Wallet draining empties a crypto wallet through approvals or signatures the owner didn't fully understand. This post explains the mechanism, the two main attack paths, what gets drained and what doesn't, and how defenses are evolving.

When a DeFi app asks you to approve 'infinite,' it's granting a smart contract permanent, unlimited permission to move your tokens. Here's how the mechanism works, where the risk actually lives, and what's changing.

When you approve a DeFi protocol to spend your tokens, that permission doesn't expire — it persists until you revoke it. This explains how approvals work, what revoking does, and where the real risk sits.

When a DAO gets hacked, either smart contract code breaks or the governance mechanism itself gets weaponized. The two failure modes work differently, the response options are different, and what happens to funds and users depends entirely on which type you're dealing with.

When a crypto bridge gets exploited, the vault gets drained and bridged assets on the destination chain become unbacked. Here's the mechanism, the historical examples, and what determines who loses what.

A 51% attack gives an attacker majority control over a blockchain's consensus process — but what they can actually do with it is more specific (and more limited) than most descriptions suggest. Here's the mechanism, the historical examples, and why it matters more for some chains than others.

When a smart contract has a bug, the code can't be patched — it's already live on-chain, and funds are already at risk. This post maps the main vulnerability categories, what recovery options actually exist, and how the security ecosystem has developed in response.

When a smart contract has a bug, the code can't be patched — it's already live on-chain, and funds are already at risk. This post maps the main vulnerability categories, what recovery options actually exist, and how the security ecosystem has developed in response.

A pending crypto transaction can sit in the mempool indefinitely when fees are too low or nonces are out of order. Here's the mechanism behind stuck transactions and what actually happens when you wait, speed up, or cancel.

A validator going offline triggers inactivity penalties — not slashing. Here's how Ethereum's proof-of-stake design distinguishes unavailability from misbehavior, and what the inactivity leak actually does.

When the last bitcoin is mined around 2140, the block subsidy disappears — but the network keeps running. Here's what changes mechanically for miners, security, and transactions, and what the open questions are.

Bitcoin's 32nd halving around 2140 ends the block subsidy entirely. After that, transaction fees become miners' only revenue. Here's how the fee market works and what it means for network security.