What if the creators of a new cryptocurrency gave out new units of the cryptocurrency in exchange for shares of a stock or bond index fund, held these shares in reserves, and allowed owners of the cryptocurrency to redeem them back for shares in the index fund? Wouldn't this effectively peg the cryptocurrency to such a fund?
Wouldn't such a system offer a lot of stability, desperately needed in today's most popular cryptocurrencies?
What kind of issues would the creators or the consumers of the cryptocurrency run into with such a system?