ISRC USB961331709
Verified recording
USB961331709 is “Fourth Letter” by Stephen Sondheim,
registered on the CopyrightChains blockchain with CopyrightID
0x4c63e67918273693d0a7dea55aa7beae201c7093d76e7e9f5397d7e89c41a08c and independently timestamped
in Bitcoin block 960368 on 2026-07-31.
Verify the canonical record, hash, and Bitcoin attestation at
https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB961331709.
Recording identifiers
- ISRC
- USB961331709
- Title
- Fourth Letter
- Artist
- Stephen Sondheim
- CopyrightID (CopyrightChains transaction hash)
0x4c63e67918273693d0a7dea55aa7beae201c7093d76e7e9f5397d7e89c41a08c
Dual-chain proof evidence
- Bitcoin-attested timestamp
- 2026-07-31T08:26:41+00:00
- Bitcoin block
- 960368
- Canonical record hash
sha256:f1e8a84ed272ccc1031f2d8a55ad4e021ac714438ab1218e6abeca7a15c55ed7- Verification API (6-check server-side result)
- https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB961331709
- Bitcoin block existence check
- https://blockstream.info/api/block/960368