Pinned post Cyfrin Updraft 馃煩 Verified account @CyfrinUpdraft 路 Jan 19, Jan 19, 2026, 1:16 PM The Solana Development Course has dropped on Updraft.12 programs. Native Rust + Anchor. Security CTFs.Completely free.
Cyfrin Updraft 馃煩 Verified account @CyfrinUpdraft 路 Jun 14, Jun 14, 2026, 4:04 PM The `refund` function in PuppyRaffle sends ETH before updating state.That's textbook reentrancy. Here's exactly how an attacker drains the entire contract. 馃У
Cyfrin Updraft 馃煩 Verified account @CyfrinUpdraft 路 Jun 13, Jun 13, 2026, 3:57 PM Reentrancy has drained hundreds of millions from smart contracts. The original DAO hack. Countless DeFi protocols since.It all comes down to one mistake: making an external call before updating state. 馃У
Cyfrin Updraft 馃煩 Verified account @CyfrinUpdraft 路 Jun 12, Jun 12, 2026, 3:57 PM Most people stake ETH and stop there.But you can stack yield on top of yield by routing through Balancer and Aura Finance.Here's how rETH holders can earn BAL, AURA, and RPL on top of their staking rewards. 馃У
Cyfrin Updraft 馃煩 Verified account @CyfrinUpdraft 路 Jun 11, Jun 11, 2026, 10:58 PM Most Solidity devs have never manually emitted an event using assembly.But gas-optimized contracts do it all the time. Here's how log4 actually works at the EVM level. 馃У