ISRC USUM71206659
Verified recording
USUM71206659 is “Back When” by Nas,
registered on the CopyrightChains blockchain with CopyrightID
0xe270adb209f6f23cac9fb5ab81eff9d143814972bdf59b5355d3d143d9dae5dd and independently timestamped
in Bitcoin block 953520 on 2026-06-13.
Verify the canonical record, hash, and Bitcoin attestation at
https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUM71206659.
Recording identifiers
- ISRC
- USUM71206659
- Title
- Back When
- Artist
- Nas
- CopyrightID (CopyrightChains transaction hash)
0xe270adb209f6f23cac9fb5ab81eff9d143814972bdf59b5355d3d143d9dae5dd
Dual-chain proof evidence
- Bitcoin-attested timestamp
- 2026-06-13T13:32:09+00:00
- Bitcoin block
- 953520
- Canonical record hash
sha256:c8291c8613e7bea0c3d4e38ee42455559b0cc05e1f2cfaccb6a3e9f4b8f13e0c- Verification API (6-check server-side result)
- https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUM71206659
- Bitcoin block existence check
- https://blockstream.info/api/block/953520