The original Bitcoin site, online since 2009 and community-maintained. Holds the whitepaper, an explanation of how Bitcoin works, a directory of wallets with the trade-offs of each spelled out, and guidance on choosing one. Not a company site — no product to sell you.

Blockchain.com, launched in 2011 as the first Bitcoin blockchain explorer, enables users to track transactions, blocks, and addresses on the Bitcoin network with real-time data. Its tools include a cryptocurrency wallet for secure asset storage with private key control, fee estimation to optimize transaction costs, and detailed data analytics for network insights. It’s a robust platform for exploring blockchain activity and managing crypto holdings.

Stacks is a Bitcoin Layer 2 that adds smart contracts and decentralized apps while settling with Bitcoin finality. STX, the native token, pays transaction fees and executes contracts. The site is the ecosystem's hub — documentation, the roadmap, sBTC, Bitcoin Staking, and the wallets and applications built on the network.

The block explorer for Stacks. Look up any transaction, address, or smart contract; check whether a transfer confirmed and what it cost; read deployed contract code. Includes a browser sandbox for testing contracts without deploying them. Built and maintained by Hiro Systems.

Bitcoin Staking lets BTC holders earn yield paid in BTC without giving up custody. BTC is locked on Bitcoin L1 using a standard timelock under your own keys — not bridged, wrapped, or held by a third party — paired with STX to form a protocol bond. Yield comes from Proof of Transfer: Stacks miners commit real BTC every 10 minutes to compete for block rewards, and that BTC goes to stakers. Ratified by the Stacks community in July 2026; capacity is limited and allocated by bonding period.

sBTC is a 1:1 Bitcoin-backed asset on Stacks that lets BTC move into smart contracts and dApps without handing custody to an exchange. Deposits went live in December 2024, withdrawals in April 2025. Every transfer requires 70% consensus from the signer set and settles with Bitcoin finality.

The organization doing core protocol development on Stacks — consensus, sBTC, Bitcoin Staking, and the developer tooling around them. If you want to know where the network is headed rather than what it does today, this is the source: roadmap, engineering updates, and the SIPs that get ratified.

Moves USDC between Ethereum and Stacks in either direction. Maintained by Stacks Labs and powered by Circle xReserve, so the underlying USDC is issued by Circle rather than by a third-party wrapper. Roughly 15 minutes to confirm, 10 USDC minimum, with a small network fee.

Register .btc domain names through the Bitcoin Name System. A .btc name replaces a long wallet address with something readable, works as a Lightning Address so people can pay you like sending an email, and can bridge to conventional DNS. Names are registered by a Clarity contract on Stacks and anchored to Bitcoin. Now on BNS v2, with multiple names manageable from one account.

A management interface for BNS-V2 names on Stacks. Register names, renew them, set a primary name, transfer ownership, and create your own custom namespace — not just .btc. Also carries analytics and developer documentation for an API and SDK.

Mempool.space is an open-source Bitcoin blockchain explorer and mempool visualizer that provides real-time insights into unconfirmed transactions, transaction fees, and network activity. It offers tools like fee estimation, transaction tracking, and visual charts to help users, miners, and developers monitor the Bitcoin network and optimize transactions. Accessible online or self-hosted, it’s a trusted resource in the Bitcoin community for understanding the mempool and blockchain status.

A live census of reachable Bitcoin nodes worldwide. Shows how many are running, where they are, what software versions they use, and how the count changes over time — across IPv4, IPv6, and Tor. Running for over a decade, with a public API.