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China In September 2017, China banned ICOs to cause abnormal return from cryptocurrency decreasing during announcement window. The liquidity changes by banning ICOs in China was temporarily negative while the liquidity effect became positive after news.[136] On 18 May 2021, China banned financial institutions and payment companies from being able to provide cryptocurrency transaction related services.[137] This led to a sharp fall in the price of the biggest proof of work cryptocurrencies. For instance, bitcoin fell 31%, Ethereum fell 44%, Binance Coin fell 32% and Dogecoin fell 30%.[138] Proof of work mining was the next focus, with regulators in popular mining regions citing the use of electricity generated from highly polluting sources such as coal to create bitcoin and Ethereum.[139] In September 2021, the Chinese government declared all cryptocurrency transactions of any kind illegal, completing its crackdown on cryptocurrency.
Further reading Chayka, Kyle (2 July 2013). "What Comes After Bitcoin?". Pacific Standard. Retrieved 18 January 2014. Guadamuz, Andres; Marsden, Chris (2015). "Blockchains and Bitcoin: Regulatory responses to cryptocurrencies" (PDF). First Monday. 20 (12). doi:10.5210/fm.v20i12.6198. S2CID 811921. Haynie, Dana L.; Duxbury, Scott W. (2024). "Online Illegal Cryptomarkets". Annual Review of Sociology.
Atomic swaps Atomic swaps are a mechanism where one cryptocurrency can be exchanged directly for another cryptocurrency without the need for a trusted third party, such as an exchange.