Gold, one troy ounce XAU
The issuers the book reads, for reference, normalised to one unit and set against one reference price.
Book: readingBook: unread
Tracked here
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PaxosPAXG
Reference
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TetherXAUT
Reference
Reference price
Chainlink XAU / USD.
The reference carries its own state and age. Against an unread reference the book shows no spread. How states work