The quantum threat to crypto is real.

New research shows breaking the elliptic curve cryptography securing most blockchains could require fewer than 500k physical qubits, nearly a 20x reduction from previous estimates.

@Zcash is one of the few projects already deep into this work.

Zcash's shielded transactions provide strong protection against retroactive de-anonymization through information theoretic hiding, though some components still rely on pre-quantum cryptography. The remaining quantum risks are being addressed in a deliberate sequence.

Post-quantum privacy comes first through the Tachyon upgrade targeting mainnet by end of 2026. Tachyon eliminates in-band secret distribution, closing the door on harvest now, decrypt later attacks.

If a transaction is exposed before the upgrade ships, there's no fixing that after the fact. Tachyon also bundles scaling improvements alongside the quantum work so the network gets faster at the same time it gets safer.

Quantum recoverability is next. This acts as an escape hatch that protects user funds if quantum hardware arrives sooner than expected. The mechanism is already designed with development actively underway.

After Tachyon ships, the architecture won't need to change for post-quantum soundness. Some folding schemes will need to be swapped out, and the team has time to select the best ones.

Zcash just happens to have a head start.

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