El Salvador made bitcoin a legal tender, Singapore has not made bitcoin a legal tender, the second country that makes bitcoin a legal tender is Central African Republic.
El Salvador has envisioned the future use of Bitcoin by issuing;
• the world's first sovereign Bitcoin bonds
• building a Bitcoin City, of which the intention is for one to be free of income, property and capital gains taxes.
They are way ahead of the pack, unlike Singapore who still pokes at bitcoin with it's regulatory agents.