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I recently found PHPCoin, a blockchain written entirely in PHP. A niche project!

Repo: https://github.com/phpcoinn/node

Website: https://phpcoin.net

- A real, live L1 chain, with a small but active dev team

- Supports smart contracts, dapps, and web apps

- Readable and hackable PHP code

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Yes, the repo name has two n’s (`phpcoinn`) - phpcoin was already taken, so they added an extra n. Not a typo :)