The client stored BTC in a MultiBit wallet back in 2013 but forgot the password, leaving the assets dormant for 12 years (admittedly resulting in an accidental HODL).
The case took about a year from intake to success. imBack's team tried many approaches and poured in significant compute, finally breaking through after upgrading the password derivation engine.
We just upgraded the password derivation engine a few days ago and tried it on some old cases — sure enough, we got results. Continuous learning and iteration really matters. — imBack Team
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