Original Bitcoin Laboratory
Paste a block, a script, or a spend and re-validate it on your device. This page runs the node's own Rust consensus core — the same validator the network uses — compiled to WebAssembly. No server, no network, no dependencies. Don't trust the lab; re-check the bytes.
loading the validator…
What this proves. The earliest Bitcoin survives as hash-identified source, and most claims about it circulate as lore. Here the actual validation — proof-of-work, the merkle commitment, coinbase placement, the script interpreter, ECDSA — runs in front of you, from the same Rust core the reconstruction's nodes run, so a result is something you regenerate, not something you take on faith. Everything is inside this one file: save it (Ctrl/⌘-S) and it works forever, offline, and device to device.
Not money. This verifies historical and experimental artifacts; nothing here holds, moves, or is worth anything. It is a reproducibility instrument, part of the Original Bitcoin Laboratory. Want to run a node or transact on the experimental chains? See PARTICIPATE.md.