mixnet spec details

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Sphinx refs:

• https://cypherpunks.ca/~iang/pubs/Sphinx_Oakland09.pdf
• https://github.com/nymtech/sphinx

Loopix refs:

• https://arxiv.org/abs/1703.00536
• https://github.com/UCL-InfoSec/loopix

Nym refs:

• https://nymtech.net/nym-whitepaper.pdf
• https://nymtech.net/nym_litepaper.pdf
• https://github.com/nymtech/nym/tree/develop/sdk

Coconut refs:

• https://arxiv.org/abs/1802.07344
• https://nymtech.net/docs/coconut.html
• https://nymtech.net/docs/bandwidth-credentials.html
• https://github.com/nymtech/coconut

cc @a-moreira

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potentially relevant: Masterclass #7 — "Hardware Optimization for Cryptography-based Applications" with Chelsea Manning