First off, thank you for your valuable insights, I hope to see more of you on this thread for purposes of academic discussion. From my initial reading of your answer, seems like you are adept in the legal profession seems like you are lawyer or law student (like myself) or someone indeed in the legal field.
This doesn't make much sense. Bitcoin could replace/become alternative to fiat money, not to the things you've listed. You can have bitcoin debit card, you can use Bitcoin for remittance, payments and have Bitcoin as an element of the financial system.
Bitcoin debit cards are just ingeneous compromises people have done so that bitcoin can be used in the current financial system. What actually happens there is that bitcoins are converted into fiat and ultimately used to pay for stuff. Also remember that these are all still under a financial institution like banks. Not to mention all bitcoin debit cards are either Visa or Mastercard, both of which can be classified as dealing only with fiat and a centralized agency.
Remittance is possible, but the receiver will likely need to convert it to fiat to be able to use it in today's economy and financial system.
Payments are possible but is very limited. There are only a few that directly accepts bitcoins as payments.
As an element of the financial system, would still be far fetch right now since it has not yet been massively adopted.
The very first thing for the government to regulate is to decide how to treat Bitcoin for the tax purpose. The easiest way is to pull it under definition of either asset/commodity or foreign currency (i.e. is bitcoin mining or trading subject to income tax and/or VAT etc).
Good take on the legal aspect of bitcoin for taxation purposes. However, this goes beyond the scope of my topic and this topic as well. Generally, this does not affect consumers in a dangerous way since taxes are innate in all civilized societies or societies with a government.
- You'd need to define very basic stuff like who owns bitcoins - is owning/knowing private key enough to constitute bitcoin owner? i.e. if you guess someone's brainwallet passphrase - can you legally keep bitcoin, or is it illegal?
Plausible argument, however, I think this will still be classified as theft and that the bitcoins obtained through such methods are illegally obtained. I believe to constitute ownership of anything is that you actually owned it. Owning means that you created it, acquired it through legal means (purchased, received as payment, donation, successions, and other ways of acquiring ownership under the law). In this case what happened is something like the thief hacked into the online banking account of the victim and stole what is in it.
- Is Bitcoin fungible by law? Say if hacker steals BTC from the exchange and then use it (fully or partially) to buy something from you - will you get to keep BTC, or will it be seized from you?
Just for the sake of everybody else that is not adept in the terminologies of the law, "fungible" means that the goods an be mixed with other goods that are exactly similar in quality. Take for example Jasmine rice, it can be mixed with other Jasmine rice, and everybody who owns it can just claim how much he owns of the stockpile.
I would say this is indeed a possible problem not for the immediate parties to the theft of bitcoins, ie the owner and the hacker, but it is a possible threat to the third parties that will receive the stolen bitcoins.
As an illustration:
1. Say B hacked A's bitcoin wallet.
2. B pays C, with the stolen bitcoin.
Can any government compel C to return the stolen bitcoins? Not sure if we can apply negotiable instruments law here (can't say it is the same for all countries though).
3. continuation from about illustration. C pays D and D pays E.
Can any government compel E to return the stolen bitcoins?
From the illustration, I think there is a grey area now. Since there is no law that says that you need to verify that the person sending you bitcoins have legal rights over the bitcoins he is sending. In the case he sends you illegally obtained bitcoins then how can investigators know that you are not part of the crime or you are not the criminal himself who stole the bitcoins? If you are not the criminal but just merely a victim as well because you received illegally obtained bitcoins then can you invoke that you obtained the said bitcoins for value?
Note: This is really a good argument you have put out and this will likely go into my research.
- How to deal with the refunds? If I buy faulty item for $20 worth of BTC and want to return it a week later, do I have a right to demand refund in BTC even if it's now worth $30? Does the merchant get to decide whether he refunds me in fiat or BTC?
I've thought about this initially and wrote it on my paper. For illustrative purposes, for example, B, the buyer, sent $100 worth of bitcoins today or 0.02
BTC to buy a Trezor from S, the seller. After a few days of using it, B realized that there is a hidden defect in the item, however both B and S only came to an agreement that S will refund B after three months. By that time, prices have already gone up by double the price when B bought the Trezor. The question will be, should S return $100 worth of bitcoins or should he return 0.02
BTC which was the amount B sent?
- What is "Bitcoin"? Who gets to decide it? What happens when the network splits in 2 (or 3, 4 etc...) and all the sides decide to keep the name, so now you have multiple chains called "Bitcoin". Which one is the "real" one, if any? Can I create my own fork and sell coins as "bitcoins", if not - why? Who owns the name. This one is particularly difficult to regulate, as the law would need to define clear and measurable set of rules (i.e. law cannot just state that "majority of users decide what Bitcoin is", it would need to define both: who the "user" is and how to measure users' support etc).
Also, no government will "regulate Bitcoin", they would "regulate cryptocurrency". So regulators have to take into account all the different coins/tokens, which can have significant differences (different algos, some may not have blockchain, different anonymity levels, some tokens could be paying dividends etc).
I would not like to discuss forks in the paper as it will further complicate things in a technical level. Generally I am writing only on bitcoins as most cryptocurrencies are quite different than bitcoins, well a whole lot of them are so different in terms of usage, functionality and overal their code.