ZuriFi engineering
Blog
Notes on how we design and build financial infrastructure — the decisions, the trade-offs, and the lessons we paid for.
OUSD day 1 support: deposit, withdraw, buy and sell the Open Standard dollar
OUSD went live today — the new dollar stablecoin from the Open Standard consortium, issued through Bridge with reserves at BlackRock and BNY. From today you can deposit and withdraw OUSD on four networks, buy it with mobile money, and sell it back to local currency on ZuriFi.
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Arc day 1 support: deposit, withdraw and spend USDC across East Africa
Arc went live today, and ZuriFi supports it from day one. Deposit USDC on Arc at the address you already use on every EVM chain, withdraw it back out, or spend it on local rails across East Africa. A short note on what shipped and the one thing about Arc that made it interesting to build.
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No passwords, nothing to phish: passkeys and Turnkey at the custody boundary
There is no password column in our database and no login secret a phishing page can capture. How WebAuthn passkeys, Turnkey sub-organizations, and operation-bound approval tokens turned authentication into cryptography — and why the servers that verify a login couldn't forge one if they tried.
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Gasless transactions: account abstraction on EVM, an energy market on TRON
Our users hold stablecoins, not gas tokens. How a transaction leaves a wallet that has never held a wei of ETH or a fraction of a TRX — sponsored user operations on EVM chains, and rented energy on TRON at a fraction of the burn price.
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How we designed a cross-chain deposit indexer that refuses to lose money
Ethereum, Bitcoin, TRON, and Solana are four different planets. Here's the design that watches all of them with one loop, one money path, and one uncomfortable decision that everything else follows from.
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