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1. CME Bitcoin futures trading volume and open interest reached a record high in May. 2. Data display: Kazakhstan LocalBitcoins bitcoin transaction volume hit a record high. 3. Data display: Suspected due to the existence of a large number of exchanges in the sale of goods, the four major exchanges accounted for only 7% of the total 24-hour trading volume. 4. Kodak introduced a blockchain-based document management system. 5. Research: 74% of mining activities rely on renewable energy. 6.BM: Block.one has invested $150 million in its social application Voice. 7. The US Internal Revenue Service has identified a number of specific issues for cryptographic taxes, including whether taxpayers need to pay taxes.