# Bitcoin's First Quantum-Safe Spend Was Mined Without Any Change to Consensus Rules

The transaction relied on hashes instead of elliptic-curve signatures, cost between $75 and $150 in cloud computing to produce, and leaves roughly 7 million bitcoin in outputs with exposed public keys.

- Published: 2026-08-28T05:39:41.604Z
- Canonical: https://polylog.news/crypto/2026-08-28/bitcoin-s-first-quantum-safe-spend-was-mined-without-any-cha
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [Bitcoin Magazine](https://bitcoinmagazine.com/news/bitcoin-quantum-resistant-transaction), [CryptoSlate](https://cryptoslate.com/bitcoin-now-has-a-quantum-computing-escape-route-but-7-million-btc-may-still-be-exposed/)

A bitcoin transaction spent from an output secured by hashes rather than elliptic-curve cryptography was mined into block 964,199 on August 26. The method, called Quantum Safe Bitcoin, uses signature grinding together with RIPEMD-160 hashin…

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