Streamr DATAcoin is a cryptocurrency that is used within the Streamr platform for buying and selling data. As with any cryptocurrency, the legality of using DATAcoin depends on the regulations and laws in your specific jurisdiction.

In general, cryptocurrencies are not illegal, but they do operate in a legal gray area in many countries. Some countries have embraced cryptocurrencies and have established clear regulations for their use, while others have banned or heavily restricted their use.

It is important to research the laws and regulations regarding cryptocurrencies in your country before using DATAcoin or any other cryptocurrency. In some countries, using cryptocurrencies may be legal but regulated, while in others it may be illegal or restricted.

Additionally, it is important to note that the use of cryptocurrencies can be associated with risks such as volatility, security concerns, and potential for illegal activities such as money laundering and tax evasion. It is important to use caution and conduct thorough research before engaging in any cryptocurrency transactions.

In conclusion, the legality of using Streamr DATAcoin or any other cryptocurrency depends on the laws and regulations in your country. It is important to research the legal status of cryptocurrencies in your jurisdiction and to use caution when engaging in cryptocurrency transactions.