K33 research head Vetle Lunde said the Coldcard attack likely caused about 890,000 BTC to move within seven days, setting a record for active supply over a seven-day period in 2026. According to Odaily, K33 estimated that about 7,300 addresses had roughly 1,596 BTC stolen when the report was prepared.
The issue stemmed from a firmware flaw in Coldcard hardware wallets introduced by Coinkite in March 2021, which may have generated wallet seeds with insufficient randomness. Since July 30, coordinated transfers have moved about 1,600 BTC from thousands of addresses, and a possible fourth wave of attacks has lifted the total to nearly 2,000 BTC.
On-chain data showed Bitcoin's seven-day hot supply rose from 403,101.95 BTC on July 28 to 797,407.72 BTC on August 4, an increase of about 394,306 BTC, or 98%, in one week. Timechainindex.com’s Sani said exchange net inflows reached 22,052 BTC since the Coldcard hack on Friday.
From July 30 to August 5, 39 dormant addresses transferred 1,486.09044782 BTC, and one address created in 2010 moved 50 BTC. Five addresses created in 2013 transferred a combined 620.00100547 BTC.
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