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Mystery 20 bitcoin burned after exchange round trip from 12-year dormant wallet

On-chain data shows about $1 million worth of bitcoin moved from a wallet dormant for about 12 years, passed through a major centralised exchange and returned to the original wallet before being burned. The wallet transferred 20.00010537 BTC in March and received 20.00006037 BTC back three weeks later, a difference of 4,500 satoshis, about $3 at the time. The transfer was part of 107 BTC burned in May, worth about $8.5 million.