Blockchain R&D lab focused on vertically-integrated blockchain privacy.
Joined August 2019
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In order to grow our consulting practice, we starting to offer free 30 mins consulting sessions to our network.
If you have any questions regarding full-stack blockchain privacy, sign up here:
calendly.com/hashcloak/30min
HashCloak retweeted
@StoffelMPC 0.1.3 has finally been released 🥳
Just in time for the weekend so that you can build MPC apps with ease
The team focused on improving the developer experience in this release
HashCloak retweeted
Shamir secret sharing uses a polynomial to encode a value into shares.
One share reveals nothing useful. A threshold of shares can reconstruct the value.
Read the worked explanation:
stoffelmpc.com/stoffel-blog/…
HashCloak retweeted
Sunspot has been audited! 🎉
It's an end-to-end ZK proving pipeline for privacy-preserving apps on Solana - think ZK identity, KYC, private DeFi, and more.
Define circuits with Noir, prove directly in the browser with SunspotJS, and verify cheaply on Solana.
Have you been wanting to build ZK apps on Solana but can't find a turnkey solution without having to cobble together a ZK proving pipeline that works on Solana?
Our friends @reilabs_io built Sunspot and we did audited it.
Read the case study 👇
hashcloak.com/case-studies/s…
HashCloak retweeted
A product should not need one backend to hold every private detail just to use them in one decision.
Secret sharing splits the information so no single party gets the complete value.
Read the worked explanation:
stoffelmpc.com/stoffel-blog/…
Have you been wanting to build ZK apps on Solana but can't find a turnkey solution without having to cobble together a ZK proving pipeline that works on Solana?
Our friends @reilabs_io built Sunspot and we did audited it.
Read the case study 👇
hashcloak.com/case-studies/s…
HashCloak retweeted
I tracked down the exact bug that drained Payy. Easy to miss in the noise, but particularly scary because of how it happened.
TLDR; the code was correct, yet was drained anyway. Details below...
HashCloak retweeted
Generated bindings make private app values and authorized outputs normal Rust types. Configure coordinator, node, and identity settings once, then use `run_typed_with_manifest(...)` from the client-owned path.
See the deployed client path:
docs.stoffelmpc.com/rust-sdk…
ALT Rust loads a Stoffel bytecode artifact, derives off-chain client IO, sets coordinator, node RPC and identity configuration, then builds StoffelClient.
HashCloak retweeted
Generated bindings make private app values and authorized outputs normal Rust types. Configure coordinator, node, and identity settings once, then use `run_typed_with_manifest(...)` from the client-owned path.
See the deployed client path:
docs.stoffelmpc.com/rust-sdk…
ALT A deadpan character says “I don’t need to detach. I’m already nothing,” paired with private values that never pass through the normal app backend.
HashCloak retweeted
Compile once. Save `.stflb`. Load the same program with new values inside your Rust app.
See the bytecode path:
docs.stoffelmpc.com/rust-sdk…
ALT A crowd queues at the “compile once, load .stflb” window while the “recompile every run” window is empty.
HashCloak retweeted
Read the worked explanation:
stoffelmpc.com/stoffel-blog/…
Shamir secret sharing starts with one useful constraint: no single share should reveal the secret.
The threshold defines which group can reconstruct it.
HashCloak retweeted
Compile once. Save `.stflb`. Load the same program with new values inside your Rust app.
See the bytecode path:
docs.stoffelmpc.com/rust-sdk…
ALT Stoffel Rust SDK bytecode_save_load shown as a code screenshot, with the approved full Stoffel logo.
HashCloak retweeted
Keep ordinary product logic in Rust. A configured `StoffelClient` sends the private step through separately running coordinator/MPC services, then maps typed values back into your app.
See the app-shaped SDK path:
docs.stoffelmpc.com/rust-sdk…
ALT Rust PrivateMetricsService calls run_typed_with_manifest on StoffelClient and maps generated outputs into a MetricsSummary domain type.
HashCloak retweeted
One share is useless. The threshold is the point.
Shamir secret sharing does not chop a secret into recognizable pieces. Fewer than t shares reveal nothing useful; t shares reconstruct.
Walk through the math:
stoffelmpc.com/stoffel-blog/…
HashCloak retweeted
MPC starts with a better question:
Does one backend actually need to see everyone’s private data to run this computation?
Usually, the useful thing is the computation, not centralizing everything first.
Start with the model:
stoffelmpc.com/stoffel-blog/…
HashCloak retweeted
Nadim gave workshop on Verifpal for @hashcloak on Friday and by Sunday, man's shipped an example with threshold signing 🤯
Verifpal can now model threshold protocols, such as FROST threshold signing!
Here's Verifpal finding a 3-out-of-5 threshold signature forgery: symbolic.software/blog/2026-…
HashCloak retweeted
Keep ordinary product logic in Rust. A configured `StoffelClient` sends the private step through separately running coordinator/MPC services, then maps typed values back into your app.
See the app-shaped SDK path:
docs.stoffelmpc.com/rust-sdk…
ALT Will Smith presents the Stoffel mascot, paired with a normal Rust service using one typed Stoffel client call for its private computation step.
HashCloak retweeted
Verifpal can now model threshold protocols, such as FROST threshold signing!
Here's Verifpal finding a 3-out-of-5 threshold signature forgery: symbolic.software/blog/2026-…
HashCloak retweeted
One share is useless. The threshold is the point.
Shamir secret sharing does not chop a secret into recognizable pieces. Fewer than t shares reveal nothing useful; t shares reconstruct.
Walk through the math:
stoffelmpc.com/stoffel-blog/…
HashCloak retweeted
💡Reminder to all to update your wallet.
⚠️Block 1,371,000 is approaching (estimated September 4, 2026 at 10:00 UTC.)
✅ Full Spark functionality will be restored and the network will be stronger and more resilient than ever. Make sure you're updated before the block hits.
📱The Campfire mobile wallet is also being updated - stay tuned for the new update
firo.org/2026/08/27/firo-v01…
Firo v0.14.18.0 Release - Full Spark functionality is being Restored! 🎉
🛠 A hard fork activates at block 1,371,000 (~September 4, 2026 at 10:00 UTC). Everyone needs to update their wallet before then - users, miners, exchanges, and node operators.
✅ This release includes extensive security hardening across transaction validation, proof verification, and network stability - making #Firo more robust than it has ever been. $FIRO
Details here: firo.org/2026/08/27/firo-v01…
HashCloak retweeted
MPC starts with a better question:
Does one backend actually need to see everyone’s private data to run this computation?
Usually, the useful thing is the computation, not centralizing everything first.
Start with the model:
stoffelmpc.com/stoffel-blog/…