Bitcoin L2s in 2026: What Do They Actually Do, and Does Anyone Use Them?

Back in 2024, a new “bitcoin L2” launched almost every week, all pitching “redo Ethereum on Bitcoin.” Two years later most are silent, but a handful have survived with real usage. This article sorts survivors along two axes — security model and real use cases — and tries to be honest about which is which. If you have not nailed down BTC itself, the bitcoin overview is a cleaner starting point.

What even counts as a “bitcoin L2”

The definition has drifted constantly. The strict version demands “security equal to Bitcoin.” The loose version just requires “uses Bitcoin somehow.” I split today’s projects into three buckets:

Only the middle bucket delivers anything close to the “security inherited from Bitcoin” promise. The first is an older compromise. The third is basically “another EVM chain with Bitcoin in its name.”

The chain with the most real usage: Stacks

Stacks is the oldest BTC L2, live on mainnet since 2021. Two years ago the impression was “active developers, few users.” That changed in 2026—Ordinals and Runes pushed it into the spotlight.

Today its real use cases are:

• sBTC: BTC locked into Stacks and minted into a usable form that flows through Stacks contracts. Unlike WBTC, sBTC uses a threshold multi-sig rather than a single bridge, which is harder to compromise.
• Ordinals and BRC-20 infrastructure: many of the indexers and marketplaces for BTC-native assets were originally built around Stacks.
• DeFi lending and stablecoins: small in TVL, but real—borrowing sBTC for leverage is cheaper than borrowing on a CEX.

The limits are visible: low TPS, Clarity instead of Solidity, a developer ecosystem one or two orders of magnitude smaller than EVM. But Stacks solves a real wish: “I want to do something with my BTC without leaving the bitcoin security circle.”

The cleanest security model: Botanix and the BitVM family

If Stacks is pragmatic, BitVM is idealist. Even though Bitcoin script is extremely limited, you can still make certain computations challengeable on the BTC chain itself. If an L2 state is wrong, anyone can post the fraud evidence to mainnet, and mainnet punishes the cheater. Clever in design, brutally complex in engineering.

Botanix is the project closest to turning this into a general-purpose EVM L2: BTC is locked into a threshold multi-sig on mainnet, the L2 runs EVM contracts with state roots posted back, and a wrong state root can be challenged via BitVM and slashed. The appeal: EVM developers deploy with almost no code changes, with a much stronger security promise than a sidechain. The cost: finality takes far longer than a traditional rollup, and the BitVM spec is still iterating.

The bucket with the most users: EVM-compatible “Bitcoin-branded” chains

The third bucket is the largest by project count and the easiest one for newcomers to misread.

Merlin, BSquared, CoreDAO and the like share a pattern:

• A bridge brings BTC across, minting mBTC, bBTC and so on.
• The chain itself is an independent EVM with its own validators or sequencer.
• BTC gets used as staking collateral or for incentives, dressing the chain in a Bitcoin narrative.

To be plain: the “security equals bitcoin” claim does not hold here. Their security is roughly the security of their own validator set. But they survived because they solved a concrete need: let BTC holders use familiar MetaMask flows to do DeFi, without touching Ethereum mainnet or yet another alt-L1.

If you want to park some BTC to farm airdrops or harvest yields, this bucket has the best UX. If you want a long-term home for a large stack, the risk is not meaningfully lower than just using Polygon.

What people actually do on these L2s

Real activity I can observe in mid 2026 falls into a few categories:

1. Borrow stablecoins against BTC: RBTC collateral for DOC on Rootstock, or bridged-BTC for USDC on Botanix or Merlin.
2. BTC-denominated liquidity provision: deposit into a DEX pool, earn trading fees plus the platform token. APRs are volatile.
3. Ordinals and Runes derivatives: trade and leverage these around Stacks. Highly cyclical with BTC-native asset prices.
4. New-chain airdrop farming: bridge BTC into a new L2 and grind tasks for the next airdrop. A wave every few months.
5. Institutional compliant DeFi: a few L2s building toward regulated counterparties, still small in TVL.

Simple rule: categories 1, 2 and 3 reflect real demand and tend to persist. Category 4 is pure incentives—the moment they end, the activity vanishes. Category 5 is too early to call.

Where BTC L2 sits in the full “earning yield on bitcoin” picture

A long-term BTC holder in 2026 has more than just L2 as a way to put coins to work. Lining them up side by side makes it obvious when an L2 is even the right tool:

Top to bottom — each row trades higher APR for one more layer of trust given away. L2 sits in the moderate-trust-for-moderate-yield band; long-term core positions belong on the top two rows.

Questions to ask before parking BTC in any L2

Ignore the marketing. Three practical questions are enough:

• The bridge that brought my BTC over—who runs it? Who is in the multi-sig, what is the threshold, is it on-chain verifiable?
• If this chain stops producing blocks for 24 hours, can I recover my BTC using only mainnet data? If not, the setup is custodial in disguise.
• The thing I am doing here—could I do it elsewhere? If it is plain DeFi, this chain is no different from any other EVM L2; you just happen to like the Bitcoin branding.

The landscape is stratifying

My read: there will not be a single winner among bitcoin L2s. More likely two or three stable layers coexist. One serves BTC-native assets and long-term holders (Stacks). Another serves EVM developers playing with BTC-branded assets (Merlin, Botanix). Occasionally a BitVM-grade chain reaches mainnet-class volumes.

If you want to learn hands-on, start with the smallest bridge surface: sBTC on Stacks, RBTC on Rootstock. Use a small position, run “BTC enters, something happens, BTC comes back” end to end. That round trip teaches more than ten research reports. Once you have felt the lifecycle, every future L2 launch becomes legible. To place this in the wider context, the layer 2 overview puts Ethereum rollups and BTC L2s onto the same coordinate, which makes clear why BitVM is the genuinely hard category.