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Second Bitcoin developerGenesis✓ Verified
Martti Malmi
Satoshi's first collaborator on the code and the website.
Known as sirius, sirius-m, Martti MalmiActive May 2009 →
Why they matter
Malmi did much of the unglamorous infrastructure work — website, forum, documentation — that let an outside community form around Bitcoin at all. His preserved email exchanges with Satoshi are a key historical record.
Profile
Finnish developer (handle "sirius") who reached out to Satoshi in 2009 and became the second person to work on Bitcoin. He helped rewrite parts of the client, set up the original bitcoin.org website and the forum, and handled some of the earliest BTC-for-fiat exchanges.