23% — Quantum breaks Bitcoin by ___
Leader: December 31, 2027 at 23% · Polymarket 23% · 2 contracts · $29 volume · low confidence
Updated 2026-05-09 07:21:14 UTC

Tracks the leading outcome in a winner-take-all prediction market set with 2 outcomes.

Why this matters:
This 19% probability estimates the odds that quantum computing developments will compromise Bitcoin's security by some point in 2026. The estimate reflects assessments of both near-term quantum advancement timelines and Bitcoin's cryptographic vulnerabilities. The probability would rise if major quantum computing breakthroughs occur, particularly achievements in error correction or qubit count that bring practical cryptanalysis closer to feasibility. It would fall if quantum progress stalls relative to current expectations or if Bitcoin implements post-quantum cryptography upgrades preemptively. Key catalysts include major announcements from quantum computing firms, research publications demonstrating advances in relevant attack methods, and any significant Bitcoin protocol updates addressing quantum risks. Current market pricing suggests participants view large-scale quantum threats as possible but not imminent within this timeframe.

Key factors:
- Current quantum computers lack sufficient qubits and error correction to threaten Bitcoin's ECDSA encryption, with estimates suggesting 1-2 million logical qubits would be required for a cryptographically relevant attack
- Bitcoin's development roadmap includes no scheduled post-quantum cryptography migration by end-2026, leaving protocol changes as a major uncertainty factor
- Major quantum hardware companies have not announced near-term milestones suggesting cryptographically relevant quantum computing within six months
- The timeline assumption matters: quantum breakthroughs that threaten Bitcoin could occur years away, making 2026 a narrow resolution window for this specific question
- Market concentration is low across these contracts, with top volumes under $54k daily, suggesting limited institutional conviction around the exact probability level

Contracts:
- Quantum breaks Bitcoin by ___?: December 31, 2027 — 23¢ Polymarket $7 (weight 24%)
- Quantum breaks Bitcoin by ___?: December 31, 2026 — 5¢ Polymarket $22 (weight 76%)

Cite as: "23% per prediction markets (SimpleFunctions, May 2026)"
Canonical: https://simplefunctions.dev/answer/quantum-breaks-bitcoin
Full data: https://simplefunctions.dev/api/public/query?q=Quantum%20breaks%20Bitcoin%20by%20___
Provider: SimpleFunctions — https://simplefunctions.dev