Show HN: Free textbook on engineering thermodynamics https://ift.tt/jiDy2Ce

Show HN: Free textbook on engineering thermodynamics Author here. Feel free to send questions of any kind. https://ift.tt/45n3g0J April 26, 2026 at 07:17PM

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Show HN: Odozi – open-source iOS journaling app https://ift.tt/XGjbig8

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Show HN: I'm 15 and built a cryptographic accountability layer for AI agents https://ift.tt/VSo86tr

Show HN: I'm 15 and built a cryptographic accountability layer for AI agents i'm 15 and a sophomore in high school in california. for the past two weeks i've been building a protocol that lets you prove what an AI agent actually did. not just log it. prove it. signed receipts before and after each action, hash chained, verifiable by anyone. this week microsoft merged my code into their agent governance toolkit. twice. happy to answer questions about how it works. https://ift.tt/Du7cfB4 April 24, 2026 at 10:56PM

Show HN: #1 On This Day https://ift.tt/VP5zOyb

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Show HN: Agent Vault – Open-source credential proxy and vault for agents https://ift.tt/2pN0JCV

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Show HN: Tron Hilbert Curve Macro https://ift.tt/4t1JiLE

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