one of my friends have 45 BTC in his pocket.(which was bought 5 years ago).
Need expertise advice how to use them effectively??
If he is looking for multiply them, I believe Gambling and HYIP are not good idea to risk them. Even ICO also not recommended if he is not a subject matter expert. But again, what needed to do depends on lot more factors like, his age, what he is wanted to do (multiply or trade) etc. If it is me (in my middle age), I would use very few of them trading to fait currency and at least 80% of them in HODL. But if the age is < 55 he better inform about this to someone else. Coz, even BTC cap is 21M, I believe some are lost from the market in wallets while death of the owner. Also, it’s good to have them in a hardware wallet.