Private financial infrastructure for the on-chain economy.. Encrypted custody with threshold-authorised disclosure.
Joined November 2025
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Sunima bridge now works both ways.
In: lock btUSD on Arbitrum, validators attest, Sunima verifies a proof and mints.
Out: burn on Sunima, 5 of 7 validators sign the exit. No single key.
First withdrawal hit Arbitrum in ~1 min.
Try it: sunima.uk/testnet/bridge.htm…
Why no one holds the key on Sunima 🧵 1/ Think of a bank vault that needs 5 of 7 managers to turn their keys at the same time. Lose one manager — the vault still opens. Bribe one — nothing happens.
None of them ever sees the whole key. Neither do we. If someone tries to cheat with a bad piece, the chain sees exactly who it was.
How safe is our bridge? An honest scorecard 🧵
Most big bridge hacks (Ronin $600M, Harmony $100M) had one thing in common: an attacker collected enough signing keys.
Here is what we do about that, and what we haven't done yet.
- No unproven exits. This morning the chain itself refused our own test withdrawal until the deposits behind it were proven. Annoying, and exactly right.
Not yet:
- Key holders outside our team
- Ethereum light client for final proofs
- External audit
- ZK proof on exit
Testnet first, no real value at risk. We'll post each step as it lands.
sunima.uk/testnet/bridge.htm…
Sunima quests are now on Zealy 🌉
Same on-chain actions, now with Zealy XP: faucet, transfers, staking, governance, private transfers, EVM and the Arbitrum bridge.
Connect once with Keplr (one signature, no fee) — every quest is checked on chain.
zealy.io/cw/sunimaprivacygui…
Upgrade day on Sunima testnet 🧵 1/ Yesterday we pushed v19. Validators voted it in, every node switched at the same block, and the chain kept going.
Lesson: upgrades aren't just code. They're 11 people on different servers doing the right thing at the same minute. We're writing a clearer checklist for operators.
Why we started building Sunima 🧵 1/ Most chains make you choose: everything public, or a privacy coin that exchanges are scared to list. We didn't like either option.
So Sunima keeps transfers private by default. A court order can open one specific case — and only if most validators agree, not one person with a master key.
Someone just finished every testnet quest we have — and got the 🏆 Quest Master role in our Discord. Bridge, staking, governance votes, a private transfer, the lot. Next one could be you: sunima.uk/testnet/quests.htm…