1. https://cointelegraph.com/news/tether-mistakenly-minted-5-billion-usdt-and-immediately-burned-them
2. https://www.ccn.com/news/dash-51-attacks-defeat-instant-transactions/2019/07/12/
3. https://www.theblockcrypto.com/tiny/congressional-leaders-have-drafted-a-bill-that-would-ban-big-tech-from-launching-a-digital-asset/
4. https://blog.0xproject.com/shut-down-of-0x-exchange-v2-0-contract-and-migration-to-patched-version-6185097a1f39
5. https://cointelegraph.com/news/bitcoin-mining-industry-is-booming-as-difficulty-soars-14-to-new-high