Part 1 of “Oracles in Practice” — a hands-on series for smart-contract engineers. Every contract in this series was compiled against OpenZeppelin 5.x and exercised on a real EVM. You already know the one-liner: smart contracts can’t call the outside world. This series is about what that actually forces you to do, where the bodies…
Part 4 of “The Oracle Problem” — a plain-language series on the hardest question in Web3. We’ve reached the end of the road, and it’s time for the honest part. Over three articles we’ve watched clever people spread trust across expert panels, time-averages, and quorums of witnesses (Part 3), all to shrink the oracle problem…
Part 3 of “The Oracle Problem” — a plain-language series on the hardest question in Web3. So far the news has been discouraging. A blockchain can’t see the outside world (Part 1), and AI can’t magically fix that (Part 2). Yet somehow, billions of dollars flow through systems that depend on outside data every day,…
Part 2 of “The Oracle Problem” — a plain-language series on the hardest question in Web3. In Part 1 we met the blockchain’s strange handicap: it’s a flawless machine sealed off from the outside world, forced to rely on messengers — oracles — to learn anything about reality. And those messengers can lie. By now…
Part 1 of “The Oracle Problem” — a plain-language series on the hardest question in Web3. Imagine a brilliant accountant locked inside a sealed, windowless room. Slide a question under the door and she’ll answer it flawlessly — as long as the answer can be worked out from the papers already inside the room. But…
The one rule that separates a responsible blockchain developer from a careless one. We’ve reached the end of the road, and it splits in two directions. In Part 1, we saw that data on a public blockchain can’t be deleted. In Part 2, we found ways to reduce the harm after something bad is posted….
The comforting half of the story: even permanent data has weak points. In Part 1, we landed on a scary conclusion: some data written to a public blockchain can never be deleted. Not by a court, not by the victim, not by anyone. If that’s where the story ended, blockchain would be a doomsday machine…
Why some data, once written to a blockchain, can never be erased — explained without the jargon. Think about a tattoo. You can regret it. You can cover it with a long sleeve. You can pay a lot of money to fade it. But the ink is in your skin. It doesn’t come out the…
Blockchain for Academic Credentials — Part 3 of 3: The Patterns Across Parts 1 and 2, a theme kept surfacing: most of a credential system runs on digital signatures, and the blockchain only shows up in a few specific places. This final part makes that precise. “Blockchain diploma verification” isn’t one architecture — it’s three,…
Blockchain for Academic Credentials — Part 1 of 3: A Reality Check Every few months, someone rediscovers a great startup idea: use blockchain to stop diploma fraud. Credentials get forged, employers can’t easily verify them, and blockchain is tamper-proof — so surely this is a match made in heaven. I thought so too, until I…