I tried to look into the transaction history of the Wolfram Blockchain. I tried this:-

translist = Flatten[BlockchainBlockData[#]["TransactionList"] & /@ Range[1010, 1020]];
BlockchainGet /@ translist

As you can see, between block 1010 and 1020, around 50% of the Blockchain are meaningful messages (e.g. images, number, formulae, graphs etc.), while the remaining 50% of them are the noises. When the block number increase, the percentage of meaningless messages increase. What are those noises and why would they appear?

Many thanks!