ISRC DEF057900721
Verified recording
DEF057900721 is “Polonaise in A-Flat Major, Op. 53 "Heroic": Maestoso - Pt. 1” by Frédéric Chopin,
registered on the CopyrightChains blockchain with CopyrightID
0x7e789546f4e8c7e6fefe20666545246aefb806affc11488e000106a00e3f8a31 and independently timestamped
in Bitcoin block 960344 on 2026-07-31.
Verify the canonical record, hash, and Bitcoin attestation at
https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057900721.
Recording identifiers
- ISRC
- DEF057900721
- Title
- Polonaise in A-Flat Major, Op. 53 "Heroic": Maestoso - Pt. 1
- Artist
- Frédéric Chopin
- CopyrightID (CopyrightChains transaction hash)
0x7e789546f4e8c7e6fefe20666545246aefb806affc11488e000106a00e3f8a31
Dual-chain proof evidence
- Bitcoin-attested timestamp
- 2026-07-31T04:14:58+00:00
- Bitcoin block
- 960344
- Canonical record hash
sha256:b42cad545ad18c4db4700373ac672a480ae3ad6a66b7e03e88d9b2dcaec2923f- Verification API (6-check server-side result)
- https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057900721
- Bitcoin block existence check
- https://blockstream.info/api/block/960344
Full record
Track page: Polonaise in A-Flat Major, Op. 53 "Heroic": Maestoso - Pt. 1 · Machine-readable JSON-LD