Goldman Sachs (GS.N) CEO Solomon told France's Echo on Friday that Goldman Sachs is doing a lot of in-depth research on cryptocurrencies. He believes that the future payment system will depend on the blockchain. Solomon said that Goldman Sachs "absolutely" hopes to catch up with the trend of cryptocurrency. Solomon said it is too early to judge which digital currency or platform will eventually win. Goldman Sachs spokesman Lenihan declined to comment on Solomon’s comments.