Toward post-quantum cryptography: the next generation of blockchains

The race toward quantum resistance has become a strategic priority for any serious blockchain project. As quantum computers keep progressing (IBM, Google, IonQ, and others), the classical cryptography based on elliptic curves (Ed25519, secp256k1) used by Bitcoin, Ethereum, Solana and many more will theoretically become vulnerable to powerful quantum algorithms (Shor, Grover).

Fortunately, the blockchain ecosystem isn't standing still. Several major projects are already planning or deploying post-quantum upgrades that will allow their networks to remain secure even against adversaries equipped with quantum computers.

Why quantum threatens today's blockchains

The security of cryptocurrencies rests on a fundamental principle: a transaction is only authorized if it is signed by a private key that matches a public key. On classical blockchains, these signatures rely on algorithms like Ed25519 or secp256k1, and both standards are assumed to be hard to break for classical computers.

But a sufficiently powerful quantum computer running Shor's algorithm could, in theory, derive a private key from a public key, making the current public/private key model obsolete. In that future scenario, thousands or even millions of addresses could be compromised.