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Covers two-phase setup (Powers of Tau + circuit-specific), existing BN254 ceremonies (Perpetual PoT, Aztec Ignition), arkworks API limitations, and snarkjs/circom compatibility paths. https://claude.ai/code/session_01LJyL1uYXD1JHMq8Q3v7shM
Compares Poseidon (~240 constraints) vs SHA-256 (~30K) for in-circuit hashing. Covers arkworks support, transparent proof systems, hybrid design (Poseidon in-circuit + SHA-256 outside), and token format implications. https://claude.ai/code/session_01LJyL1uYXD1JHMq8Q3v7shM
Constructs a malicious circuit where K2 is the witness but key_hash comes from a different key K1. Verifies that the shared-wire binding in the R1CS prevents a prover from using different keys for the SHA-256 key hash and HMAC constraints. https://claude.ai/code/session_01LJyL1uYXD1JHMq8Q3v7shM
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