ISRC NLK4J2200002
Verified recording
NLK4J2200002 is “Sonata for Two Pianos: II. Grave” by Willem Pijper,
registered on the CopyrightChains blockchain with CopyrightID
0xd58790b5fafe06a100ad89062f0655ab632c6cab6bb667bde458764417a4cec6 and independently timestamped
in Bitcoin block 957118 on 2026-07-08.
Verify the canonical record, hash, and Bitcoin attestation at
https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK4J2200002.
Recording identifiers
- ISRC
- NLK4J2200002
- Title
- Sonata for Two Pianos: II. Grave
- Artist
- Willem Pijper
- CopyrightID (CopyrightChains transaction hash)
0xd58790b5fafe06a100ad89062f0655ab632c6cab6bb667bde458764417a4cec6
Dual-chain proof evidence
- Bitcoin-attested timestamp
- 2026-07-08T03:20:19+00:00
- Bitcoin block
- 957118
- Canonical record hash
sha256:283cbb9d10cdab820bc8b6a0ece8b7d290318921a76fc87687eece789f2d840e- Verification API (6-check server-side result)
- https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLK4J2200002
- Bitcoin block existence check
- https://blockstream.info/api/block/957118
Full record
Track page: Sonata for Two Pianos: II. Grave · Machine-readable JSON-LD