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News
Parse crypto amounts like hostile input, declare rounding first
16+ hour, 48+ min ago (712+ words) I have been building payment and crypto systems in production since 2018: custodial wallets for BTC and ETH, a fiat-to-crypto onramp, exchange order books, stablecoin rails in daily use. The amounts that gave me the most trouble were not the large…...
JWKS and Session Verification Explained — 5 Recovery Paths for Fintech APIs
4+ day, 1+ hour ago (598+ words) Short answer: use JWKS verification to establish that a token was signed by an accepted issuer, then use session verification to decide whether that still-valid token should be allowed to act. For a fintech API rotating refresh tokens after a…...
Zero Dependencies Sounds Easy Until You Have to Build Everything Yourself
4+ day, 13+ hour ago (364+ words) We built a dead-man's-switch for your crypto wallet. Then we broke our own encryption on purpose, just to make sure we knew how to fix it. Team Name: FemTech Team Members: Umaima, Zunairah, Alizah Track E — Security & Crypto Utilities Zero…...
Here's my app's access control, the passwords, and a curl command. Go break it
6+ day, 9+ hour ago (548+ words) I moved my app's authorization below the application code. Here is the live demo, the passwords, and the curl commands to try to break it. The thing that bothers me is that this is re-litigated in every codebase. The rule…...
Goodbye Middlemen: How I Built an Open-Source, Bankless Donation Widget for the Dev Community
6+ day, 18+ hour ago (445+ words) DEV Weekend Challenge: Generosity Edition Submission 💜 This is a submission for Weekend Challenge: Generosity Edition DonateX — an open-source, 3KB donation button that accepts USDC on Base Network. Zero platform fees. Zero KYC. Zero bank accounts required. One line of HTML. The…...
I Rejected My Reference Tools' Assumptions, Then Inherited One
1+ week, 3+ hour ago (739+ words) I built a loan calculator because the ones I was using assumed something wrong about how a borrowing decision happens. I caught that assumption early and designed against it. Then I built extra-payment handling, tested it, and considered it done....
Validate Card Brands in Node.js with Luhn and credit-card-brand-detector
1+ week, 17+ hour ago (752+ words) When a checkout form receives a card number, the first useful question is often not whether the payment will be approved. It is whether the input is structurally plausible and which network rules should be shown to the user. The…...
Break-even is not a profit, and my calculator said it was
1+ week, 1+ day ago (678+ words) Refinance a 200,000 mortgage. Current rate 7%, 300 months left. New rate: 7%. New term: 25 years. Closing costs: 4,000. That is not a refinance. It is the loan you already have, plus a bill for four thousand. My calculator, in green: The number is right....
Three ways your dashboard can be correct and still lie
1+ week, 1+ day ago (567+ words) Our dataset said the average loan was 2.3 million kroner. The number that actually mattered was 255,000. Both were correct. Only one of them was true. This is a writeup of three ways a dashboard can be arithmetically perfect and still lie,…...
Why I Built ToolVerse: A Solo Developer’s Journey to Making Financial Clarity Private and Free
1+ week, 2+ day ago (211+ words) Can I Afford This? 1. The Story Behind the Code Every developer knows the late nights, the stubborn bugs, and the quiet satisfaction of seeing a project finally come to life. For the past few weeks, my world has revolved around…...