by Coinstrooper Crypto Articles
Quick Take
  • Bitcoin is facing a rare structural debate that goes beyond price cycles and macro liquidity.
  • According to Coinbase, signature compromise is the primary concern, not quantum mining.
  • Satoshi-era coins represent a known subset of this exposure.
  • In addition, every Bitcoin transaction faces short-range risk at the moment of spending, when public keys briefly appear in the mempool.

What Happened

Bitcoin is facing a rare structural debate that goes beyond price cycles and macro liquidity. According to David Duong, Global Head of Investment Research at Coinbase, quantum computing presents two specific pathways that could eventually compromise Bitcoin’s cryptographic security. While the risk is not immediate, Duong warns that investor timelines for quantum readiness are shortening, forcing markets to consider long-dated downside scenarios that were previously ignored.

Satoshi-era coins represent a known subset of this exposure. In addition, every Bitcoin transaction faces short-range risk at the moment of spending, when public keys briefly appear in the mempool. While exploitation probability remains low today, Coinbase argues this risk profile makes post-quantum migration unavoidable.

A gradual transition, allowing upgrades over five to seven years

Potential solutions include quantum-resistant signature schemes such as CRYSTALS-Dilithium and SPHINCS+, likely introduced via soft forks to preserve network continuity.

Market Context

Bitcoin Price Prediction: Triple Top Meets Fibonacci Support as BTC Nears Breakout Point

On the daily chart, Bitcoin price prediction has turned bearish as BTC is consolidating below $94,100, where a triple top pattern has formed. This level aligns with the 50% Fibonacci retracement of the decline from $107,700, reinforcing supply pressure.

Price remains supported by a rising trendline from November, with the 38.2% retracement near $90,900 acting as a key pivot.

Why It Matters

The discussion has already reached institutional levels, with BlackRock flagging quantum risk in a May 2025 amendment to its iShares Bitcoin Trust (IBIT) prospectus.

Duong’s analysis, published by Coinbase, centers on a hypothetical “Q-day” when cryptographically relevant quantum computers (CRQCs) could run Shor’s and Grover’s algorithms efficiently enough to weaken existing encryption standards.

According to Coinbase, signature compromise is the primary concern, not quantum mining. While quantum-accelerated mining faces scaling limits, breaking ECDSA could allow attackers to derive private keys from exposed public keys, enabling unauthorized transfers.

Details

Coinbase Flags Two Quantum Attack Vectors on Bitcoin

Bitcoin relies on two core systems:

ECDSA for transaction signatures

SHA-256 for proof-of-work mining

6.51 Million BTC Already Exposed On-Chain

Coinbase estimates that 6.51 million BTC, or 32.7% of total supply, is currently vulnerable to long-range quantum attacks due to address reuse and legacy script types.

These include:

Pay-to-Public-Key (P2PK)

Bare multisig (P2MS)

Certain Taproot (P2TR) outputs

Governments Target 2035 as Crypto Migration Deadline

US and EU agencies have already instructed critical infrastructure providers to transition to post-quantum cryptography (PQC) by 2035, according to public policy guidance. Bitcoin developers and research groups such as Chaincode Labs are evaluating similar timelines.

Chaincode outlines two possible scenarios:

A rapid quantum breakthrough, forcing migration within two years