fxUSD Observer
Independent tracker for the f(x) ecosystem
Privacy Initiativesf(x) Protocol · Privacy-preserving DeFi

f(x) Protocol is building privacy-first DeFi tools on Ethereum. The initiatives below let fxUSD participants shield their on-chain footprint using zero-knowledge proofs — without giving up self-custody or regulatory compliance.

RAILGUN Airdrop

Airdrop
fxUSD × RAILGUN
Open app

Claim your RAIL token airdrop as an fxUSD ecosystem participant. RAILGUN is a smart-contract privacy system built directly on-chain, using zk-SNARKs to shield token balances and transactions without intermediaries.

·Eligible addresses: fxUSD holders and f(x) Protocol users
·Powered by RAILGUN on-chain zk-SNARK shielding
·No custody — your keys, your tokens
https://fx.aladdin.club/v2/railgun-airdrop

Privacy Pool

DeFi
fxUSD × Privacy Pool
Open app

Deposit fxUSD into a privacy-preserving pool that lets you prove membership in a compliant set of users — without revealing which specific address you are. Based on the Privacy Pools protocol proposed by Vitalik Buterin et al.

·Selective disclosure via association-set proofs
·Compliant privacy: prove you are not from a sanctioned set
·Leverages Ethereum's programmable cryptography
https://fx.aladdin.club/v2/privacy-pool
About on-chain privacy

Zero-knowledge proofs allow a user to demonstrate knowledge of a secret (e.g., I deposited funds into this pool) without revealing which specific transaction or address is theirs. RAILGUN uses zk-SNARKs to shield balances natively on Ethereum. Privacy Pool uses association sets — cryptographic proofs of membership in a compliant group — so users can selectively disclose compliance without deanonymising their full transaction history.