Bitcoin Activity Surges After Coldcard Hack Drains Over $100M in BTC

Key Point

Bitcoin network activity surged as users moved holdings to exchanges or other wallets after the Coldcard hardware wallet hack. Blockchain.com data showed unconfirmed transactions in the Bitcoin mempool reached 89,031, the highest since February 2025. Active addresses climbed to a three-month high of 712,000. Whale transfers rose to a five-month high of 61,800. More than $100 million worth of BTC was said to have been stolen, and Galaxy Research estimated losses could reach 2,055 BTC.

Why it matters: A large wallet-security incident could pressure user confidence and increase short-term transfer stress across Bitcoin infrastructure.

Market Sentiment

Bearish, Stress-on, Event-driven, Volatile.

Reason: More than $100 million worth of BTC was said to have been stolen, which makes the market read the event as a security-driven stress signal.

Similar Past Cases

After the Ronin Bridge hack, Sky Mavis raised $150 million to reimburse users after roughly $620 million was stolen from Ronin's network bridge. (Axios) The key difference is that Ronin was a bridge and gaming ecosystem incident, while Coldcard involves a hardware wallet breach and Bitcoin wallet movement.

Ripple Effect

Security breach concerns could push more users to rotate wallets, move coins to exchanges, or delay self-custody transfers. If mempool congestion persists, then higher transfer friction could reduce short-term liquidity flexibility.

Opportunities & Risks

Opportunities: If unconfirmed transactions and active addresses fall from elevated levels, then reduced transfer stress can be a potential stabilization signal for BTC holders.

Risks: If Galaxy Research's loss estimate keeps moving toward 2,055 BTC or more user transfers hit exchanges, then reducing leveraged exposure can limit downside from security-driven selling pressure.