Privacy
The rules and the leak meter
Standard sizes, random starts, rests and a leak meter on every send keep the one public hop from pointing back at you.
Rules that keep wallets apart
| Rule | Value | Why |
|---|---|---|
| A new key per wallet | m/44'/coin'/6874'/venue'/index', every level hardened | No two wallets share an address or a key |
| One wallet per position | the wallet that holds the market, else a never-used ready one, else a new funding | Positions never share a wallet |
| Standard sizes only | 0.01, 0.02, 0.05, 0.1, 0.2, 0.5 or 1 ZEC | The funding hop looks like many others |
| A random start | 20 s to 3 min after you ask | The hop is not timed to your tap |
| Keep-ready refills | the first, when you switch it on: like one you asked for; every one after: exponential, 90 min on average, at most 12 h | A new wallet never shows up right after your trade |
| Due while closed | a new random start when the app opens | The hop is not timed to the app opening |
| Rest after a public arrival | 2–6 h, picked per note | An arrival can't be matched to your next trade |
| Fresh addresses | a fresh shielded refund address for every funding, a fresh shielded payout address for every trip home | Swaps share no Zcash address |
| No memos | never, on any send; the outgoing viewing key is discarded | Nothing marks or reveals the payment |
| Quiet after a send | no sync for a random 1–10 min | A broadcast and the same wallet's reads never share a window |
| No builder code | on any order, on any venue | Orders don't name Umbra Trade |
The leak meter
umbra-trade.vercel.app
Every send runs through it (packages/engine/src/leak.ts).
| Send | Red | Amber | Effect |
|---|---|---|---|
| Funding a private wallet | not a standard size, or it would spend more than is ready (resting ZEC doesn't count) | — | Red blocks the funding |
| Withdrawal to a shielded address | — | — | Always clear: the amount and both addresses stay private |
| Withdrawal to a public address | exactly the amount that came home in the last 48 h | within 2% of it; within 2 h of a payout; not a standard size | Advisory: sending to your own exchange is your choice |
Sapling addresses (zs1…) are refused as a destination; Umbra Trade asks for a unified address.