humuhimi

Humuhimi

Redefining the future of identity through technology while traveling the world in a campervan

Profile

about me

Nice to meet you! I'm Humuhimi, also known as Masayoshi Arakawa.

I'm an engineer traveling in a campervan.

Full-stack Engineer Specializing in Digital Identity

I'm passionate about digital identity and security for everything from humans to AI agents.


Expertise

  • Decentralized Identity (DID/Verifiable Credentials)
  • Full-stack Development (TypeScript, Rust)

Current Interests

  • Self-Sovereign Identity
  • AI Agent Identity & Authentication
  • Zero-Knowledge Proofs

Things I Love

  • Travel and discovering new places
  • Programming (I love building things)
  • Reading and walking
  • International exchange

Feel free to reach out for work or collaboration!

face icon

Humuhimi

Experience

Experience
PeriodDescriptionResponsibilitiesLanguages/Tools
2022/07~

DID/VC & Blockchain Development

  • Design & development of decentralized identity infrastructure
  • Implementation of Verifiable Credentials
  • TypeScript
  • Rust
  • Ethereum
2022/04~2022/07

Data Analytics Platform

  • E-commerce data analytics platform
  • Feature implementation
  • python
  • cloud function
  • pub/sub
  • cloud build
  • big query
  • cloud storage
2020/11~2022/03

CMS Development

  • CMS development using PHP
  • Implementation
  • PHP
  • cakePHP2
  • cakePHP4
  • Javascript
  • Jquery
  • Vue.js
For further details

Please contact me directly.

  • I can provide a detailed CV.
  • 📝

Certificates

Date AcquiredCertificate Name
January 2018HSK Level 5, 243 points
January 2018TOEIC, 725 points
May 2019LPIC 101
May 2019LPIC 102
June 2019Oracle Bronze SQL

Portfolio

Portfolio

Code & Projects

Open source projects & development work

GitHub Profile

DID/VC, blockchain, and full-stack development projects

TypeScriptRustSolidity

Research & Publications

Papers & technical reports

Post-Quantum Cryptography for Verifiable Credentials

Comprehensive Performance Evaluation Including Selective Disclosure

PQCDIDVerifiable CredentialsML-DSA

Media & Talks

Technical explanations & presentations

Preparing for the Quantum Era - PQC in Verifiable Credentials

Technical talk on post-quantum cryptography for VCs

PQCVerifiable CredentialsML-DSA

Hedera AI Agent Marketplace

Hedera Hackathon AI Theme Demo

HederaAI AgentHackathon

Solving Max Cut Problem with Quantum Computer

Practical tutorial video on quantum algorithms

Quantum ComputingQAOAMax Cut

Blog

Medium

Sharing technical articles and daily learnings

Writing about DID/Verifiable Credentials, blockchain technology, and web development. Documenting my journey as a digital nomad engineer traveling in a campervan.

DID/VCBlockchainTypeScriptRustTravel
Visit Blog

Contact

  • GitHub
  • LinkedIn
  • X
  • Bluesky
  • Facebook
  • Instagram
  • WeChat

Others

Others

Under consideration...

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