ISRC SEWDL0724804
Verified recording
SEWDL0724804 is “Etude for Piano: Guero (1970)” by Helmut Lachenmann,
registered on the CopyrightChains blockchain with CopyrightID
0xbb2e3218161ef4e0e5cc59e40b0d2b0a3438a29c46ca932ca6eb13244fce5798 and independently timestamped
in Bitcoin block 960276 on 2026-07-30.
Verify the canonical record, hash, and Bitcoin attestation at
https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0724804.
Recording identifiers
- ISRC
- SEWDL0724804
- Title
- Etude for Piano: Guero (1970)
- Artist
- Helmut Lachenmann
- CopyrightID (CopyrightChains transaction hash)
0xbb2e3218161ef4e0e5cc59e40b0d2b0a3438a29c46ca932ca6eb13244fce5798
Dual-chain proof evidence
- Bitcoin-attested timestamp
- 2026-07-30T16:01:17+00:00
- Bitcoin block
- 960276
- Canonical record hash
sha256:2ba0f035d0164b4b74fd02c5430c55fd87d4d0497d9c2cefa07227836a530dee- Verification API (6-check server-side result)
- https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0724804
- Bitcoin block existence check
- https://blockstream.info/api/block/960276
Full record
Track page: Etude for Piano: Guero (1970) · Machine-readable JSON-LD