Bitcoin Core

Satoshi's code had a COIN and a CENT and nothing smaller with a name. Bitcoin's smallest unit, the satoshi, was named by users on BitcoinTalk two months after his last post.

In 2008 Satoshi wrote that only coin creators would eventually need to run nodes. Mining did leave ordinary computers; nodes did not. Who runs the 25,489 reachable addresses, and why, with no reward.

On October 3, 2026, 12,524 of the 25,501 Bitcoin addresses a crawler could reach were Tor onions. What the count measures, how it grew from Satoshi's 2009 proxy line, and why nodes hide their IP.

In August 2010 a forum user asked whether Satoshi could withstand torture for Bitcoin's alert key. What the key could do, whose hands its copies reached, and how it left the network by 2018.

Asked in April 2013 how a decentralized currency came to have a chief scientist, Gavin Andresen answers with the Bitcoin Faucet, his code, and Satoshi swapping his own email address for Andresen's.

Matt Corallo joined Bitcoin Core in 2011, co-founded Blockstream in 2014, authored BIP 152's Compact Block Relay, built the FIBRE relay network, then moved on to Chaincode Labs and Spiral.

American Bitcoin infrastructure engineer. Built Statoshi node telemetry (2014), was SWATted at his home in 2017, joined Casa (2018), and wrote "Who Controls Bitcoin Core?" (2018).

Wrote BIP 1, the document that defined the Bitcoin Improvement Proposal process. Founded libbitcoin and Dark Wallet. In 2015 he left Bitcoin to fight ISIS in Syria, was arrested, and never charged.

A source-level map of Bitcoin v0.1: the byte boundaries for transaction, block, and signature hashes, and the reuse of one serializer across network and disk paths.

Five AI models were asked the same question and independently picked the same coin. Fact-checking their reasons: structural claims held up, confident superlatives mostly did not.

No block-size limit, one company's reference client, and five 51%-attack reorgs in a single year — Bitcoin SV's design record, measured against the 'original protocol' it set out to restore.

Registered dogecoin.com as a joke about altcoin proliferation, left the community in 2015, called Bitcoin cult-like in 2018, and in 2021 rejected the whole industry in public.

Weighing the 'Blockstream controls Bitcoin' charge against the documentary record: where it comes from, and how each link in the chain holds up.

Cross-cutting reading of Bitcoin's 2015–2017 block-size war by phase, faction, and turning point: Bitcoin XT, BIP148 UASF, the New York Agreement, Bitcoin Cash, SegWit2x cancellation.

Satoshi's difficulty retarget has an off-by-one: it measures 2,015 blocks instead of 2,016. A hashrate majority can exploit it via timestamp manipulation. The Great Consensus Cleanup proposes a fix.

Bitcoin's 'digital gold' status rests on two layers of decentralization — system and people/organization — and six structural features no later cryptocurrency combines to the same degree.

Cross-cutting architecture comparison across every subsystem: Satoshi's v0.1 (January 2009) side by side with modern Bitcoin Core v27+, with split diagrams and domain tables.

How the Bitcoin ecosystem layers above and around the base chain: Lightning payment channels, federated sidechains, L1 envelope extensions, and mining pool architectures.

Bitcoin's threat model mapped end-to-end: what the protocol trusts, what it defends against, how each attack is countered, and where open risks remain.

How Bitcoin Core persists blocks, maintains the UTXO set, indexes chain state, manages the mempool, prunes historical data, and bootstraps via assumeUTXO.

How Bitcoin Core manages keys, constructs transactions, selects coins, estimates fees, and exposes functionality through RPC, REST, and ZMQ interfaces.

How Bitcoin uses elliptic-curve keys, digital signatures, hash functions, and deterministic derivation to secure ownership without trusted third parties.

How Bitcoin's 21 million cap emerges from a geometric halving series, how block rewards transition from subsidy to fees, and how the incentive model sustains honest mining.

How Bitcoin nodes find each other, exchange transactions and blocks, and resist network-level attacks across the P2P gossip layer.

How Bitcoin nodes agree on a single chain: SHA-256d proof of work, the difficulty adjustment algorithm, block validation rules, fork resolution, and probabilistic finality.

How Bitcoin blocks are structured, how Merkle trees commit transactions to block headers, and how the most-work chain selection rule resolves forks.

Deep-dive into Bitcoin's transaction layer: UTXO lifecycle, transaction structure, Script evaluation, ECDSA and Schnorr signatures, SegWit, and Taproot.

High-level system overview of Bitcoin's architecture, layer model, and data flow. Entry point to a 12-page design-document series covering every major subsystem.

Where Bitcoin's current reality has drifted from Satoshi's design intent: four axes — mining (one-CPU-one-vote to ASIC oligopoly), custody (own keys to exchange IOUs), governance, and scaling.

Satoshi coded Bitcoin on Windows for 27 months, mainly with MinGW. In November 2009 he finished the Linux build Martti Malmi had started; by mid-2010 there were Windows, Linux and Mac releases.

What Satoshi's design assumed about a fee-only future, and the documented debate over whether transaction fees alone can sustain proof-of-work security after the block subsidy ends around 2140.

Structural reading of the 2010-08-15 overflow incident — soft-fork rescue mechanics, why a 5-hour response was only achievable then, transaction-shape forensics, and the centralization paradox.

Why Bitcoin's 2015-2017 fork wars ran as identity contests, not OSS disputes: the post-2011 authority vacuum, the economic weight on rule choices, and the three layers that bound code to currency.

American engineer. Pre-Bitcoin HTTP/2 (SPDY) contributor. Co-founded BitGo for institutional Bitcoin custody. Signed and then cancelled the New York Agreement / SegWit2x (November 2017).

French software engineer. Founded Bitcoin ABC, led the 2017 BCH hard fork, defended BCH in the 2018 BSV hash war, led the 2020 split into eCash.

Russian-Canadian programmer (1994–). Bitcoin community member from 2011, Bitcoin Magazine co-founder, pybitcointools author, Ethereum whitepaper author (late 2013).

Genealogy of every Bitcoin protocol fork that left a separate chain alive (Bitcoin Cash, SV, Gold) and the adjacent cryptocurrencies derived from Bitcoin (Namecoin, Litecoin, Dogecoin).

Vincent Durham launched Namecoin on April 18, 2011 — the first altcoin and first fork of the Bitcoin codebase. It implemented the BitDNS proposal as a decentralized name registration system.

Mike Hearn and Gavin Andresen released Bitcoin XT 0.11A, a Bitcoin Core fork implementing BIP 101 — 8 MB blocks doubling every two years. The launch opened the public phase of the block-size war.

Mike Belshe suspended the SegWit2x hard fork on the mailing list, about a week before the planned 2 MB activation at block 494784. The New York Agreement collapsed without a chain split.

On November 21, 2011, Bitcoin v0.5 shipped with the Crypto++ SHA-256 subset removed and replaced by OpenSSL. Wei Dai's library, a direct codebase dependency since v0.1, was gone.

b-money is whitepaper reference [1], his Crypto++ shipped inside Bitcoin v0.1, and he was the second person Satoshi contacted. The evidence for Wei Dai as Satoshi, weighed.

Hanyecz recalls his Satoshi correspondence around the April 19, 2010 macOS port. The private emails are unreleased; quotes are from later interviews. He called Satoshi paranoid, bossy, and weird.

A reply that read like the continuation of Satoshi's thought — and two days later, Satoshi went silent. The evidence for HBO's Peter Todd identification, weighed.

Recurring Satoshi candidates aligned across four independent layers — profile match, stylometric attribution, direct correspondence, and development environment.

After Len Sassaman's death (July 3, 2011), security researcher Dan Kaminsky embedded an ASCII-art tribute into the Bitcoin blockchain, announced July 30 and revealed at Black Hat USA 2011.

Editorial forensic reading of Satoshi's operational environment during Bitcoin v0.1 launch week (Jan 8-12, 2009): "from where I am" in the Jan 12 email to Finney, and dense activity cadence.

Technical analysis of Bitcoin's genesis block from v0.1 source: hardcode auto-construction, the five-day gap as timestamp artifact, two-layer authorship reading, PoW headroom, key possession.

American developer (luke-jr), long-tenured Bitcoin Core contributor. Maintains Bitcoin Knots; co-founded Ocean mining pool (2023). Suffered a $3.5M+ wallet theft in late 2022 (compromised PGP key).

Long-time Bitcoin Core contributor (gmaxwell), Blockstream co-founder, co-developer of libsecp256k1. Authored CoinJoin, co-designed Confidential Transactions. Known for deep technical write-ups.

Belgian software engineer (sipa), Bitcoin Core committer since 2011. Author/co-author of BIP-32, BIP-141 (SegWit), BIP-340/341 (Schnorr/Taproot). Initiator of libsecp256k1; Blockstream co-founder.

Dutch developer (handle laanwj). Built the original bitcoin-qt GUI; succeeded Gavin Andresen as Bitcoin Core lead maintainer (April 2014 - August 2022); withdrew merge privileges in February 2023.

On January 15, 2016, Bitcoin Core v0.12 replaced OpenSSL with libsecp256k1 — Wuille and Maxwell's custom elliptic-curve library — for consensus-critical ECDSA verification.

Peter Todd's first BitcoinTalk post, 41 seconds after registering as retep — offering $2 USD (not BTC, unlike others) for a Diaspora invite. His second post was a technical reply to Satoshi.

BIP 125 formalized opt-in Replace-by-Fee (RBF), tracing directly to Satoshi's December 2010 BitcoinTalk replacement mechanism — the thread where Peter Todd made his second-ever forum post.

HBO documentary Money Electric (Cullen Hoback) named Peter Todd as a Satoshi candidate, citing a 2010 BitcoinTalk reply about RBF and Todd's later BIP 125. Todd called the claim ludicrous.

Canadian cryptographer, Bitcoin Core developer. Proposed Replace-by-Fee, built OpenTimestamps. Joined BitcoinTalk as retep in Dec 2010. Named a Satoshi candidate by HBO in 2024 (denied).

In a CoinGeek interview, Mike Hearn offers rare reflections on Satoshi's personality — observing he enjoyed experimenting but appeared to grow frustrated when evangelical personalities arrived.

Finnish developer (born 1988); Bitcoin's most prolific early contributor after Satoshi. Exchanged ~260 emails with Satoshi, ran bitcoin.org, started the Linux port, did the first BTC-to-fiat sale.

Software engineer (born 1974), Linux kernel contributor, Red Hat employee. Discovered Bitcoin via Slashdot in July 2010. Top-3 Bitcoin Core contributor, built cpuminer, wrote BIPs, co-founded Bloq.

Software developer (born 1966), founder of Wasabi Software, creator of the Bitcoin Faucet. Chosen by Satoshi to lead the project; served as Bitcoin lead maintainer from 2010 to 2014.

Forensicxs published a line-by-line walkthrough of Bitcoin v0.1's 31,794 lines of source code, covering all 31 files.

No single day handed Bitcoin to Gavin Andresen: his own commits from October 11, a server-admin pick on December 3, Satoshi's last post on December 12, and his December 19 announcement.

Mike Hearn's private email correspondence with Satoshi Nakamoto, in which Satoshi stated he had 'moved on to other things' and that Bitcoin was 'in good hands with Gavin and everyone.'