I see so many services offering to double, triple and multiple in all possible amounts the coins you put to them. This doesn't sound very convincing to me but some of them are offering the list of blockchain transactions as a proof that coins were credited. Is this pure scam like I think or is there a possibility to realy make some coins? Would like to hear your thoughts and experiences.
Yes that is totally Ponzi Scheme, Doubling bitcoins was scattered in the social media, for sure they've victimize a lot of subscribers out there for sure. And most blockchain txid was artificially fake record only.