Epic: Gud Privacy Sets

[iAmMichaelConnor]

A likely-long-living epic to track improvements to Aztec privacy sets.

Low-hanging fruit

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1. Set all tree roots of the final private kernel circuit to nonzero, _valid_ values. #1676
   A-privacy-leakage +1
2. PXE should fuzzily choose a recent root, when generating a tx for sufficiently-old notes.
3. Populate all fields in the private kernel circuit to be nonzero, valid values.

Privacy Sets

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1. Propose a standard for privacy sets.
2. Pad all side-effects according to standardised privacy sets. (Q: pad in kernel or account contract?)
3. Archive publicly-available testnet tx data #8939
   A-privacy-leakage T-feature-request +2
4. Analyse publicly-available tx data, to help determine privacy sets.

Tooling

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1. A tool to inform of bad privacy practices to aztec smart contract devs.
2. A tool to inform PXE users of bad tx fingerprints.