Can i trust on etherium project
I want to hold it for long term 5-10 years
Can i use hardware wallet (ledger or trezor)?
Ethereum is one of those coins that will leave the market one of the last, so you can buy it and keep as much time as you need, do not be afraid that it will turn into a slag in a short time
Ethereum is the best-trusted altcoin. Therefore, it will be used for many years. Naturally, you can hold it for long. The cryptocurrency will be gaining. Probably, it will go to the Moon even in 2019.