focused integrations, or the Babylon developer docs for restaking integrations.

This article is for educational purposes only. It does not constitute financial or investment advice. Bitcoin and Layer 2 protocols involve technical and financial risk. Always do your own research and understand the tradeoffs before using any protocol.