How Fuyu works

Your assets sit in a private pool. Proofs made on your device move them. To check compliance, auditors ask yes-or-no questions in Fuyu Policy Language (FPL) and get answers backed by a proof, without seeing the rest of your account.

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Every balance becomes a private note.

A note records an asset, an amount and its owner. The chain only stores a commitment to it, so nobody can read what's inside.

Self-custodial. Always in your control.

Your keys and your data never leave your device. To move funds, it creates a proof the pool can verify without seeing anything else.

Trade anywhere. Stay anonymous.

Swap and earn on Uniswap, Aave and more. The market sees the trade, never who made it.

Fuyu Policy Language

Fuyu Policy Language (FPL) is a compliance query language. Auditors ask Yes/No questions about an account’s history; policies say what each answer may reveal, and to whom.

treasury.fuyu

1policy TreasuryDisclosure {
permit auditor ask holdings expose manifest(CurrentView);
permit auditor ask holdings, provenance, activity,
  identity expose manifest(AuditReview);
5}
6
7query QuarterlyReview for auditor about treasury
  at finalized(24000100) expires 1893456000 {
over_1m: value(USD) >= 1_000_000 USD;
sanctioned_funds:
  exists deposit where source in OFAC@17;
held_sep_30:
  balance(stataUSDC) at 2026-09-30 >= 25_000 stataUSDC;
within_limits:
  every day in 2026-07-01..2026-09-30:
    sum(trade.amount_in in USD) <= 50_000 USD;
verified_entity:
  attested(KycIssuer, verified_entity);
cleared: over_1m and not sanctioned_funds
  and within_limits and verified_entity;
21}

Compliance-friendly auditing.

Auditors and compliance teams ask the questions they need answered. You approve, and they get verified answers without seeing the rest of your account.

AUDITOR ASKSANSWER

Is the balance above $1M?

Yesverified

Any funds from a sanctioned source?

Noverified

Was the position held on Sep 30?

Yesverified

Did trades stay within daily limits?

Yesverified

Is the owner a verified entity?

Yesverified

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Programmable privacy for DeFi from zkSNARKs: the full architecture, threat model and FPL semantics.

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