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Bitcoin News & Updates / Anomaly on Bitcoin Sidechain Results in Brief Security Lapse
« on: June 26, 2020, 06:40:44 PM »Anomaly on Bitcoin Sidechain Results in Brief Security Lapse
A malfunction in Blockstream’s Liquid bridge for Bitcoin (BTC) resulted in a Blockstream-owned 2-of-3 multisig contract briefly controlling over 870 BTC, worth $8 million.
This was discovered on June 26 by James Prestwich, founder of blockchain software development company Summa, which contributed to the tBTC project.
According to his findings, the spending script for the transaction was configured so as to transfer control to a simple 2-of-3 multisig contract after 2,015 blocks, or about two weeks. While this is intended behavior, this is only meant to be triggered as a last resort if the Liquid network were to collapse, as explained by its documentation.
Prestwich found the issue just as the waiting period expired, which created a window of about thirty minutes, or three Bitcoin blocks, during which the emergency multisig could have taken control of the money.
This did not result in a loss of funds as the emergency multisig is held by Blockstream. The BTC was then moved into a new UTXO that reset the emergency multisig timer.
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