Ömer Talip Akalın I A Guide to Building Bapps On Citrea I ETHGlobal Taipei 2025

Learn how to build Bitcoin applications (Bapps) on Citrea, the first ZK-rollup for Bitcoin, in this ETHGlobal Taipei 2025 workshop with Ömer Talip Akalın, DevRel at Citrea. Discover why Bitcoin needs scaling solutions, how Citrea's EVM-compatible chain enables smart contracts on Bitcoin, and the risks of traditional cross-chain bridges.

Ömer explains ZK-proof security, Citrea's trust-minimized bridge architecture, and opportunities for developers—from DeFi and stablecoins to NFTs and privacy apps. Whether you're a Solidity developer or new to Bitcoin programmability, this talk covers hackathon bounties, testnet tools, and Citrea's incubation program for builders.

00:00 – Introduction: Why Build on Bitcoin with Citrea?
01:22 – Bitcoin’s Limitations: Programmability & Scalability
03:31 – Bitcoin Script vs. Solidity: Developer Experience
04:37 – High Fees & Slow Transactions: Bitcoin’s Challenges
05:45 – Why Bitcoin Upgrades Are Hard (Philosophical Barriers)
06:18 – Sidechains & Bridges: Current Solutions & Risks
07:28 – How Cross-Chain Bridges Work (And Get Hacked)
09:06 – Citrea’s Solution: ZK-Rollups for Bitcoin
10:19 – ZK-Proofs Explained: Trustless Bitcoin Bridging
12:02 – Citrea’s EVM Compatibility: Code in Solidity
13:10 – Technical Deep Dive: Citrea’s Sequencer & Prover
14:38 – Citrea’s Bridge Architecture (vs. Multisig Risks)
15:46 – Hackathon Tracks: DeFi & Bitcoin Apps (BAPPs)
16:51 – Vision: Hyperbitcoinization & Bitcoin-Backed Economy
17:55 – Citrea Origins: Incubation for Bitcoin Builders
19:34 – Testnet Launch & Mainnet Roadmap (3 Months)
20:07 – Q&A: Bitcoin-Backed Stablecoins & Hackathon Tips

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🇹🇼 ETHGlobal Taipei
This workshop is specifically for at ETHGlobal Taipei, a 3-day hackathon held April 4-6 2025, that brought together the most skilled web3 developers, designers and product builders from all around the globe for a weekend-long adventure to advance the Ethereum ecosystem!

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