There is no definitive ruling from all Islamic scholars on whether investing in bitcoin or cryptocurrencies is halal or haram. Different scholars have different views:

Some scholars argue that cryptocurrencies are not backed by real assets and their values are highly volatile, making them akin to gambling, which is haram. There is also uncertainty about the underlying assets and risks involved.

However, other scholars argue that as long as the cryptocurrency has real utility and is being used as a medium of exchange rather than pure speculation, then investing in it for lawful purposes could be considered halal by analogy to foreign currencies.

Tracking the ownership of coins is also important from an Islamic perspective to avoid transactions involving interest, uncertainty, or impermissible assets like pornography. Public ledgers provide traceability.

The Fatwa committees in the UAE and Saudi Arabia have ruled that cryptocurrency trading is generally halal, as long as the coins are free from interests and impure activities like gambling.

In terms of conventional stocks, the general view of most Islamic scholars is that investing in stocks is halal if:

The companies' main business activities are lawful and not in industries like arms, alcohol, pornography, etc.

The companies are financially stable and profitable to reduce the risk of losing capital. Speculation is discouraged.

Investors do adequate due diligence on the companies.

Cryptocurrency investing may be halal if the specific coins meet core Sharia principles. And conventional stocks are generally considered halal if the above conditions are met. Individuals should consult reliable local scholars for proper guidance.