We also need a detailed explanation of why we can trust blackbytes cannot be duplicated.
The fact that they are not on a ledger and therefore transparent makes it suspicious to many and it is a very sensible question that needs to be answered in a FAQ
Can anyone provide it?
The genesis unit of blackbytes is public:
https://explorer.byteball.org/#qO2JsiuDMh/j+pqJYZw3u82O71WjCDf0vTNvsnntr8o=Every blackbyte comes from there, there can't be more than defined. Double-spend or duplicatio is avoided with a
spend proof, I invite you to read the chapter 25 of the whitepaper to learn more about it.
By the way you can see blackbytes have different denominations from 1 to 100000 blackbytes, like they were bank notes.