ISRC DEF057900723
Verified recording
DEF057900723 is “Polonaise in A-Flat Major, Op. 53 "Heroic": Maestoso - Pt. 3” by Frédéric Chopin,
registered on the CopyrightChains blockchain with CopyrightID
0xd61338ddfed0cfb3a9b3084b5ba7db417c3d65e98fa9c8d91a0bb19bd2e3b075 and independently timestamped
in Bitcoin block 960455 on 2026-07-31.
Verify the canonical record, hash, and Bitcoin attestation at
https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057900723.
Recording identifiers
- ISRC
- DEF057900723
- Title
- Polonaise in A-Flat Major, Op. 53 "Heroic": Maestoso - Pt. 3
- Artist
- Frédéric Chopin
- CopyrightID (CopyrightChains transaction hash)
0xd61338ddfed0cfb3a9b3084b5ba7db417c3d65e98fa9c8d91a0bb19bd2e3b075
Dual-chain proof evidence
- Bitcoin-attested timestamp
- 2026-07-31T19:53:13+00:00
- Bitcoin block
- 960455
- Canonical record hash
sha256:a9b10a219f6460a32d66cb625179f26c232da6c8840a4b9f75cfd622d9d4684a- Verification API (6-check server-side result)
- https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057900723
- Bitcoin block existence check
- https://blockstream.info/api/block/960455
Full record
Track page: Polonaise in A-Flat Major, Op. 53 "Heroic": Maestoso - Pt. 3 · Machine-readable JSON-LD