---
license: agpl-3.0
task_categories:
  - audio-classification
  - text-generation
language:
  - akk
  - en
tags:
  - music
  - ancient-music
  - hurrian
  - cuneiform
  - nft
  - zero-knowledge
  - steganography
  - da51
  - cbor
  - erdfa
pretty_name: "Retro-Sync: Hurrian Hymn h.6 NFT Collection"
size_categories:
  - 1K<n<10K
---

# Retro-Sync: Hurrian Hymn h.6 — 71-Shard NFT Collection

The world's oldest surviving notated music (~1400 BC, Ugarit) encoded as a
multi-layered NFT collection with ZK proofs and steganographic embedding.

## Collection

**71 DA51 CBOR shards** — one for each integer 1..71 (the crown prime).
20 generator shards (primes ≤ 71) carry the SSP interval structure.
51 derived shards (composites) carry content determined by prime factorization.

| Layer | Content | Format |
|-------|---------|--------|
| Source | Babylonian notation, interval mapping | text |
| Notation | LilyPond score (West 1994) | .ly |
| Artifacts | MIDI, PDF score, WAV audio | base64 in CBOR |
| Witnesses | Compilation chain (5 steps) | JSON |
| Eigenspace | Earth/Spoke/Hub decomposition | numeric |
| Metadata | Tablet, scribe, tuning, deity | structured |
| References | Wikipedia, scholarly, LilyPond docs | URLs |
| YouTube | Private audio comparison sources | URLs |
| Pipeline | SOP, erdfa CFT, boustrophedon, Cl(15) | text |
| ZK Proof | Groth16/BN254, MiMC Merkle tree | JSON |

## Structure

```
shards/           # 595 erdfa CFT-decomposed shards
nft71/            # 71 DA51 CBOR shards (real data, 11.2 MB)
  ├── 01.cbor     # reserved
  ├── 02.cbor     # ★ nīš tuḫrim (p2)
  ├── ...
  ├── 10.cbor     # WAV audio (8.4 MB base64)
  ├── ...
  ├── 71.cbor     # ★ colophon/crown (p71)
  └── manifest.json
proof/
  └── nft71_proof.json  # Groth16 proof
witnesses/
  └── hurrian_h6_witness.json
```

## Decoding

Each shard is a DA51-tagged CBOR envelope:
- Bytes 0-1: `0xDA 0x51` (magic)
- Bytes 2-9: SHA-256 prefix (CID stub)
- Bytes 10+: CBOR payload

```python
import cbor2, json
with open("nft71/02.cbor", "rb") as f:
    raw = f.read()
    magic = raw[:2]  # b'\xda\x51'
    cid = raw[2:10].hex()
    payload = cbor2.loads(raw[10:])
    print(json.dumps(payload, indent=2))
```

## ZK Verification

The Groth16 proof verifies:
1. Prover knows all 71 shard hashes
2. All form a valid MiMC Merkle tree
3. Eigenspace commitment matches (100% Earth)
4. Crown shard (p71) is unique

## License

AGPL-3.0-or-later. The underlying Hurrian composition is public domain (~3400 years old).

## Links

- [retro-sync repo](https://github.com/meta-introspector/retro-sync)
- [Wikipedia: Hurrian songs](https://en.wikipedia.org/wiki/Hurrian_songs)