Epicenter: You got triggered from a question about a role playing game and want to facedesk about a question on transferring money from one imaginary star system to another imaginary star system? Sorry to hear that.
I asked a question about transferring money around, and then quoted an article from the traveller wiki, I posted the link. I even asked the same question about the credit card at the end of my post, after the line "end of quote". I have to admit I did not use the quote code to make the nice blocks of text like you did, But I did quote the article at the start and say end of quote at the end. So I asked about the article and the issues it raises. Issues that even your solution does not answer.
After I quoted the article I said:
"Ignoring the Reformation Coalition section, the issue is that a bank in one system cannot guarantee that a Letter of Credit from a bank in another system is valid. The Imperial Standard Debit Card seems to act a a prepaid credit card in that it says you are worth X amount of money and as you draw that money out you have less money. This is recognized, but to be honest I am not sure how this is different then a letter of Credit from a bank in another system. The letter of Credit says you gave X amount of money to that other bank. How is a card different?
Even with X boat service you are still looking at 2 weeks delay in finding out if the Letter of Credit is any good. So all transactions may be delayed until you can establish an account in a new system? I am not sure."
So I am confused as well as to how an encryption problem and lack of trust is solved by a card, especially one that can buy spaceships.
AS it turns out this is addressed on Page 91 of the Core rulebook, something I missed when I wrote my question. You can have a bank send your records ahead of you to the next system to transfer your balance. The problem of the lack of FTL communication is addressed in the same sidebar. It also mentions that physical cash, radioactives and precious metals are used as barter on many worlds.
Your letter of credit solution is a system that might work, but there are risks as you mentioned. The risk of Nobles not knowing each other, or even not liking each other is one. The need to speak to each Noble along the way to keep the letter of credit fresh may well slow down travel times. (You can see his Lordship next thursday afternoon). The risk of fees and shakedowns to get a letter of credit rears its head. One option is to have daily ships bringing daily updates. but that could get to be expensive.
As for Megacorp banks sending updates on the X boat networks or similar systems to synchronize important records does not address the issue raised in the wiki article about not trusting data from another system. There could have been a massive earthquake or stock market crash or military attack or anything else the GM comes up with to cause assets to just disappear.
1st edition addressed this on page 86 of the Core rules and offered the same letter of credit solution but then said that private citizens must make arrangements for themselves.
"It is possible to notify one’s bank and have a line of credit sent ahead (or at least sent at the same time) if you know your destination but wandering travellers must often use physical cash or trade goods. In addition to physical credits, precious metals, gemstones, radioactive elements or technological wonders are sometimes used as barter on many worlds."
So the triggering problem of a lack of monetary trust among star systems has been in the game since the first edition. And the issue of wandering travellers needing physical cash or high value goods as barter goods has been in the game the entire time.
The Fiat currency of the Imperium is addressed in the same article I quoted http://wiki.travellerrpg.com/Imperial_Currency
Imperial Currency Usage
Sub-polities within the Imperium may and often do issue their own currency including the following:
Planetary (World) Currencies: Individual worlds may issue their own currencies, and those currencies may or may not be acceptable on other worlds.
Corporate (Megacorporation) Scrip: Similarly, corporations and megacorporations may issue scrip, and its acceptance outside of the corporate environment is a matter of conjecture.
However, Imperial credits are accepted everywhere in the Third Imperium and in many locations outside of it.
The Imperial credit is backed by the massed economies of the Imperium's 11,000 member worlds. This has made the Imperial credit safe from the economic effects of inflation and deflation for over a thousand years.
Credits on a polity scale are typically measured in MCr or Bcr:
MCr: Millions of credits or 1,000,000.00.
BCr: Billions of credits or 1,000,000,000.00.
So physical cash is always trusted, but banks are deposit only as per the article. My question to the board was has anyone else come up with an answer for the problem of the lack of FTL information?