ISRC USUM72215141
Verified recording
USUM72215141 is “Black Napkins - Live In Zagreb, November 21, 1975” by Frank Zappa,
registered on the CopyrightChains blockchain with CopyrightID
0xbcd9eb1f304cc61d1a439828054e541e9b71d4c89e031ee8a2f2b935b2a73ea2 and independently timestamped
in Bitcoin block 957073 on 2026-07-07.
Verify the canonical record, hash, and Bitcoin attestation at
https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUM72215141.
Recording identifiers
- ISRC
- USUM72215141
- Title
- Black Napkins - Live In Zagreb, November 21, 1975
- Artist
- Frank Zappa
- CopyrightID (CopyrightChains transaction hash)
0xbcd9eb1f304cc61d1a439828054e541e9b71d4c89e031ee8a2f2b935b2a73ea2
Dual-chain proof evidence
- Bitcoin-attested timestamp
- 2026-07-07T18:39:05+00:00
- Bitcoin block
- 957073
- Canonical record hash
sha256:78a542584099112752ca9790a7dc4e60323a74f80379d5c4f11859091a00a515- Verification API (6-check server-side result)
- https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUM72215141
- Bitcoin block existence check
- https://blockstream.info/api/block/957073
Full record
Track page: Black Napkins - Live In Zagreb, November 21, 1975 · Machine-readable JSON-LD