SeedSigner
Cold Storage / HardwareSeedSigner is a DIY air-gapped Bitcoin signing device built from off-the-shelf Raspberry Pi components. Completely open-source. Stateless design — never stores keys. Camera-based QR code signing. Community-driven project.
Quick Verdict
With a Custody Score of 5.4/10, SeedSigner is ranked #7 of 7 among cold storage / hardware providers. Its strongest category is Fee Transparency and its weakest is Insurance.
Analysis
Score Breakdown
The Custody Score is a weighted average across 8 criteria, each rated 1-10.
| Criterion | Score | Weight | Weighted |
|---|---|---|---|
| Security | 8.5 | 20% | 1.70 |
| Insurance | 1 | 15% | 0.15 |
| Regulatory | 1 | 15% | 0.15 |
| Fee Transparency | 10 | 10% | 1.00 |
| Track Record | 6 | 15% | 0.90 |
| Withdrawal Flexibility | 8.5 | 10% | 0.85 |
| Reporting & Audit | 1 | 10% | 0.10 |
| Counterparty Diversification | 10 | 5% | 0.50 |
| Total | 100% | 5.4 |
Key Features
- ✓Stateless — never stores keys
- ✓DIY from off-the-shelf parts
- ✓Camera-based QR signing
- ✓Dice roll entropy
- ✓Fully open-source
- ✓Zero supply chain trust required
Fee Breakdown
| Setup Fee | ~$50 (Raspberry Pi Zero + camera + screen) |
| Annual Custody Fee | None |
| Transaction Fee | Network fees only |
| Withdrawal Fee | Network fees only |
| Notes | Build it yourself from off-the-shelf components. Truly zero trust. |
Security Details
Key Management
Stateless signing device
Cold Storage
100% (stateless)
SOC Compliance
N/A
Penetration Testing
No
Incident History: No known compromises
Insurance Coverage
Coverage
None — DIY self-custody
Carrier
N/A
Details
DIY project. No company behind it. No insurance possible.
Regulatory Status
Licenses
- N/A — open-source project
Community-driven open-source project. No company.
Pros & Cons
Pros
- Stateless — keys never stored on device
- Build from off-the-shelf components
- Zero supply chain attack surface
- Cheapest air-gapped signing solution
- Ultimate sovereignty and transparency
Cons
- DIY only — no pre-built option
- Not user-friendly at all
- No company support
- Requires significant technical skill
- Raspberry Pi availability can be limited