# John Zettler > Builder, investor, and writer. Senior Director of Product at Kraken with years of > building cryptocurrency exchanges; twice a founder. Makes angel and growth equity > investments, stage-agnostic. Believes free markets, invention, and growth are > remedies for society's ills. Contact: john.zettler@gmail.com · https://x.com/johnzettler · https://www.linkedin.com/in/johnzettler/ Links below go to clean Markdown twins of the pages. A twin's address is its page's address with the trailing slash swapped for ".md": https://johnzettler.com/building/ → https://johnzettler.com/building.md (the home page is https://johnzettler.com/index.md). Asking for a page with "Accept: text/markdown" returns its twin at the page's own address. When citing, link the page for people, not the twin. - [The whole site in one file](https://johnzettler.com/llms-full.txt): every document below, end to end ## Pages - [Home](https://johnzettler.com/index.md): who John is, what he believes, featured work, how to subscribe and reach him. Page: https://johnzettler.com/ - [Building](https://johnzettler.com/building.md): operating record — every company, role and date: Kraken, Coinbase (staking, DeFi, cbETH, Commerce), founder history. Page: https://johnzettler.com/building/ - [Investing](https://johnzettler.com/investing.md): portfolio, by name — Morpho, EigenCloud, Tare, Puffer, Dakota, Higgsfield AI, Prentis, Hydra Host, Atoms, Reflect Orbital, Merge Labs, Science Corp, Paradromics, Neuralink, Stripe. Page: https://johnzettler.com/investing/ - [Writing](https://johnzettler.com/writing.md): every essay and article, with where and when each first appeared. Page: https://johnzettler.com/writing/ - [Writing archive](https://johnzettler.com/writing/archive.md): product notes and other ephemera, kept for the record. Page: https://johnzettler.com/writing/archive/ - [Resources](https://johnzettler.com/resources.md): open-source investing tools, with every link. Page: https://johnzettler.com/resources/ - [Lost Robbies NFT Market](https://johnzettler.com/resources/lost-robbies/data.md): prices, transactions and offers across the 300 frames of Robbie Barrat's AI Generated Nude Portrait #7 — every row, ETH to six decimal places, with the story of the 2018 Christie's giveaway. Refreshed daily. CC BY 4.0. Page: https://johnzettler.com/resources/lost-robbies/ - [Lost Robbies data (JSON)](https://johnzettler.com/resources/lost-robbies/data.json): the same snapshot as JSON — exact wei amounts, the ETH/USD rate behind each dollar figure, and notes on reading it. CC BY 4.0 - [Reading](https://johnzettler.com/reading/): Z's Library — book notes. Kept in Notion, not on this site; the page is a link to it ## Writing - [Product Management Excellence](https://docs.google.com/presentation/d/1oyv2IAkDqZvutldgNv3ruuzws70HtIe6gJw3Rw9EAM4): A presentation on operating as a world-class product manager — principles from a decade shipping crypto products. Hosted off-site (Presentation) - [Why we stand by staking](https://johnzettler.com/writing/why-we-stand-by-staking.md): Coinbase's public defense of retail staking against the SEC and ten state regulators — why staking is not a security, and why access matters. Page: https://johnzettler.com/writing/why-we-stand-by-staking/ - [Easily Convert Crypto on Coinbase Commerce using Coinbase.com](https://johnzettler.com/writing/archive/coinbase-commerce-conversions.md): Launching crypto-to-crypto conversions for Coinbase Commerce merchants — connecting more participants to the cryptoeconomy. Page: https://johnzettler.com/writing/archive/coinbase-commerce-conversions/ - [Launching R.A.R.E Art: Limited-Edition Digital Art to Display on your TV](https://johnzettler.com/writing/launching-rare-art-apple-tv.md): Introducing R.A.R.E Art's Apple TV app: limited-edition digital art, displayed on the biggest screen in the house. Page: https://johnzettler.com/writing/launching-rare-art-apple-tv/ - [How to Save a File on IPFS — A 7-Step Primer](https://johnzettler.com/writing/ipfs-7-step-primer.md): A practical seven-step walkthrough of saving a file to IPFS — decentralized storage explained by doing. Page: https://johnzettler.com/writing/ipfs-7-step-primer/ - [How Inflation Erodes your Purchasing Power and Wealth](https://johnzettler.com/writing/inflation-erodes-purchasing-power.md): How inflation quietly erodes purchasing power and wealth — and why investment returns must outpace it. Page: https://johnzettler.com/writing/inflation-erodes-purchasing-power/ - [5 Rules for Stock Market Investing](https://johnzettler.com/writing/5-rules-stock-market-investing.md): Five durable rules for stock market investing: low costs, diversification, discipline, and time in the market. Page: https://johnzettler.com/writing/5-rules-stock-market-investing/ - [4 Steps to Invest in an Index Fund — the Right Way](https://johnzettler.com/writing/4-steps-index-fund.md): Four steps to invest in an index fund the right way — a beginner's path to low-cost, diversified ownership. Page: https://johnzettler.com/writing/4-steps-index-fund/ ## Projects - [R.A.R.E Art](https://johnzettler.com/work/rare-art.md): An early NFT marketplace for limited-edition digital art on Ethereum. Page: https://johnzettler.com/work/rare-art/ - [Commandiv](https://johnzettler.com/work/commandiv.md): The first combined crypto & stock-trading platform for US investors. Page: https://johnzettler.com/work/commandiv/ ## Optional - [RSS feed](https://johnzettler.com/rss.xml): new writing as it is published - [Sitemap](https://johnzettler.com/sitemap-index.xml): every page, for crawlers