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The author introduces their self-made link compressor Hammer, which doesn't rely on a database and can encode full links into short links via compression, making the generated QR codes easier to scan. This is an experimental project achieved through techniques such as removing redundancy, selecting an appropriate alphabet, and Huffman compression.
An analysis of 657,607 links from the 0.mk URL shortener (2009-2014) found that 76.7% of destinations no longer load, quantifying the decay of the old web.