Security.

Counterparty risk occurs when a centralized exchange or custodian commingles customer deposits, lends assets to undercollateralized borrowers, or speculates with proprietary capital. When market liquidations occur or depositors initiate bank runs, fractional-reserve custodians cannot fulfill redemption demands, leading to bankruptcy freezes.

The foundation of cold storage requires never entering your 12-to-24 word BIP-39 recovery seed on any internet-connected computer, phone, or cloud backup. Physical seed phrases must be etched in fireproof stainless steel, verified directly on the hardware screen during transactions, and segregated using passphrase extensions.

Independent audit firms (such as OpenZeppelin, CertiK, and Trail of Bits) inspect code for reentrancy bugs, integer overflows, privilege escalations, and logic flaws. However, an audit is not an insurance policy; audits cannot guarantee security against zero-day economic attack vectors, flash-loan price manipulation, or administrative key compromises.

When traders maintain high leverage on perpetual contracts, small price retracements push position equity below mandatory maintenance margin levels. Automated risk engines forcibly execute market sell orders to protect exchange capital, triggering a chain reaction that exhausts order book depth and causes flash crashes.

Centralized stablecoin issuers (like Tether and Circle) possess programmatic contract capabilities to freeze USDT and USDC addresses identified on OFAC sanction lists. Non-custodial base assets like native Bitcoin and Ethereum cannot be frozen at the protocol consensus layer, but blacklisted addresses face rejection at compliant exchange on-ramps.

Cross-chain bridges lock collateral assets on one blockchain to mint wrapped synthetic representations on another. Because bridge smart contracts hold massive multi-hundred-million-dollar liquidity honeypots and rely on complex multi-signature validator relays, cryptographic vulnerabilities or validator key compromises have historically led to multi-billion-dollar exploits.