{"schema_version":1,"source":"Yieldo","canonical_url":"https://yieldo.me/security#security-cases","name":"Yieldo Verified Crypto Incident Case Studies","unit":"USD","updated_at":"2026-10-20","count":4,"filters":[],"cases":[{"id":"yieldo:security:bybit-2025","slug":"bybit-2025","name":"Bybit","url":"https://yieldo.me/security/bybit-2025","occurred_on":"2025-02-21","amount_usd":1460000000,"amount_is_approximate":true,"valuation_basis":"Bybit’s historical estimate was approximately $1.46 billion. The FBI rounded the amount to $1.5 billion.","chains":["Ethereum"],"target":"Centralized exchange","mechanism":"Frontend and infrastructure","aliases":["Bybit Ethereum cold-wallet hack","Safe{Wallet} Bybit incident"],"outcome":"Bybit replenished client-asset backing through loans, deposits and ETH purchases. The exchange reported $42.89 million frozen as of 23 February 2025.","outcomes":[{"type":"frozen","amount_usd":42890000,"as_of":"2025-02-23","source_id":"bybit-timeline"},{"type":"reserve_replenishment","amount_usd":1230000000,"amount_is_approximate":true,"as_of":"2025-02-24","source_id":"bybit-timeline"}],"sources":[{"title":"Bybit Security Incident: Timeline of Events and FAQs","url":"https://www.bybit.com/en/learn/this-week-in-bybit/bybit-security-incident-timeline"},{"title":"Bybit Confirms Security Integrity Amid Safe{Wallet} Incident","url":"https://www.bybit.com/en/press/post/bybit-confirms-security-integrity-amid-safe-wallet-incident-no-compromise-in-infrastructure-blt9986889e919da8d2"},{"title":"North Korea Responsible for $1.5 Billion Bybit Hack","url":"https://www.fbi.gov/investigate/cyber/alerts/2025/north-korea-responsible-for-1-5-billion-bybit-hack"}],"verified_on":"2026-10-20"},{"id":"yieldo:security:poly-network-2021","slug":"poly-network-2021","name":"Poly Network","url":"https://yieldo.me/security/poly-network-2021","occurred_on":"2021-08-10","amount_usd":610000000,"amount_is_approximate":true,"valuation_basis":"More than $610 million, based on Poly Network’s historical estimate in its incident review.","chains":["Ethereum","BNB Smart Chain","Polygon"],"target":"DeFi protocol","mechanism":"Access control flaw","aliases":["Poly Network bridge exploit"],"outcome":"On 23 August 2021, Poly Network received the remaining wallet key and began restoring users’ control over their assets. Frozen USDT followed a separate release process.","outcomes":[{"type":"control_restored","amount_usd":null,"as_of":"2021-08-23","source_id":"poly-restoration"},{"type":"frozen_usdt_pending_release","amount_usd":33000000,"as_of":"2021-08-23","source_id":"poly-restoration"}],"sources":[{"title":"Honour, Exploit, and Code: How we lost 610M dollar and got it back","url":"https://medium.com/poly-network/honour-exploit-and-code-how-we-lost-610m-dollar-and-got-it-back-c4a7d0606267"},{"title":"Poly Network Commences Full Asset Restoration","url":"https://medium.com/poly-network/poly-network-commences-full-asset-restoration-7f5c548423b9"}],"verified_on":"2026-10-20"},{"id":"yieldo:security:binance-bridge-2022","slug":"binance-bridge-2022","name":"BSC Token Hub","url":"https://yieldo.me/security/binance-bridge-2022","occurred_on":"2022-10-06","amount_usd":566000000,"amount_is_approximate":true,"valuation_basis":"Nansen’s historical estimate of approximately $566 million for 2,000,000 BNB issued without backing.","chains":["BNB Smart Chain","BNB Beacon Chain"],"target":"DeFi protocol","mechanism":"Protocol logic flaw","aliases":["Binance Bridge","BNB Chain bridge hack"],"outcome":"Validators halted BNB Smart Chain to limit further transfers. Subsequently, 1.02 million of the newly issued BNB were locked and burned.","outcomes":[{"type":"locked_and_burned","asset":"BNB","amount":1020000,"as_of":"2023-01-17","source_id":"bnb-burn"}],"sources":[{"title":"BNB Chain Ecosystem Update","url":"https://www.bnbchain.org/en/blog/bnb-chain-ecosystem-update"},{"title":"BNB Chain’s Cross-Chain Bridge Exploit Explained","url":"https://nansen.ai/post/bnb-chains-cross-chain-bridge-exploit-explained"},{"title":"22nd BNB Burn","url":"https://www.bnbchain.org/en/blog/22nd-bnb-burn"}],"verified_on":"2026-10-20"},{"id":"yieldo:security:portal-2022","slug":"portal-2022","name":"Wormhole / Portal","url":"https://yieldo.me/security/portal-2022","occurred_on":"2022-02-02","amount_usd":326000000,"amount_is_approximate":true,"valuation_basis":"SharkTeam’s historical estimate was approximately $326 million for 120,000 unbacked wrapped ETH. Chainalysis valued the amount at over $320 million.","chains":["Solana","Ethereum"],"target":"DeFi protocol","mechanism":"Input validation","aliases":["Wormhole","Portal","Wormhole token bridge"],"outcome":"Jump replenished the bridge’s ETH backing, restoring collateral for the issued tokens. The stolen assets were tracked separately.","outcomes":[{"type":"reserve_replenishment","asset":"ETH","amount":120000,"as_of":"2022-02-03","source_id":"wormhole-chainalysis"}],"sources":[{"title":"Lessons from the Wormhole Exploit","url":"https://www.chainalysis.com/blog/wormhole-hack-february-2022/"},{"title":"Wormhole attack technical analysis","url":"https://www.sharkteam.org/report/analysis/20220203001A_en.pdf"},{"title":"Wormhole Launches New Algorand Portal","url":"https://www.prnewswire.com/news-releases/wormhole-launches-new-algorand-portal-301549108.html"}],"verified_on":"2026-10-20"}]}