JosephWang
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Thoughts on data science, machine learning, and research

Dec 28, 2025
: Solidity, Blockchain, Web3

From Services to Products: Composing Multi-Provider Checkout On-Chain

Imagine a mobile library. Readers don’t pay per book. They pay to enter the library for a period of time. Inside the library:
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Dec 27, 2025
: Machine Learning, Statistics, Deep Learning

From PCA to Barlow Twins: A Statistical View of Redundancy Reduction in Self-Supervised Learning

I originally found Barlow Twins confusing for a simple reason: it looks statistical on paper, but it doesn’t behave like PCA when you actually run ...
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Dec 21, 2025
: Solidity, Blockchain

Designing Rental Services on a Pay-As-You-Go Protocol

This is not a rental dApp tutorial. It’s a protocol design exercise under real-world constraints.
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Dec 16, 2025
: Solidity, Blockchain

Building Article Subscription Contracts in Solidity

The goal of this post is to design the on-chain payment and settlement layer for such a product, not a full dApp. We focus on how different article...
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Dec 11, 2025
: Solidity, Blockchain

Building a Simple Pay-as-You-Go Service in Solidity

I’m learning Solidity and wanted to apply some concepts to build a pay-as-you-go (PAYG) service contract as practice. I finished The Complete Solid...
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