Is my Bitcoin public key exposed?

If you have EVER sent Bitcoin from an address, your public key is exposed on the blockchain forever. Only addresses that have NEVER sent outgoing transactions have unexposed public keys.

How can I check if my Bitcoin is at quantum risk?

Check your address on a blockchain explorer. If it shows any outgoing transactions, your public key is exposed. Legacy P2PKH addresses starting with 1 are most at risk.

What percentage of Bitcoin is quantum vulnerable?

6.04 million BTC - 30.2% of total supply, roughly $469 billion (Glassnode, May 2026) - are in addresses with exposed public keys, making them immediately vulnerable when quantum computers become capable. That splits into 1.92 million structurally exposed in P2PK outputs and 4.12 million operationally exposed through address reuse.

🔑 Is Your Public Key Exposed?

Bitcoin Quantum Risk Calculator

📋 How Public Keys Get Exposed

Fresh Address

Only receive, never send

✅ Public key hidden

→

First Send

You sign a transaction

⚠️ Signature created

→

Forever Exposed

Public key on blockchain

🔴 QUANTUM VULNERABLE

🧮 Quantum Risk Assessment

Address Type	Ever Sent From?	Public Key Status	Quantum Risk
Legacy (1...)	Yes	EXPOSED	🔴 CRITICAL
Legacy (1...)	No	Hidden	🟡 Medium
SegWit (3... or bc1q...)	Yes	EXPOSED	🔴 CRITICAL
SegWit (3... or bc1q...)	No	Hidden	🟡 Medium
Taproot (bc1p...)	Yes	EXPOSED	🔴 CRITICAL

Note: Even "hidden" keys become exposed the moment you spend. And once quantum computers arrive, you can't safely spend without exposing yourself.

🔍 Check Your Address

Go to a blockchain explorer (blockchain.com, blockstream.info)
Enter your Bitcoin address
Look for "Sent" transactions
If ANY exist → Your public key is EXPOSED

📊 The Exposure Statistics

6.04M BTC In exposed addresses

~$469B Value at immediate risk

30.2% Of circulating supply

1.92 million BTC are structurally exposed in P2PK outputs — their public keys have been on-chain since the day they were mined, including roughly 1.1 million attributed to Satoshi. Another 4.12 million were exposed operationally, by address reuse. Of the 6.04 million total, about 2.3 million is irreversibly at risk; the other 3.7 million belongs to people who could still move it. Source: Glassnode, May 2026.

🛡️ Migrate Before Quantum Arrives

Don't wait until your exposed keys become exploitable:

Download SynX Wallet Migration Guide