Bitcoin BLAKE2b in a tab
Four apps for txbt4, the BLAKE2b testnet4. Each is a browser tab that fetches the fork-point UTXO snapshot, checks its hashes, validates every block since the fork and follows the chain tip itself. Nothing on these pages is taken on anyone's word.

Reef the node and wallet
A Knots-style node in a tab: Overview, Send, Receive, Transactions, the Node window with its console. One key kept in the tab; sends published for a producer's node to broadcast.

Bight the mempool
A mempool monitor in the mempool.space shape. Every transaction shown was validated by the tab's own node, and the next block on the page is the one this tab would build.

Winch the miner
Solo mining in a tab. The block is built and checked by the tab's own node from its own mempool, hashed in the tab in testnet's twenty-minute window, and handed to the chain. Block 152,077 was mined this way.

Hitch payment channels
Lightning-shaped channels between tabs: a 2-of-2 funding output, revocable commitments, penalties for old states. Funded, watched and settled by the tab's own node; paid between tabs over the relays.