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B10c. I’m interesting in Bitcoin, data, and have been monitoring the Bitcoin networkfor a few years now.
News
Matching Hashes: Reproducing the Guix-built Bitcoin Core release binary with Nix
Earlier this week, I produced a Nix-built bitcoind binary for Bitcoin Core v31.0 whose hash exactly matches the official Guix-built x86_64-pc-linux-gnu release binary. The result came out of a three year old side project, with a difficult goal: Can a bina
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Bitcoin Mining Centralization in 2025
This post explores Bitcoin Mining Centralization in 2025 by looking at the hashrate share of the current five biggest mining pools. It presents a Mining Centralization Index and updates it with the assumed proxy pooling by AntPool & friends. It shows that
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Vulnerability Disclosure: Wasting ViaBTC
In January, while investigating a misbehaving client on the Bitcoin P2P network, I found a vulnerability in ViaBTC's, the fourth largest Bitcoin mining pool, SPV mining code that allowed a remote attacker to waste ViaBTC's 60 EH/s hashrate by sending a si
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LinkingLion: An entity linking Bitcoin transactions to IPs?
This post describes and discusses the behavior of an entity I call LinkingLion. The entity opens connections to many Bitcoin nodes using four IP address ranges and listens to transaction announcements. This might allow the entity to link newly broadcast t
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