regtest: add Fulcrum (Electrum/WS) with ZMQ push for Hal realtime

2026-06-27T18:00:08Z

Adds a regtest Fulcrum service matching what prod runs, replacing the old electrs + ews bridge as the data/realtime backend for the Hal browser wallet. It connects to `bc` and gets instant block/mempool notifications over bitcoind's ZMQ (hashblock/hashtx), serving them to the browser over an Electrum WebSocket (:50003) — sub-second deposit + confirmation updates on regtest. - docker/fulcrum.Dockerfile: Fulcrum on ghcr.io/coinos/base (shares layers with the rest of the stack instead of a separate image tree). - compose.fulcrum.yml: opt-in overlay (`-f compose.fulcrum.yml up -d`), config + datadir under the gitignored data/ (seeded from sampledata by setup.sh). - sampledata/fulcrum/fulcrum.conf: regtest config pointed at `bc`, ZMQ enabled. - sampledata/bitcoin/bitcoin.conf: add zmqpubhashblock/hashtx (18508/18509) so Fulcrum can subscribe for instant notifications. Co-Authored-By: Claude Opus 4.8

update sample config

2024-09-05T19:17:08Z

typescript

2024-08-27T04:17:43Z

liquid sample config

2024-02-01T19:52:57Z

update sample transaction script

2024-02-01T19:08:42Z

separate tips from amounts

2023-03-11T18:20:46Z

nostr config

2023-02-13T19:16:18Z

coinos-server.git/sampledata, branch regtest-fulcrum