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i would like to ask about this coin Bitcoin Vault . it has a high return of profit. is it a scam or not.
The best person to answer the question if its a scam or not is only you. We may only be able to provide you a guide. Here is what you need do to be safe:
1. Research about them on reputable sources.
2. Is their business model sustainable or ponzi.
3. Who is behind the project?
This will surely help to arrive on a decision.