Archive - Defendor

Halted By Design

One missing case. Every validator stopped.

Jun 1 • Arsen

May 2026

The Deferred Check

It was found in p-token before mainnet. Here's how.

May 25 • Arsen

The Free Variable

Four proof fields. No opening proof. Full circuit bypass.

May 18 • Arsen

The Signer You Trust

Your on-chain code is immutable. Your toolchain isn't.

May 11 • Arsen

Vulnerabilities that aren't

The runtime patched them. The curriculum didn't.

May 4 • Arsen

April 2026

150K SUI from Code Nobody Called

The protocol was audited. The old version wasn't.

Apr 27 • Arsen

One Character Off

first → last. Every cooldown, every attribution — silently wrong.

Apr 20 • Arsen

March 2026

Auditor's golden system

Write notes like this. Find more bugs.

Mar 30 • Arsen

Pre-Quoted. Not Safe.

Most people missed this. Here's exactly what was wrong.

Mar 23 • Arsen

Where the Money Went?

Why blind calldata forwarding breaks DeFi vaults

Mar 19 • Arsen

You understand the code. Now what?

That's not the end. That's the starting line.

Mar 16 • Arsen

How to approach contests in 2026

How to approach contests correctly

Mar 2 • Arsen

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