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21 BTC is a free, Bitcoin-only research site: live market and network data, spot-ETF flows, who holds BTC, a conference calendar and in-depth analysis. No sign-up, no paywall.
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✍ Plan ₿ Forum 2026 in Lugano: what to watch on 23–24 October Lightning Network guide Stablecoins on Bitcoin Mining pools compared Solo miners Printable seed backupsExplore
Network live →Blocks, hashrate, fees, difficulty and the halving countdown.Bitcoin ETFs →Daily US spot-ETF flows by fund, with history.Who holds BTC →Companies, funds and governments holding bitcoin.On-chain & models →MVRV, realized price, supply and valuation models.Rainbow & cycles →Halving cycles and long-term price bands.Chart analyst →Live BTC candles, MA/RSI and plain-language answers about levels.Wallets & self-custody →Hardware wallets, seed backups in steel and on paper.Lightning Network →How Lightning works, live capacity, wallets and nodes.Buy & trade BTC →DCA, exchanges, wallets and strategies compared.Bitcoin calendar →Conferences, halvings, upgrades and key dates.Blog →Conference previews, protocol debates, security and history.Learn →Bitcoin explained, from first sats to self-custody.Hacks & losses →Major Bitcoin hacks and losses, with lessons for self-custody.Bitcoin Museum →Milestones of Bitcoin history, from the white paper on.News →Bitcoin headlines from trusted sources.
Latest analysis
All posts →- Plan ₿ Forum 2026 · Preview · 10 Oct 2026Plan ₿ Forum 2026 in Lugano: what to watch on 23–24 October119 speakers and 92 sessions over two days. The talks that matter for Bitcoin, with times in Lugano and Moscow, and a clear line between facts and expectations.
- Protocol · Explainer · 10 Oct 2026BIP-110 post-mortem: why a soft fork backed by 2.5% of miners stalled after two blocksOn 8 August 2026 nodes enforcing BIP-110 split from Bitcoin at block 961,632. Here is what happened, why the new chain froze, and what it means for you.
- Security · Checklist · 10 Oct 2026The Coldcard seed bug: what happened, who is at risk, and a 7-step checklistA 2021 firmware mistake made some Coldcard seeds guessable. Since 30 July 2026 attackers have taken around 1,400–2,050 BTC. What went wrong and what to do now.
Upcoming conferences
Calendar →- TABConf 8Atlanta, USA12 Oct–15 Oct
- Plan ₿ WeekLugano, Switzerland19 Oct–28 Oct
- The Future of Capital MarketsLugano, Switzerland22 Oct
- Plan ₿ Forum: pre-registrationLugano, Switzerland22 Oct
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