1/8

People often compare Bitcoin and Ethereum.

Ethereum is easier to build on, with faster iteration, expressive smart contracts, and great tooling.

Bitcoin is slower to evolve, but still the most secure and trusted chain.

@build_on_bob has solved the dilemma to combine them. It’s a Hybrid Layer 2 that brings Ethereum’s flexibility to Bitcoin’s foundation.

It’s not about choosing one chain over the other. It’s about making them work together in a useful way.

2/8

In Phase 2 and 3 of their roadmap, BOB’s Hybrid L2 will inherit Bitcoin security.

3/8

On the research side, BOB is one of the co-authors of the BitVM2 paper and is also working towards a Bitcoin secured rollup.

That means no multisigs, no federations. Just Bitcoin.

With BitVM-style proofs, even one honest node is enough to keep things safe.

BOB’s already working on bridges using BitVM. These let you move BTC without needing multisigs or trusted middlemen.

That’s a big deal. It’s rare to see Bitcoin-based systems aiming for that level of trust minimization.

4/8

BOB also focuses on DeFi usability.

Right now, BOB runs on Ethereum using the OP Stack.

You get fast UX, low fees, and access to over a hundred applications.

What’s interesting is that it’s being built to settle everything back to Bitcoin

In our view, this is a smart way to onboard users while preparing for a deeper Bitcoin integration.

Their 1-click DeFi product lets Bitcoin mainnet users onboard to BOB with BTC and access DeFi strategies which involve Solv, Bedrock, Lombard, Babylon, and Avalon.

5/8

Let’s break down how deposits work.

You can bridge ETH and BTC into BOB.

ETH works like it does on other rollups, but here the final approval comes from Bitcoin.

BTC uses an optimistic-style bridge, with fallback to Bitcoin itself if needed.

This setup already feels more aligned with Bitcoin’s values than most bridges we’ve seen.

6/8

Bitcoin finality is a key part of this architecture.

Because it removes the need to trust multisigs or intermediaries.

If Bitcoin confirms something, users can trust it’s valid.

That’s how BOB aims to unlock native BTC liquidity for DeFi.

This approach also enables hybrid BTC yield products, letting users earn across chains while Bitcoin ensures the trust layer.

From our side, this is one of the most compelling parts of the project.

Makes it easier to use BTC where it actually matters.

7/8

Where things are now.

BOB is live as an Ethereum L2 and already has:

• Over 300 million dollars in assets• More than 500 thousand users• More than 100 deployed applications

Next, they plan to add Bitcoin finality and eventually shift toward a Bitcoin-native rollup using BitVM

We’re watching how this evolves.

8/8

Their goal is to make Bitcoin a true center of DeFi.

Not something you wrap and leave behind, but something you build on directly.

BOB sees hybrid rollups as the way to get there. And maybe they’re right.

If it works, it could reshape how Bitcoin fits into the broader crypto ecosystem.

Let’s take a closer look at how BOB approaches this.

They pioneered the hybrid approach by taking what’s most reliable in Bitcoin and what’s most useful in Ethereum, and build a new kind of Layer 2.

Why is that needed?

Bitcoin is reliable but hard to use in DeFi. Ethereum is great for apps but doesn’t inherit Bitcoin’s trust.

BOB bridges that gap - it works like an Ethereum L2, but eventually settles on Bitcoin.