---
title: "Most bitcoin is already quantum secure · Bitsaga Insights"
description: "64.6% of all bitcoin has never shown its public key, so a quantum computer has nothing to attack. Measured on our own node at block 970,461."
url: "https://bitsaga.be/insights/most-bitcoin-is-already-quantum-secure"
language: "en"
---

> 64.6% of all bitcoin has never shown its public key, so a quantum computer has nothing to attack. Measured on our own node at block 970,461.
[Insights](https://bitsaga.be/insights) · Data

# Most bitcoin is already quantum secure

**64.6 percent** of all bitcoin has never shown its public key, so a quantum computer has nothing to attack. That holds until the coins move.

October 8, 2026

64.6%

of all bitcoin is quantum secure

- **12.98M BTC** quantum secure: only the address is on chain

- **7.11M BTC** public key on chain: quantum hackable

Each square is 1% of all bitcoin, about 200,000 BTC.

## What makes bitcoin quantum hackable

On chain **Public key** `03a1…c7f`

a quantum computer works out

**Private key** Quantum hackable

On chain **Address only** `bc1q…`

a quantum computer gets nowhere

**Nothing to attack** Quantum secure

Spending from an address puts its public key on chain. From then on, a quantum computer could work back to the private key.

## Why 7.11 million have their public key on chain

Address that has spent before

5.17M 25.7%

Paid straight to a public key, mostly in 2009 and 2010

1.71M 8.5%

Taproot address (bc1p…): it is the public key

222k 1.1%

## Most of that is old coins and a few big addresses

609 addresses

hold 3.31M BTC, 64% of all coins at addresses that have spent before.

97%

of the coins paid straight to a public key have not moved since 2009 or 2010.

## Is your bitcoin quantum secure?

Standard bitcoin address never spent from **Quantum secure**

An address you have already spent from **Public key on chain**

`bc1p…` (Taproot) **Public key on chain**

Your xpub, shared with an app or a server **Public key known**

## How to make it quantum secure

Your address now **Public key on chain**

→ send your bitcoin to a new address

New address, `bc1q…` **Quantum secure**

1. In your wallet, make a new receive address (it should start with `bc1q…`).

2. Send all your bitcoin to it.

3. Spend as usual. Your wallet sends the change to a new address, which is quantum secure again.

4. Use a new address for every receive.

Measured on our own full node at block 970,461, 8 October 2026: all 165,030,154 unspent outputs, checked against all 3.52 billion spends since 2009. Public keys that leak off chain cannot be seen in this data.
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