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@lewis-dev

Lewis Gilchrist

@lewis-dev·London, UK·Joined April 2026

Sharing my thoughts regarding the emergent technologies related to Digital Security and Digital Privacy.

About

learning about zero-knowledge proofs and decentralized identity, one confusing whitepaper at a time.

Available for

Freelance work, technical writing

Lewis Gilchrist's blogs

My Take on Digital Privacy and Digital Verificationdevabkk.hashnode.dev10 posts

About

learning about zero-knowledge proofs and decentralized identity, one confusing whitepaper at a time.

Available for

Freelance work, technical writing

Lewis Gilchrist's blogs

My Take on Digital Privacy and Digital Verificationdevabkk.hashnode.dev10 posts

Articles Comments1

Recently published

LGLewis Gilchristindevabkk.hashnode.dev·1d ago · 7 min read

The bot problem that CAPTCHA can't solve, and proof of human can

reCAPTCHA and proof of human are both described as ways to keep bots out. They are solving different problems. That sounds like a minor distinction. It is not. The problem reCAPTCHA cannot solve is th

LGLewis Gilchristindevabkk.hashnode.dev·Sep 17 · 8 min read

How proof of human technology works

Everyone's calling it the fix for scams, fraud and fake profiles. I wanted to know how it actually works Lately I keep running into the same phrase: proof of human. It's being talked about everywhere

LGLewis Gilchristindevabkk.hashnode.dev·Aug 24 · 7 min read

The real reason online stores make you verify you're human twice now

Something changed in the last eighteen months that nobody announced. Somewhere between 2023 and now, the friction at online checkout roughly doubled. Add to cart, proceed to payment, and suddenly: cli

LGLewis Gilchristindevabkk.hashnode.dev·Aug 13 · 7 min read

The re-identification problem that breaks "anonymized" data

"Anonymized" is one of the most misleading words in data privacy. It sounds like a guarantee: this data has been stripped of anything that could identify you. In practice, it is closer to a descriptio

LGLewis Gilchristindevabkk.hashnode.dev·Aug 13 · 8 min read

Hashing is not the same as anonymizing, and the difference matters

"We hash your data so it is never stored in plain text." This is a true statement that can mean very different things depending on what the data is, how the hash is constructed and what the attacker h