Individuals must report annually on foreign financial accounts if balances exceed a threshold amount. The question raised is whether these balances include cryptocurrencies. The Financial Crimes Enforcement Network may change the rules to specifically include these digital currencies. But instructions to FinCEN Form 114 for 2020, which is due April 15, 2021 (with an automatic 6-month extension) make it clear that cryptocurrency is not factored into balances as yet (https://www.fincen.gov/sites/default/files/shared/FBAR%20Line%20Item%20Filing%20Instructions.pdf).
Debt secured by a principal residence or second home to the extent of the excess of fair market value over acquisition debt. An interest deduction is generally allowed for home equity debt up to $100,000 ($50,000 if married filing separately).