By Elizabeth Howcroft LONDON (Reuters) - Sales of non-fungible tokens dropped sharply in the third quarter, according to blockchain tracker DappRadar, as crypto investors hunker down for a "crypto winter" and demand for the highly speculative digital assets shows little sign of returning. Non-fungible tokens (NFTs) are a kind of blockchain-based asset representing a digital file such as an image, video or item in an online game. The third quarter of 2022 saw $3.4 billion in NFT sales, down from $8.4 billion the previous quarter and $12.5 billion at the market's peak in the first quarter of the year, DappRadar said. "The previous crypto winters were a little more isolated to just crypto prices so for that reason, I think it's wise to be conservative about how long this could last." Source: Reuters