Key Numbers
- 4.12 M BTC — Quantum‑exposed supply, more than double the 1.92 M BTC previously flagged (Glassnode, Q1 2026)
- 20% — Portion of total Bitcoin supply at quantum risk (Glassnode, Q1 2026)
- 4.12 M BTC / 21 M total — 19.6% of all Bitcoin, a near‑quarter of the network (Glassnode, Q1 2026)
- 4.12 M BTC — 10.5× the amount exposed by older script types (Glassnode, Q1 2026)
Bottom Line
Glassnode confirmed that 4.12 million BTC are quantum‑exposed, a figure that dwarfs prior estimates. Investors holding these coins face immediate security risk as quantum computers approach feasibility.
Glassnode’s latest analysis shows 4.12 million BTC are quantum‑exposed, more than double previous counts. Holders of these coins must consider migrating to quantum‑resistant wallets to protect their assets.
Why This Matters to You
If you own any of the 4.12 million quantum‑exposed BTC, your coins could be compromised once quantum computers become practical. Migrating to a quantum‑resistant wallet is now urgent to safeguard your holdings.
Quantum Exposure Rises to 20% of the Supply — Wallets Must Adapt
Glassnode’s research shows that 20% of all Bitcoin are at risk from quantum attacks, a dramatic jump from the 9.1% figure reported last year. The surge stems from widespread address reuse, partial spending, and custody practices that expose public keys (Glassnode, Q1 2026). This shift signals that the protocol’s design is no longer the sole source of risk; user behavior now drives vulnerability.
On‑Chain Indicators Reveal Growing Risk Appetite Among Custodians
Custody firms now hold a larger share of the quantum‑exposed supply, as they often reuse addresses for efficiency. Their practices amplify exposure, creating a systemic threat that could ripple across the network (Glassnode, Q1 2026). This trend underscores the need for industry‑wide protocol changes or wallet upgrades.
Investor Action Plan: Migrate Before Quantum Breaks Through
The most effective defense is to move exposed coins into new, quantum‑resistant addresses. Wallet providers are already offering migration tools, but the process must be completed before quantum capabilities reach commercial viability (Glassnode, Q1 2026). Delaying action could result in irreversible loss.
What to Watch
- Watch BTC/USD for a potential dip if quantum news sparks panic (this week)
- Follow Quantum Computing Institute releases on quantum‑ready coins (next month)
- Monitor Ethereum 2.0 for cross‑chain quantum‑resistance upgrades (Q3 2026)
| Bull Case | Bear Case |
|---|---|
| Rapid wallet migrations could bolster network security and attract institutional trust (Glassnode, Q1 2026) | Quantum exposure may trigger a sell‑off as holders flee risk, depressing BTC price (Glassnode, Q1 2026) |
Will the Bitcoin community act fast enough to neutralize quantum risk before it becomes a reality?
