Daniel Ortega (xdaniortega / blockbyvlog)
Developer Relations Engineer
I was born in Spain and now live in Andorra.
I'm a creative, technically driven developer with a strong background in Solidity, TypeScript, and C++. I bring a product mindset to blockchain development, communicate clearly with both technical and non-technical teams, and enjoy mentoring and contributing to open source.
I currently work at the Arbitrum Foundation, where I help builders move from an early idea to a product and I turn difficult topics (rollups, smart contracts, agentic tooling, etc.) into systems and explanations that others can use and understand. You will find me doing what I love with love.
Highlighted
Article · 2026A Guide To Agent Wallet Management23K+ views- 23K+ views
A threat-led guide to moving agent keys away from application code, comparing local signers, cloud KMS, and isolated signing services.
Read the article
8:29Video · 2026Building a LangChain AI Agent on Arbitrum14K+ views- 14K+ views
Build an agent with onchain identity, tools generated from a smart contract ABI, and live transaction execution on Arbitrum.
Watch the full videoVoiceSenseLinux rollup × AI voice transactions
- ETHGlobal Paris finalist
- WalletConnect Top 10
AI voice intent becomes a blockchain transaction inside a Cartesi Linux rollup, giving the agent a full Linux execution environment for interpreting and acting on spoken requests.
Explore the project
Writing
An Intro to Agentic CommerceA framework for agentic commerce built around discovery, trust, rules of engagement, and settlement.
- 6K+ views
A framework for thinking about commercial relationships between autonomous agents beyond the payment transaction itself.
Read the articleA Guide To Agent Wallet ManagementA practical guide to agent wallet security, comparing local keys, cloud KMS, and isolated signers.
- 23K+ views
A threat-led guide to moving agent keys away from application code, comparing local signers, cloud KMS, and isolated signing services.
Read the articleAI on Arbitrum: Establishing an Agent Registry with ERC-8004How ERC-8004 gives AI agents portable identity, discovery, and reputation across Arbitrum.
How ERC-8004 gives AI agents portable identity, discovery, and reputation across Arbitrum.
Read the article
Videos
4:32Tutorial · 2026Building Secure Key Management for AI Agents with KMSA small, practical signer architecture that keeps agent keys out of application code.A small, practical signer architecture that keeps agent keys out of application code.
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8:56Tutorial · 2026Secure AI Agent Wallets on Arbitrum with OWSUsing the Open Wallet Standard to give an agent controlled access to an Arbitrum wallet.Using the Open Wallet Standard to give an agent controlled access to an Arbitrum wallet.
Watch the full video- 8:29Tutorial · 2026Building a LangChain AI Agent on ArbitrumConnecting a LangChain agent to Arbitrum and assigning it an ERC-8004 identity.
- 14K+ views
Build an agent with onchain identity, tools generated from a smart contract ABI, and live transaction execution on Arbitrum.
Watch the full video 
10:41Tutorial · 2026How to Register Your AI Agent on ArbitrumA step-by-step ERC-8004 registration tutorial for an agent deployed on Arbitrum.A step-by-step ERC-8004 registration tutorial for an agent deployed on Arbitrum.
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Talks & workshops
Talk · 2026ETHMexico 2026: Why Building Your MVP With AI Is Not EnoughEthereum México: moving from AI-generated prototypes to secure, maintainable products.Ethereum México: moving from AI-generated prototypes to secure, maintainable products.
Talk · 2026MEMEnginy 2026: Beyond Ethereum's Limits: Arbitrum and the Future of ScalabilityMEMEnginy: a technical introduction to rollups, Arbitrum, and scaling Ethereum.MEMEnginy: a technical introduction to rollups, Arbitrum, and scaling Ethereum.
Talk · 2025MERGE Madrid 2025: Blockchain Development Tools: SDKs, Frameworks, and LanguagesMERGE Madrid: choosing practical tooling for modern blockchain development.MERGE Madrid: choosing practical tooling for modern blockchain development.
Talk · 2025MEMEnginy 2025: Blockchain and the Silent Financial RevolutionMEMEnginy: why programmable assets are changing financial infrastructure.MEMEnginy: why programmable assets are changing financial infrastructure.
Talk · 2023W3B Lab Barcelona 2023: Evolving Ethereum Scalability with CartesiCartesi × W3B Lab Barcelona: application-specific rollups and richer computation.Cartesi × W3B Lab Barcelona: application-specific rollups and richer computation.
Work
Arbitrum FoundationDeveloper education and ecosystem support across the Arbitrum platform, AI agents, and the Open House founder program.
- Build technical examples and educational material for developers adopting Arbitrum.
- Research and communicate agent identity, wallet security, ERC-8004, and x402 patterns.
- Support founders and builders through workshops, technical reviews, and Open House.
Nexera FoundationSmart contract architecture for modular token infrastructure and the ERC-7208 standard.
- Designed and implemented modular Solidity systems using Diamond architecture patterns.
- Contributed to ERC-7208 and strengthened its test and audit readiness.
- Led the migration of the contract development workflow from Hardhat to Foundry.
Smart Contract EngineerProtocol engineering and advisory work for TokenOps, Vottun, and other clients across token infrastructure and smart contracts.
- Delivered vesting, staking, token launch, and liquidity infrastructure for multiple Web3 teams.
- Worked across Solidity architecture, testing, deployment, and developer-facing documentation.
CartesiRollup protocol engineering, security research, and developer tooling for application-specific L2 systems.
- Contributed to the Rollups Reference Unit and researched fraud-proof and sequencer designs.
- Improved gas usage and smart contract assurance with fuzzing, static analysis, and symbolic execution.
- Translated protocol research into developer examples and technical presentations.
Banco Santander & USTEnterprise identity and private blockchain integrations for regulated financial services.
- Built identity flows connected to Alastria and Dalion.
- Integrated private services involving the FNMT and Banco de España.
- Worked across smart contracts, APIs, and user-facing applications.
Ilimit, HP & RicohEarlier software engineering experience spanning cloud services, product development, and engineering internships.
Education
BSc in Computer EngineeringUniversitat Autònoma de Barcelona
BSc in Computer Engineering · Universitat Autònoma de Barcelona
Advanced Smart Contract SecurityCyfrin Updraft
Advanced Smart Contract Security · Cyfrin Updraft