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Charles Hoskinson has intensified the debate around Bitcoin’s post-quantum strategy after questioning the choice of SPHINCS+ as a long-term defense against potential quantum computing threats. The Cardano founder argued that the decision reflects a conservative engineering mindset that may limit future adaptability as the crypto sector weighs how to prepare blockchain systems for theoretical quantum risks without harming efficiency or usability.
“Lol, let's use the least expressive and interesting PQS to solve the quantum issue. Never change Bitcoin” — Charles Hoskinson (@IOHK_Charles), April 21, 2026
SPHINCS+ is a hash-based signature scheme intended to resist quantum attacks. Hoskinson said that while it is considered highly secure, it is not sufficiently expressive for broader blockchain use cases. He argued that Bitcoin is prioritizing a narrow security model over extensibility, which could constrain capabilities such as advanced scripting and composability. In his view, SPHINCS+ addresses a specific cryptographic problem but does not expand the protocol’s functional design space.
Bitcoin developers, however, maintain a different position. They argue that simplicity is a core security feature and that avoiding complex mathematical structures reduces systemic risk. In that framing, SPHINCS+ is attractive because it relies on well-understood hash functions rather than newer or more experimental cryptographic assumptions. The article notes that this conservative design philosophy has historically influenced Bitcoin’s reliability and resilience.
A central concern raised in the debate is SPHINCS+ signature size. The article states that SPHINCS+ signatures are significantly larger than current schemes such as ECDSA or Schnorr, which could increase transaction data size and create long-term scalability pressure. Hoskinson also suggested that locking in a rigid post-quantum standard now could reduce flexibility if more efficient alternatives emerge later.
At the same time, the article says Bitcoin’s current cryptography remains secure against known quantum computing capabilities because such machines do not yet exist at the required scale. It adds that post-quantum research continues across the industry.
While the technical debate continues, Bitcoin is described as trading in a stabilization phase near the upper $70,000 range, reflecting consolidation as regulatory and technological discussions evolve.
Overall, the disagreement is presented as a clash between two approaches: one prioritizing maximum security with minimal complexity, and the other emphasizing adaptability and long-term extensibility as technology changes.
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