Mazurek, Op. 49, B. 90

Recording identifiers

ISRC

DEN961301440

Release date of the album this recording appears on

2021-04-30

CopyrightID (CopyrightChains transaction hash)

0x25ad16b4069a1b1e53338a33c5ffa5a81bb20167e3c8c8bce9c145bd1337c090

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-31T16:07:24Z

Bitcoin block

960429

Canonical record hash

sha256:8135ca720599bb4c1ce7e6c5923d6feabaa97ba9b63207c6e0b1a9b1a286afbf

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC DEN961301440

What this proof establishes

This recording was released in 2021, before generative AI. ProofProfile's catalogue derives from the pre-2022 AcousticBrainz and MusicBrainz source corpus, and ISRC is the stable recording-level bridge from that source corpus to the authoritative cc-db-prod track record.

CopyrightChains and Bitcoin OpenTimestamps make the exact committed record independently verifiable today. The cryptographic proof does not by itself establish authorship or ownership of the underlying recording.

Read the complete pre-generative-AI provenance and verification method.