Redact

What did you build? Redact, a non-custodial app on Monad that hides your crypto balance from public view. You deposit stablecoins into a private balance, check it whenever you want, and withdraw when you need to spend. It's built on Unlink's privacy layer, live on Monad, which handles the actual zero-knowledge cryptography underneath. The standout feature is duress mode, a second passcode that shows a fake, low balance if you're ever forced to open the app under pressure, with no visible difference on screen between the real mode and the decoy. What problem does it solve? Every balance on a public blockchain is visible to anyone who looks. Once a wallet address gets linked to a real name, anyone can see exactly what someone holds. That's not just a privacy inconvenience, it's a documented physical safety risk, real cases of extortion tied to visible on-chain wealth exist and keep happening. Redact keeps your balance off the public ledger by default. You decide when it's shown, and to whom. What did you learn? That building on new infrastructure means budgeting real time for finding its edges, not just its features. Partway through, we hit a version mismatch between Unlink's published SDK and their live Engine, the deposit endpoint returns a valid response the installed SDK doesn't know how to read. We diagnosed it precisely, reported it upstream with exact reproduction steps, and kept building everything that didn't depend on it, registration, private balance reads, withdrawal, duress mode, all fully working and tested. We also learned to actually click through every feature in a real browser before trusting it, more than once something reported as "done" turned out to only be correct in the code, not in what actually rendered on screen.