References:

• Trump, Bitcoin, scam, president - https://www.bbc.com/news/business-57392734
• FBI, hackers, pipeline - https://edition.cnn.com/2021/06/07/politics/colonial-pipeline-ransomware-recovered/index.html
• Salvador - https://www.forbes.com/sites/theapothecary/2021/06/07/el-salvador-to-make-bitcoin-legal-tender-a-milestone-in-monetary-history/?sh=34176ac275b9