Cryptography is only as strong as the computers that try to break it.
For decades, digital signatures have relied on mathematical assumptions — like the difficulty of factoring large primes or solving elliptic curves. But quantum computing threatens all of that. What seemed unbreakable yesterday could be trivial tomorrow.
That’s why Xcoin doesn’t rely on assumptions. It uses hash-based cryptography, a method so simple and proven that even quantum computers can’t crack it.
At the core of this defense are two powerful signature systems: WOTS+ and SPHINCS+.
WOTS+ (Winternitz One-Time Signature Plus) is as minimal as cryptography gets. It’s designed for one job: signing a single message with total security. Once used, it’s discarded — leaving no room for reuse, exploitation, or retroactive attacks.
It may sound inefficient, but WOTS+ is lightning-fast and lightweight. It uses only hash functions — no elliptic curves, no complex math, just pure irreversible computation. That simplicity is its strength.
But how do you scale something that’s designed to work only once?
That’s where SPHINCS+ comes in.
SPHINCS+ takes the one-time safety of WOTS+ and layers it into a structure that can support millions of signatures — without compromising security. It builds a Merkle tree of one-time keys, and signs with a new path through that tree every time.
This means users don’t have to store secret counters or state between sessions — and the system remains secure even if devices go offline or are reset.
Together, SPHINCS+ and WOTS+ provide Xcoin with a stateless, quantum-safe signature mechanism that requires no special hardware, no exotic assumptions, and no dependencies on soon-to-be-obsolete math.
SPHINCS+ isn’t just a research project. It’s one of the first post-quantum signature algorithms officially selected by NIST (the U.S. National Institute of Standards and Technology) as a new global standard.
That means it’s been audited, challenged, and reviewed by the world’s top cryptographers. And it passed.
Xcoin integrates this technology directly into its protocol — not as an add-on or experiment, but as the foundation for every signature the network produces.
Because when the cryptographic foundations of the internet collapse — and they will — very few systems will be ready.
Xcoin is one of them.
SPHINCS+ and WOTS+ don’t just prepare Xcoin for a post-quantum future — they guarantee it. The signatures protecting your funds can’t be forged. They can’t be faked. And they won’t be broken — not now, not in 10 years, not even by quantum machines with nation-state budgets.
In a digital world increasingly shaped by surveillance, computation, and competition, Xcoin chooses the one form of security that cannot be negotiated: provable, irreversible, and future-proof.