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Structural failure

Absence Of Withdrawal Monitoring

No automated alert when bridge or treasury balances move at uncharacteristic size or speed. Six days of silence is typical.

Records exhibiting this pattern

Exchange collapse·February 24, 2014ongoing
Mt. Gox Collapse — February 2014
The exchange handling 70 percent of global Bitcoin trading suspended withdrawals, filed for bankruptcy, and disclosed the loss of 850,000 BTC — a recovery that is still being distributed to creditors a decade later.
$450.0M affected