More than 6,427 BTC that had remained dormant for years changed hands in August, with the coins valued at about $507m, according to the latest blockchain data.
The surge followed the Coldcard exploit in July, which resulted in losses eventually estimated at about 2,000 BTC. The incident appears to have unsettled some long-term Bitcoin holders, although no direct connection has been established between the exploit and the subsequent movements.
Two hardware-wallet manufacturers, Safepal and Trezor, also disclosed data breaches during the past month. The breaches exposed customer information including names, email addresses, phone numbers and shipping addresses.
The movement of so-called “sleeping” Bitcoin may indicate that some early adopters are taking a more cautious approach to the storage of their holdings and reviewing how their assets are organised.
Activity accelerated sharply in August. Dormant Bitcoin movements had already passed July’s total within the first 10 days of the month. Across July, 30 transactions involving wallets created between 2010 and 2017 moved 1,264.16 BTC.
By contrast, the final 30 days of August recorded an average of 214.25 BTC moving each day, compared with 40.78 BTC per day in July. That represents an increase of 5.3 times.
Btcparser.com identified 188 separate transactions involving the 6,427.59 BTC transferred in August. Eight of those movements came from wallets first created in 2010 or 2011. Two transfers associated with 2010 wallets involved 50 BTC, while six transactions linked to 2011 wallets moved a combined 155.57 BTC.
Most of the activity came from wallets established between 2012 and 2017. Addresses created in 2014 accounted for the largest share, with 94 transactions moving about 3,286.26 BTC between 1 August and 30 August.
Wallets created in 2016 ranked second, with 29 movements totalling 985.38 BTC. The 2013 group was third, recording 16 transactions involving 845.48 BTC.
Addresses dating from 2012 moved 233.41 BTC, while wallets created in 2015 transferred about 415 BTC. The 2017 group recorded 26 movements involving 456.47 BTC.
The 2014 activity was not a single, continuous wave. Instead, it appeared in two separate clusters with notably different patterns.
One group consisted of 64 addresses created between 27 January and 4 February 2014. Together, they moved 1,672 BTC across 11 days between 3 August and 13 August, with some later individual transactions following. The transfers ranged in size from 0.31 BTC to 33 BTC.
The second cluster involved 25 addresses created between 30 November and 26 December 2014. They moved 1,514 BTC in almost identical batches of about 50 BTC. Twenty-two of the 25 addresses were swept on 19 August within a period of roughly one hour.
Such coordination makes it unlikely that many unrelated holders independently decided to move decade-old Bitcoin on the same afternoon. Instead, the pattern may point to one custodian or key holder carrying out a scripted batch transfer.
The wallets appear to have been funded at around the same time in late 2014. Possible explanations include a change to an exchange’s cold-storage arrangements, the release of funds held in escrow or the distribution of a large number of paper wallets.
The blockchain data does not establish why the movements took place. However, the activity could reflect growing concern over the risks associated with ageing keys, with larger holders potentially consolidating legacy Bitcoin rather than treating it as a long-term digital keepsake.
The underlying motivations remain unknown, leaving the address movements themselves as the main evidence available.
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