Bitcoin closed the third quarter at $83,784.92, up 40% over the period, while crypto security losses climbed to $1.26 billion across 247 incidents, according to CoinDesk’s Oct. 1 Daybook newsletter and data tracked by security firm CertiK.
The contrast defined the quarter. Capital kept moving into exchange-traded funds tied to BTC and other tokens, several altcoins outperformed even bitcoin, and some analysts said a new bull run had arrived. At the same time, hacks and exploits kept hitting the sector, adding another round of reputational damage even as prices rose.
Q3 gains in bitcoin came alongside a rise in security losses
CoinDesk said bitcoin outpaced every major asset in the third quarter even as Treasury yields rose to their highest levels in more than two decades. Investors poured billions of dollars into ETFs linked to BTC and other digital assets. Several altcoins rallied even harder.
Yet the industry’s long-running security problem did not ease. CertiK’s figures showed 247 security incidents in Q3, with total losses of $1.26 billion. Losses for the year so far reached $2.68 billion.
September was the worst month of 2026 on both measures. The month saw 99 incidents, the highest count since February 2025, and $768.5 million stolen, the largest monthly total this year.
Sondergaard said those losses still barely register against the capital entering the market through ETFs. He added that most institutions are gaining crypto exposure through regulated, familiar wrappers and are staying away from DeFi protocols.
CertiK says the data shows the problem remains deeply rooted
CoinDesk said the latest numbers point to a security issue that remains entrenched. CertiK wrote on X: 「September was a stark reminder of how quickly the threat landscape can shift. With both losses and incident count reaching their highest levels of 2026, the month's data reinforces the need for security across every layer.」
The message from the quarter was straightforward: market strength has returned, but so have attackers looking to exploit weak points across the ecosystem.
Insurance capacity remains small relative to the risks
The report also highlighted the limited size of crypto’s insurance backstop. CoinGecko’s State of Crypto Security Report 2026, released at the end of August, estimated on-chain crypto insurance coverage capacity at $130.2 million. That was down 20.2% from $163 million last year.
CoinDesk noted that the insurance sector as a whole has struggled to keep pace with the scale of risk, echoing a point the publication had made earlier this year.
AI agents are emerging as a new attack surface
Artificial intelligence added another risk factor to the picture. Security firm Blockaid said it expects multiple incidents involving AI agents, with prompt injection seen as the most likely attack route. In that setup, hidden instructions can trick an AI agent into acting against the interests of its user.
What else was on CoinDesk’s radar
The Daybook newsletter also listed several market and policy items drawing attention on Oct. 1:
- MetaMask security incident forces Ethereum staking exits, no funds at risk (CoinDesk): MetaMask is taking Ethereum staking systems out of service after a security incident. Lido warned of lost rewards, and a security researcher said block production payments were diverted to another wallet.
- 10-year Treasury yield hits highest level since 2002 as global bond rout gathers pace (CNBC): U.S. Treasury yields rose to their highest levels in more than two decades on Thursday. The 30-year Treasury bond yield climbed 3 basis points to 5.6702%, the highest since July 2002, while the 2-year yield rose 2 basis points to 4.91%.
- EU questions Binance over continued operations despite wind-down order (Financial Times): EU officials are questioning Binance over its use of a legal exemption to keep serving customers in the region despite an order to wind down business in the bloc.
- Citigroup raises 12-month bitcoin target to $113,000 as ETF inflows resume (CoinDesk): Citi forecast $5 billion of inflows into products such as ETFs over the next 12 months as advisers and brokerages gradually increase bitcoin allocations.
ETH/BTC chart points to a possible bearish reversal
CoinDesk said the chart in the newsletter showed daily moves in the Binance-listed ether-bitcoin ratio in candlestick format.
After a steep climb in July and August, the uptrend in ETH/BTC has stalled. Repeated failures to hold momentum above 0.033, followed by sideways trading, broke the bullish trendline.
That puts the Ichimoku cloud in focus. A decisive break below the cloud would confirm a bearish trend reversal and point to a renewed downtrend for ether against bitcoin.
Other popular stories listed on the page
- Synthetic tokenized stocks are bad for American investors
- Bitcoin kicks off new quarter in the old $82,000-$85,000 price range
- Citigroup raises 12-month bitcoin target to $113,000 as ETF inflows resume
- MetaMask security incident forces Ethereum staking exits, no funds at risk
- Dogecoin gets DeFi testnet as DogeOS bets miners will eventually secure its apps
- Bitcoin's soft-inflation pop to $85,500 fades as bond yields refuse to fall
- Crypto industry gave $8 million to Clarity Act lobbyists who didn't close the deal
- Open USD takes on Tether, Circle with a different stablecoin model that's 'building money'
- U.S. CFTC seeks event contract definitions that may defy states' gambling claims
- Crypto Long & Short: What will the AI agents run on?
Stablecoin report teaser on the same page
The page also carried a teaser for CoinDesk’s report, The Definitive Stablecoin Landscape Series: Asia Pacific. The description said APAC is becoming a key proving ground as stablecoins move into regulated finance, and that the report maps regional rules, use cases, and RLUSD’s role.