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Bitcoin AmsterdamBitcoin Amsterdam
NOV 5-6, 2026 · Amsterdam
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Martti Malmi

Martti Malmi

Sirius Business Ltd

Bitcoin Amsterdam
Speaker

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Martti Malmi, also known as Sirius, is the Finnish developer who worked directly with Satoshi Nakamoto as Bitcoin's second contributor, building the early software, the bitcoin.org site, and the first community forum. He made one of the first known Bitcoin-for-fiat sales, 5,050 BTC for about $5 via PayPal in 2009, and in 2024 released his archive of Satoshi emails as evidence in the COPA v. Craig Wright trial. Today he develops Nostr VPN, Iris Chat, Iris Drive and other permissionless alternatives to everyday digital tools.

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