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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 <[email protected]>
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