Privacy has a scaling problem.

The cryptography that makes it possible is expensive with large proofs, heavy verification, and state that grows forever.

Tachyon is designed to solve this.

Zcash's shielded transactions sit at roughly 3 TPS today. Each one creates a nullifier that full nodes must store permanently. This state only grows over time for validators.

Led by Sean Bowe, Tachyon solves the state issue with oblivious synchronization where a service helps you prove you haven't double-spent while remaining blind to what you're really spending.

It handles computation without learning which nullifiers are yours. Validators no longer need to store the full nullifier history, and Zcash's core privacy guarantee stays intact.

Tachyon also aggregates proofs, batching multiple shielded transactions under a single proof and dropping transaction size from around 10 KB to 200-500 bytes.

A fully private Zcash transaction ends up roughly the same size and speed as one for Bitcoin.

Tachyon's shielded pool is expected to go live at the protocol level by end of 2026.

Privacy was never meant to be slow.

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