1. In 2018 he used the Ledger Chrome app to create a BTC and a LTC address to receive funds.
2. They sent him the funds, both LTC and BTC, blockchain explorers confirm that the funds are received and confirnmed.
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Something's not adding up here.
You stated that both addresses were generated by the Ledger app in 2018, but, according to this
transaction, the Bitcoin address received the funds on Dec 29, 2017 and that is the only transaction to that address. How is that possible?