question: for example, when creating a cold storage wallet in bitcoin blockchain, the user must import his/her private key."
Capitalize this past sentence correctly.
A: For example, when creating a cold storage wallet in Bitcoin blockchain, the user must import his/her private key."

question: you can use our software contenta converter premium to convert thousands of rw2 to jp2. everything in one go and in just a few easy steps.
Capitalize this past sentence correctly.
A: You can use our software Contenta Converter PREMIUM to convert thousands of RW2 to JP2. Everything in one go and in just a few easy steps.

question: research also indicates that lack of sleep can affect the hormones leptin and ghrelin in such a way that we become overweight.
Capitalize this past sentence correctly.
A: Research also indicates that lack of sleep can affect the hormones leptin and ghrelin in such a way that we become overweight.