OpenBitcoin

OpenBitcoin is a Bitcoin-only block explorer that serves every figure from its own Bitcoin Core full node and its own address index. No third-party blockchain API sits between the chain and the page, and the code behind the measured numbers is published, so any figure can be rebuilt on your own node.

Blocks, transactions and addresses resolve at the root of the domain. An address page carries the full lifetime history: balance, total received and total sent, unspent output count, first seen, last activity, and the fiat value of every transaction both at the time it confirmed and today. Alongside the explorer there is a rich list ranked live from the same index, a balance distribution computed from the node's own UTXO snapshot, mempool and fee-rate views, a halving countdown driven by the live block height, and a census of reachable nodes measured by a Bitcoin protocol handshake crawler the site runs itself rather than a count borrowed from another census.

The site is open source, and so is the code behind the measured numbers: the node crawler and the address indexer are both published under the MIT license. What stays private is the hosted instance's operational layer, meaning server configuration, rate limiting, caching and abuse defenses. Nothing in that layer changes a number; it only keeps a free public instance standing.

No accounts, no registration, no tracking of what you look up. Bitcoin only, with no altcoin listings, tokens or inscriptions.