NOT BITCOIN but better.
One use of Bitcoin is for anonymous transactions, i.e., as a substitute for ordinary cash or bank notes.
The problem is that the currently available bitcoins fluctuate in value. The ideal is a bitcoin that is stable for at least a certain determinate or even indefinite time against a major currency, such as the US dollar. In short, we want or need an alternative bitcoin that is like a dollar banknote. We imagine this alternative works better than keeping banknotes under the mattress or in a safe deposit box, because it avoids thievery and the transaction costs of going to the safe deposit box.
It can be done. The easiest is for the US Fed to do it. It would allow anyone to buy something we might call the official bitcoin dollar in exchange for a guarantee that bitcoin dollars are exchangeable into US banknotes. If this works, it will be because it would reduce the costs now paid by the central bank for printing currency and going after counterfeits. In this scenario, the blockchain ensures that counterfeit official bitcoins cannot exist.
Another way is for a major private bank to ‘create’ its bitcoin dollar. Imagine that Chase does it, and calls it the Chase bitcoin dollar. All it is is a special debit card account where Chase guarantees to make the Chase bitcoin dollar exchangeable for cash. The guarantee is in effect a promise that Chase will honor Chase bitcoin dollar liabilities ahead of its any other liabilities. To ensure such a guarantee, Chase would enter into a ‘currency board’ arrangement with the US Fed by maintaining Fed fund balances in a separate special account solely for the purpose of redeeming Chase bitcoin dollars. In short, the fractional nature of the private banking system will not apply to bitcoin dollars.
The blockchain also allows Chase to ensure that no other entity can create Chase bitcoin dollars. The ‘supply’ of Chase bitcoin dollars will always be the same as the demand for such dollars.
Any other private bank would be allowed to participate in a ‘branded’ bitcoin currency. I can imagine HSBC issuing special debit cards for HSBC bitcoin dollars, HSBC bitcoin euros, or HSBC bitcoin yen. They may be allowed to compete through enhancements on convenience of use, allowing for fee-free global transfers, or even the payment of interest.
One important enhancement would be US consumer protections against fraud now being given to users of credit cards. Any merchant declining to honor a bitcoin debit card would be presumed to be up to no good.
The similarity with bank notes will have to be carried to an extreme that meets certain anonymity and privacy standards. The issuer of a bitcoin dollar will have to honor the bearer of the account provided that said bearer satisfies identity requirements.
At the same time, the use of such accounts will have to be protected by bank secrecy rules, but subject to money-laundering limits. For example, bitcoin dollar transactions in a particular account cannot exceed $10,000 per day, and a bank cannot allow a depositor more than one bitcoin dollar account. A maximum-balance limit of, say, $100,000 per account, could be imposed, in parallel with limits now applied under existing deposit insurance schemes.
Central banks could also impose limits on how many bitcoin dollar accounts an individual can have. To protect banks from money-laundering, bitcoin dollar accounts would not be available to corporations.
Will the advent of such official or private bitcoin dollars kill the existing bitcoins? It could, especially if bitcoins continue to be more attractive as speculation vehicles than as means of payment.
But bitcoin exchanges could create ‘hybrid’ bitcoins whose ‘mining’ or supply-side arrangements are fully transparent, and whose value could be stabilized in some fashion desired by the bitcoin holder. In short, there could be different bitcoins for different purposes. Caveat emptor and ‘know your customer’ rules would still be needed. However, such bitcoins would remain without guarantees similar to deposit insurance, and they may still be vehicles for speculation.
My best guess: Bitcoins will evolve, i.e., the fittest will survive. The Dutch tulip variety will become extinct. As of now, they’re pretty much as primitive as Dutch tulips.