New Zealand's auction house Webb's has reportedly advised winning bidders to smash artworks so that their digital copies made in the form of the NFTs could be more valuable. As per Digital Camera World, the auction house suggested clients

Photos: Webb's
Photos: Webb's

smash historic glass plate negatives with a small brass hammer.

The glass portraits were taken by New Zealand artist Charles Goldie between 1910 and 1920. Both lots included not only the original glass plate portraits themselves, but also the digitized version in NFTs and the hammer.

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The auction house said the NFTs were been minted on Polygon, a sidechain for the Ethereum blockchain. Webb's emphasized that Polygon uses a different validation system which is vastly "more energy efficient and consequently has a much smaller ecological footprint." It remains unclear though if the winning bidders have followed the advice.