Composable: Exploring Crypto’s Building Blocks (an Espresso Pod)

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Exploring cross-chain composability in a multi-chain world. Composable is a bi-weekly podcast hosted by Alysia and Ellie. Brought to you by Espresso Pods. 

  1. 06.11.2025

    Exploring the Future of MEV w/ Hasu from Flashblocks

    In this episode of Composable, hosts Alysia and Ellie welcome Hasu, an expert in MEV and the strategy lead at Flashbots. They delve into the intricacies of MEV, which stands for Maximal Extractable Value, discussing what it is in detail, its evolution, and its implications for our multi-chain future. The conversation covers topics such as private RPCs, order flow auctions, and the impact of MEV on both user experience and protocol efficiency. The episode also explores the trade-offs between synchronous and asynchronous composability and predicts future trends in crosschain MEV and protocol design. Relevant links from the show. Flashbots writingFlashbots forumArchive of all MEV-related content Composable is a bi-weekly podcast exploring crypto's building blocks. Hosted by Alysia and Ellie, and brought to you by Espresso. Find us on X: Composable — @composablepod Alysia — @alysiatech Ellie — @ellierdavidson

    1 t 5 min

  2. 29.08.2025

    Is Finality Even Real?

    In this episode of Composable, Ellie and Alysia dive deep into one of blockchain's most critical yet confusing concepts: finality. Triggered by a real-world story of someone losing funds due to misunderstanding finality in crosschain transactions, they explore the nuanced definitions of finality, settlement, and confirmations across different blockchain layers. The discussion reveals how finality is not a fixed concept but rather depends on trust assumptions, application requirements, and the observer's perspective. They examine how different stakeholders, from centralized exchanges to DeFi protocols, make trade-offs between speed and security when defining finality for their users. Key topics covered:  Defining blockchain finalityFinality vs settlementLayer 2 finality considerationsCrosschain composability challengesReal-world application examplesDeveloper trade-offs and decisionsConfirmations and block timesVariable finality factorsComposable is a bi-weekly podcast exploring crypto's building blocks. Hosted by Alysia and Ellie, and brought to you by Espresso. Find us on X: Composable — @composablepod Alysia — @alysiatech Ellie — @ellierdavidson

    48 min

  3. 19.06.2025

    Is the FUD even real?

    In this episode, hosts Alysia and Ellie tackle Ethereum FUD (fear, uncertainty, and doubt) head-on by rolling a special "Ethereum FUD" die—a special piece of swag that Espresso Systems produced for ETHDenver 2025—and discussing common criticisms of Ethereum.  They cover everything from fee structures and L2 scaling solutions to fragmentation concerns and Ethereum's overall direction, diving into whether the FUD is valid or simply misconceptions and providing a balanced perspective on the challenges and design decisions facing Ethereum as it evolves. Key topics covered: Fees Too Low - Discussion of the criticism that low Ethereum fees indicate lack of usage and declining demand Parasitic L2s - Debate over whether Layer 2 solutions help or harm Ethereum by potentially siphoning value from L1 Fragmentation - Analysis of liquidity and ecosystem fragmentation across multiple L2 chains No North Star - Examination of claims that Ethereum lacks clear direction compared to competitors like Solana Validator Economics - How fee levels impact validator profitability and network security Product Market Fit - Challenges of finding sustainable use cases for blockchain technology User Experience vs. Decentralization - Trade-offs between ease of use and maintaining decentralized principles Composable is a bi-weekly podcast exploring crypto's building blocks. Hosted by Alysia and Ellie, and brought to you by Espresso. Find us on X: Composable — @composablepod Alysia — @alysiatech Ellie — @ellierdavidson

    1 t 14 min

  4. 23.05.2025

    Are Intents Even Real? Deep Dive into Across Protocol & Prime

    In this episode, Ellie and Alysia dive deep into intent-based bridges, specifically exploring Across Protocol and their proposed Across Prime upgrade. They examine how intent bridges work, their advantages over traditional bridges, and the capital efficiency improvements that Across Prime aims to deliver for solvers (i.e., the liquidity providers that fulfill user intents). Key Topics Covered What are intents and intent bridges - Definition and distinction from traditional bridges, focusing on how users can move assets cross-chain without worrying about underlying mechanismsIntent bridge mechanics - How liquidity bridges work with solvers fronting funds on destination chains rather than actually moving tokens crosschainBenefits for users - Native tokens (no wrapped assets), no slippage concerns, fast transactions, and simplified user experience compared to canonical bridgesIntent lifecycle walkthrough - Three-step process: initiate transaction, fill by solver, and settlement verification using UMA's optimistic oracleSolver risks and challenges - Blockchain reorganization risks, sequencer confirmation dependencies, and capital lock-up issues during settlement periodsAcross Prime proposal - New bonding mechanism that allows solvers to get paid immediately and reuse capital, dramatically improving capital efficiencyCapital efficiency explained - How solvers can potentially earn 50+ transaction fees per hour on the same liquidity instead of just one fee per settlement periodTechnical implementation details - Merkle tree systems for tracking in-flight transactions and user-enforced verification mechanismsSolver rebalancing challenges - Why relayers need better native bridging options to move funds between chains efficientlyERC-7683 standard - Crosschain intent standardization for interoperability between different solver networksNFT bridging limitations - Why liquidity bridges cannot support NFT transfers due to uniqueness constraintsFair exchange problem - Distributed systems challenge of ensuring trustless exchanges and how Across addresses it theoretically and practicallyFuture outlook debate - Whether intents represent the future of crosschain interactions or merely a stopgap until better native interoperability emergesComposable is a bi-weekly podcast exploring crypto's building blocks. Hosted by Alysia and Ellie, and brought to you by Espresso. Find us on X: Composable — @composablepod Alysia — @alysiatech Ellie — @ellierdavidson

    45 min

  5. 01.05.2025

    Are TEEs even real?

    In this episode of Composable, hosts Alysia and Ellie speak with Orest from t1 about proof aggregation, TEEs (Trusted Execution Environments), L2 security, and how these concepts relate to finality. The conversation explores Vitalik Buterin's recent post proposing a "two out of three" proof system combining TEE proofs, ZK proofs, and Optimistic proofs to enhance blockchain security while improving finality times. Orest also shares how t1 is implementing TEEs to achieve faster finality times for L2s while maintaining strong security guarantees. Key Topics Covered: Introduction to TEEs and how they workComparison between TEE proofs and ZK proofsVitalik's proposal for combining multiple proof systemsHow t1 uses TEEs for integrity rather than confidentialityRemote attestation process and its importanceSecurity considerations and risk models for TEEst1's unique approach combining TEE proofs with periodic ZK proofsThe challenges of vendor centralization in TEE ecosystemsReal-world tradeoffs between security, speed, and usabilityComposable is a bi-weekly podcast exploring crypto's building blocks. Hosted by Alysia and Ellie, and brought to you by Espresso. Find us on X: Composable — @composablepod Alysia — @alysiatech Ellie — @ellierdavidson

    57 min

  6. 17.04.2025

    Who Secures Crosschain Messages?

    In this episode of Composable, Alysia and Ellie explore the security of crosschain messages. They examine notable bridge attacks, analyze what makes crosschain messages vulnerable, and discuss various security approaches, including multisigs and Trusted Execution Environments (TEEs). The episode breaks down the technical aspects of securing crosschain messages while considering the trade-offs between speed and usability. Key Topics Covered:Notable bridge attacks like Ronin, Wormhole, and OrbitThe anatomy of crosschain messagesSecurity vulnerabilities in bridge systemsMultisig security models and their limitationsTrusted Execution Environments (TEEs) and their role in securing crosschain messagesTrust assumptions in various other security approachesComposable is a bi-weekly podcast exploring crypto's building blocks. Hosted by Alysia and Ellie, and brought to you by Espresso. Find us on X: Composable — @composablepod Alysia — @alysiatech Ellie — @ellierdavidson

    44 min

  7. 03.04.2025

    Unpacking Intents with Hyperlane's Eda Akturk

    In this episode of Composable, hosts Alysia and Ellie speak with Eda Akturk, a developer advocate at Hyperlane, about intents in general and the recently released Open Intents Framework, specifically. They explore what intents are, how they're changing user experiences in web3, and dive into the collaborative effort behind the Open Intents Framework, which aims to make it easier for developers to build intent-based applications. Key Topics Covered How to define intents in a blockchain context (eg, allowing users to specify their goal rather than know how to reach it themselves)The Open Intents Framework, a collaborative effort led by Hyperlane, Bootnode, and the Ethereum FoundationHow the framework builds upon the ERC-7683 standard proposed by Across and UniswapThe framework's three main components: smart contract base, open-source solver implementation, and ready-to-use UIThe mechanics of intent transactions and how solvers fulfill user requestsHow solvers front liquidity and manage finality risks when bridging between chainsTarget audiences for the Open Intents Framework, especially new chains and crosschain applicationsBenefits of standardization for creating composability between different intent systemsThe competitive solver market and how it leads to better UXThe future vision for intents in the blockchain ecosystemThe unusual level of cooperation between competing L2s and infrastructure projectsComposable is a bi-weekly podcast exploring crypto's building blocks. Hosted by Alysia and Ellie, and brought to you by Espresso. Find us on X: Composable — @composablepod Alysia — @alysiatech Ellie — @ellierdavidson Composable is a bi-weekly podcast exploring crypto's building blocks. Hosted by Alysia and Ellie, and brought to you by Espresso. Find us on X: Composable — @composablepod Alysia — @alysiatech Ellie — @ellierdavidson

    41 min

  8. 23.03.2025

    Are Wrapped Tokens Even Real?

    In this episode, hosts Alysia and Ellie explore the concept of wrapped tokens in the Ethereum ecosystem, discussing their purpose, benefits, and limitations. Key Topics: Canonical vs. wrapped tokensUse cases for wrapped tokensSecurity implications of token issuanceLimitations and challenges of wrapped tokensBridging solutions and speed/security tradeoffsFuture of wrapped tokensComposable is a bi-weekly podcast exploring crypto's building blocks. Hosted by Alysia and Ellie, and brought to you by Espresso. Find us on X: Composable — @composablepod Alysia — @alysiatech Ellie — @ellierdavidson Composable is a bi-weekly podcast exploring crypto's building blocks. Hosted by Alysia and Ellie, and brought to you by Espresso. Find us on X: Composable — @composablepod Alysia — @alysiatech Ellie — @ellierdavidson

    27 min
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Exploring cross-chain composability in a multi-chain world. Composable is a bi-weekly podcast hosted by Alysia and Ellie. Brought to you by Espresso Pods. 

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