Forum: discuss every block
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- General bitcoin discussion1 post ·
Anything bitcoin that doesn't fit a specific block: price, news, ideas, questions.
Sessions, speakers and news from Lugano: BIP-110, Coldcard, quantum, treasury companies.
Found a bug, missing data or have an idea for a new block? Tell us here.
- Blog @kubalskiy: Hot take: the most important talk in Lugano isn't Ardoino or Adam Back. It's the BIP-110 post-mortem. Only 2.53% of hashrate signaled, the …
- General bitcoin discussion1 post ·Forum @kubalskiy: Welcome to the 21btc forum! Discuss any chart, number or article on the site: ETF flows, on-chain models, halving cycles, security guides. …
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Bitcoin data
Live bitcoin block height, hashrate chart, next difficulty adjustment, fee rates, mempool size and countdown to the 2028 halving.
Daily net flows for every US spot bitcoin ETF, cumulative inflows since January 2024 and how much BTC the funds hold.
Bitcoin held by public and private companies, ETFs and funds, governments and exchanges, with the largest holders and 7-day changes.
MVRV, realized price, NUPL, SOPR, LTH/STH, power law, stock-to-flow, Mayer multiple, 200-week MA and Puell multiple, explained simply.
Rainbow chart on real price history, halvings, cycle tops and bottoms, drawdowns and all cycles side by side. Educational, not advice.
Buy, store, learn
Hardware and paper cold wallets compared, whale wallets, Whale Alert transfers, exchange reserves and BTC-backed credit.
Where bitcoin trades (CEX, DEX, P2P), plain-language buying approaches and a DCA calculator on real historical prices.
Live tracker of stablecoins on Bitcoin layers: Tether USDT on Liquid, Omni, Taproot Assets and RGB, Brale USDB on Spark, DePix, Stable Channels. Status, supply, wallets,…
Compare BTC-backed loans from banks and lenders: rates, loan-to-value, custody model and liquidation risk explained.
Bitcoin ASIC miner catalogue with live profitability, hashprice, break-even, mining pools compared (fees, payout schemes, stratum URLs) and bitcoin issuance by year.
Bitcoin from zero, a glossary and FAQ, plus security guides: seed backups, multisig, inheritance, verifying wallets and running your own node.
News & events1 post
- Blog1 post ·
Short articles on what matters in Bitcoin: protocol debates, security incidents, companies, conferences and history. Every fact is sourced; expectations are labelled.
Latest bitcoin news and large on-chain transfers tracked by our desk.
Bitcoin-only conferences in 2026 and 2027 with dates, cities and links, plus Token2049 and Korea Blockchain Week side events.
Genesis Day, Pizza Day, Whitepaper Day and other Bitcoin holidays, a live countdown to the next halving and upcoming conferences. Download as .ics.
People, tools & history
Bitcoin Core maintainers and contributors, Bitcoin-only voices on X and Bitcoin YouTube channels, each verified, with follow buttons.
Directory of bitcoin voices and influencers with topics and links.
Free check of a Bitcoin address or transaction against the official OFAC SDN list, known exchange addresses and blockchain data. Not a full AML check.
Interactive Bitcoin history: whitepaper, genesis block, Pizza Day, halvings, SegWit, Taproot, ETFs. Famous blocks and transactions, Satoshi quotes and early prices, all …
Mt. Gox, Bitfinex, Bitstamp, Binance, DMM and more: BTC stolen, value then and at today's price, what happened to the coins. Lost coins estimates and the Pizza Day story.
Bitcoin-themed art and collections.
Blog articles
All articles →119 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.
On 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.
A 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.
There is no post-quantum signature in Bitcoin yet. Blockstream's research team has the most concrete design so far. A plain-language guide before the Lugano talks.
Rapha Zagury replaced Jack Mallers as CEO of Twenty One Capital in July. On 24 October he speaks in Lugano, and Jimmy Song debates Capital B on treasury companies.
Since March 2022 the Swiss city has accepted bitcoin for taxes and public services. What the city says it has achieved, what is new this year, and which Lugano sessions …
Software agents need a way to pay for data and services without a credit card or an account. Lightning Labs has published open-source tools for exactly that. A plain-lan…
In 1997 Adam Back proposed making every email cost a little computing work. Eleven years later the Bitcoin whitepaper cited it. On 23 October he tells the story in Lugan…
The technical Bitcoin conference starts on 12 October. Its schedule is built in the open on GitHub. Eight sessions worth watching, with times in Atlanta and Moscow.
A new research proposal borrows Zcash's design to hide amounts and counterparties on Bitcoin as it is today. What it promises, what it costs, and what is still missing. …
Since 1 January 2026, EU crypto service providers must collect customer and transaction data for tax authorities. What DAC8 means for you, and what happened to Bull Bitc…
The agenda for 5–6 November is out: 66 sessions on four stages. The panels on how Bitcoin should change, Bitcoin's first days, AI red teams, EU rules and self-custody, w…
bitcoin++ holds its first Korean edition on privacy on 5–6 November, then the Bitcoin Korea Conference runs on 7–8 November. Agendas, highlights and Seoul/Moscow times.
From pool protocols in Atlanta to home miners in Seoul and Bangkok and the AI energy race in Amsterdam: a plain guide to the mining debate, with every session time in lo…
Bangkok's Bitcoin conference on 28–29 November is built for a local audience: talks in Thai and English, merchant tools, tax, kids' workshops and a new hardware wallet. …
Since November 2024, Screven County has anchored election records to Bitcoin without putting the records themselves on chain. How it works, what it proves and what it do…
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