Implement trusted setup ceremony infrastructure for Groth16 circuits

ceremony/attestations/README.md

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+# Ceremony Attestations
+
+This directory contains signed attestations from ceremony participants.
+
+## Purpose
+
+Each participant signs an attestation confirming:
+1. They generated genuine randomness
+2. They followed the ceremony process
+3. **They destroyed their toxic waste**
+
+These attestations create public accountability and transparency.
+
+## Attestation Format
+
+Each attestation is a text file (optionally PGP-signed) containing:
+
+```
+BitCell Trusted Setup Ceremony Attestation
+
+Ceremony: [BattleCircuit | StateCircuit]
+Round: N
+Date: YYYY-MM-DD
+Participant: [Name or Pseudonym]
+
+I hereby attest that:
+
+1. I generated the contribution independently using genuine randomness.
+   Entropy sources used: [description]
+
+2. I verified the input parameters matched the published hash.
+   Input hash: abc123...
+
+3. I ran the contribution tool and verified the output.
+   Output hash: def456...
+
+4. I securely destroyed all files containing toxic waste:
+   [detailed destruction method]
+
+5. To the best of my knowledge, no copies remain.
+
+6. I acted in good faith to support BitCell security.
+
+Signature: [PGP signature or contact info]
+Date: YYYY-MM-DD
+```
+
+## Files
+
+After the ceremony completes, this directory will contain:
+
+- `battle_round_01_alice.txt` - Alice's attestation for BattleCircuit round 1
+- `battle_round_02_bob.txt.asc` - Bob's PGP-signed attestation
+- `state_round_01_alice.txt` - Alice's attestation for StateCircuit round 1
+- ... (one file per participant per circuit)
+
+## Verification
+
+To verify a PGP-signed attestation:
+
+```bash
+# Import participant's public key (if available)
+gpg --import participant_pubkey.asc
+
+# Verify signature
+gpg --verify battle_round_01_alice.txt.asc
+```
+
+For unsigned attestations, verification relies on:
+- Matching to public transcript
+- Cross-referencing with coordinator records
+- Community recognition of participant identity
+
+## Status
+
+**Current Status:** Awaiting Ceremony (Q1 2026)
+
+This directory will be populated as participants contribute to the ceremony.
+
+---
+
+**Last Updated:** December 2025  
+**Ceremony Status:** Planning Phase