I'm not sure such an economy would work. To the extent that it might, that's probably going to be about social structure and values, not economics.

I realize that may not be the most worldbuilding-esque answer, but as I see it your fundamental issue is that you've designed a system to be internally consistent (I assume, I'm not sure I understand the technical details fully) without much thought dedicated to how that system would interact with the actual world, or the people that would use it. Hence your question.

So let's abstract away the technical details, at least to rough out how the economy might function. The overwhelmingly key question to be answered seems to me to be:

Is your currency intrinsically valuable, or is it only a token of exchange?

If people are essentially trading experiences, would one person care about having the experience itself (a lot would be essentially duplicates, at least in any meaningful way. How many bowls of soup would a person want a record of eating?)? In at least some cases the experience would be rare and interesting, but the vast majority would be minor variations on common experiences. Because of this it seems clear that there would be no fixed value to a quale.

In this case supply and demand forces would be odd, because an original core experience would be much more valuable than a common one, and the validation mechanisms shouldn't be able to enforce a common value of any individual quale.

Would some people try to monopolize experiences of a given type, and sell them at exorbitant prices? Would there be a thriving rental market? Do people lose qualia in a transaction, in exchange for something new? If so, how would peoples' identities handle the constant shifting of remembered experiences? Would they cling to their own subjective ones, regardless of market value (like remembering the birth of your child, or an intimate moment with a loved one)? Would people work in exchange for customizing their remembered experiences, essentially valuing the person they want to be vastly more than the "balance" of qualia in their accounts?

And, importantly, if the qualia are intrinsically valuable, how does the market react to inflation? Can my subjective experience of a quale on Tuesday be traded to you on Wednseday, generating a new "echo" quale of your experience of my experience? What would the value relative to the original be like? Could it be more valuable, if something about my own experience is different, adding to the original experience? Can people assess the quality of a quale before completing a transaction? If not, what opportunities for fraud and deception exist, and what mechanisms exist for protecting against them? As time passes, even rare qualia will be more or less duplicated, diluting their value.

I imagine there would be a major drive in society to mint original qualia, riding ahead of a wave of ever-inflating and ever-less-valuable existing qualia and their derivatives. How easily can meaningfully novel qualia be produced, and how much ability does the average person have to produce them?

Relating the value of qualia to physical goods or services also seems hard. How many experiences, and of what type, would a farmer be willing to trade for a discrete, physical potato? If the amount of meaningfully distinct experiences is relatively fixed, at what point does a farmer have enough experiences to not be willing to engage in further transactions in exchange for production of physical food?

If the qualia are simply tokens of exchange, you retain the issues of varying quale value but don't have to deal with the identity crises. It becomes essentially a fiat currency, but one with a largely fixed supply.

In thinking about these questions, a couple of your goals for the currency seem to be shaky to me. I'm not convinced that qualia can be:

Be passively accumulated as wealth and actively generated as transactions

Given the overwhelming similarity of most day-to-day experiences (unless you've got some wild social/experiential setup), the passive accumulation of experience likely wouldn't be worth much. Especially if qualia cannot be destroyed, inflation should quickly drive the relative value of most individual qualia to virtually nothing. Most people will be poor by dint of the commonness of their life experience.

Everybody could be willing to give their life to obtain

Rare and precious experiences maybe, but outside of novelty of experience or self-identity construction, why would people value these so highly in most cases?

Everybody can agree to be truly precious

This is similar to the above. If we're talking about forming your own identity or dealing in rarity, then maybe. Otherwise, a lot of daily experience seems like it would be valued as trash.

tl;dr: As laid out, I don't see why people would use qualia as currency if they had other options. Answering that question will set the stage for the actual use of the currency. If you're set on this system, the society in which it operates will have to be molded to fit, and that involves arbitrary choices on your part.