claude-dev-suite Stratum V2
Modern protocol replacing Stratum V1. Designed by Braiins (Slush Pool maintainers).
Spec: https://stratumprotocol.org/specification/.
Key improvements over V1
| Aspect | V1 | V2 |
|---|---|---|
| Encryption | None | Noise XK (per-message AEAD) |
| Authentication | Username string | Cryptographic identity |
| Coinbase control | Pool only | Miner choice (Job Declarator) |
| Tx selection | Pool only | Miner can construct own block |
| Bandwidth | Verbose JSON | Binary (compact) |
| Multiple sub-protocols | No | Mining + Job Declaration + Template Provider + Job Negotiation |
Architecture
Multi-role:
- Mining Protocol: ASIC ↔ pool/proxy.
- Job Declaration: miner declares their preferred block content.
- Template Provider: external service builds block templates from mempool (e.g., user's own bitcoind).
- Job Negotiation: pool and miner negotiate work assignment.
A miner running a Template Provider locally can:
- Build their own block template from their own bitcoind mempool.
- Submit hash work for that template via Job Declaration to pool.
- Pool verifies + accepts.
- Miner finds block, gets reward.
This decentralizes tx selection: miners — not pools — choose which txs to mine.
Encryption
Noise XK handshake → ChaCha20-Poly1305 per message. Modern crypto; defeats MITM and on-path analysis.
Channels
- Standard channel: per-miner, simple.
- Extended channel: pool-controlled, used for proxies.
- Group channel: bundled connections.
- Job Negotiator channel: separate negotiation.
Status (late 2025)
- Reference impl: SRI (Stratum Reference Implementation), Rust.
- Production: Braiins Pool runs SV2.
- Adoption: limited — most pools still on V1.
- ASIC support: growing; firmware updates needed.
- Datum by Ocean Mining: SV2-compatible, decentralized template provider.
Use cases
- Censorship-resistant mining: miners choose own tx set.
- Independent miners: solo or small farms running their own bitcoind.
- Pool diversity: more easily switching pools.
Limitations
- Adoption lag — pool + ASIC + firmware all need to support.
- Complexity — multi-role architecture vs V1's simplicity.
- Backwards compat — many ASICs don't support yet.
Implementations
- Stratum Reference Implementation (SRI) —
github.com/stratum-mining/. - Braiins OS+ — firmware with V2 support for some Antminer models.
- Ocean Mining Datum — V2-style decentralized template.