you are right.Sometimes this kind of problem happens.

the list of scam poject list
1. Dago Mining
2. Acash coin
3. Ach coin
4. Hyponix
5. AFCE
6. AIS
7. ARTCOIN
8. OrionX
9. Bitagro
10. BITWINS
11. Health Care Cash
12. Freelanex
13. GOOREO
14. HiveNet
15. Vera Exchange
16. Hitmex Exchange
17. IDLV
18. Bitcollar
19. VITA
20. INEL

Blockchain is a system of recording information in a way that makes it difficult or impossible to change, hack, or cheat the system.Each block in the chain contains a number of transactions, and every time a new transaction occurs on the blockchain, a record of that transaction is added to every participant's ledger.
I want to know more about Blockchain.

Bitcoin, often described as a cryptocurrency, a virtual currency or a digital currency - is a type of money that is completely virtual.
It's like an online version of cash. You can use it to buy products and services, but not many shops accept Bitcoin yet and some countries have banned it altogether.
Each Bitcoin is basically a computer file which is stored in a 'digital wallet' app on a smartphone or computer.
People can send Bitcoins (or part of one) to your digital wallet, and you can send Bitcoins to other people.
Every single transaction is recorded in a public list called the blockchain.
This makes it possible to trace the history of Bitcoins to stop people from spending coins they do not own, making copies or undo-ing transactions.

i think trezor wallet,Blockchain wallet,coinbase wallet is the safe and best wallet for btc.i always use this wallet.it is very secure.