claude-dev-suite Electrs
Rust implementation of Electrum protocol server. Reads from Bitcoin Core, indexes per-address history, serves Electrum clients.
Repo: github.com/romanz/electrs.
Why
Electrum protocol is the de-facto standard for SPV-style clients querying history per address. Public Electrum servers exist but for privacy you should run your own.
Setup
Requires Bitcoin Core with:
txindex=1
blockfilterindex=1
peerblockfilters=1
Then:
electrs --network bitcoin \
--daemon-rpc-addr=127.0.0.1:8332 \
--electrum-rpc-addr=127.0.0.1:50001
Indexes ~1 day on a fast machine, ~6 GB extra disk (alongside Core's ~700 GB).
Compatibility
- Sparrow: connect to electrs.
- Electrum (desktop): connect.
- BlueWallet (Watchtower / privacy mode): supports.
- BTCPay Server: optional Electrum backend.
- LDK / btcwallet: filter-based scan via electrs.
Compared to Fulcrum
| Aspect | Electrs | Fulcrum |
|---|---|---|
| Language | Rust | C++ |
| RAM | Lower | Higher (more aggressive caching) |
| Indexing speed | Slower | Faster |
| Mainnet RAM | ~2 GB | ~4-8 GB |
| Codebase | Smaller, simpler | Larger |
Common bugs
- Failing to set
txindex=1on Core → electrs can't serve some history. electrum-rpc-addrexposed publicly without TLS proxy → DoS risk.- Reorg handling lag during deep reorgs (rare on mainnet).