Relying on external sources is worse than relying on NXT itself. Maybe an alias could be better for that.
Why changing that data at all? If one issues an asset, IMHO the issuer must pay attention to a lot of things. So, the description will be one of them.
Yeah the description is pretty much the business plan and contract rolled in one.
If you issue "1oz .999 GOLD" it can not be changed to "1oz LEAD" or even "1oz .99 GOLD", because then you would be watering down the value.
But upon thinking about it, the Asset would need a website, with a prospectus, plans, goals, and reports for the users and prospective buyers.
Anon is planning on offering services as a Silver Bullion Gateway. If he created an IPO for his company, and received backing, then released shares, the shares would not be based on Silver price so much, they would be based on the amount of business he does, his reputation, and his cost of doing said business. The silver/NXT AE would be a SEPARATE asset, paired at market price. That ASSET description can not change. The value that buyers give to his asset, ie number of NXT vs 10oz Silver bars, will fluctuate, but the asset itself will remain 10oz Silver bars.
If he was EARNING 100NXT a day from the transactions, he could make plans to expand into GOLD or other precious metals, and therefore drive the value of AnonAsssetsInc upwards, and it would be important to know his business plans.
Real world example.
Barrel of Oil is an COMMODITY> 55gal drums. It has a set price ~ $110 lately right? Oil's price fluctuates on Supply and Demand.
EXXON is a COMPANY that drills oil. Exxon can't change the size, or function of OIL, it can only find more, process it more efficiently etc. Exxon's price fluctuates on earnings, profit, loss, future plans and general market principles.
AnonSilver10oz is a COMMODITY > 10oz bars. .999 pure, made by AnonMetalsInc
AnonMetalsInc is a COMPANY that makes, markets, sells and distributes precious metals, among which is AnonSilver10oz
10oz bars will never change their "Description"
Company could start making Frozen Yogurt, Diapers, or any other Assets. But the description would be the same.
EDIT
Do we need to create to AE classes? one commodity and one company?
Or is the commodity more akin to the colored coin of lore, and the company the DAC?