We Used to Bach (We Used to Know / Bach Prelude C Major)

Recording identifiers

ISRC

GB5KW1602532

Release date of the album this recording appears on

2017-03-24

CopyrightID (CopyrightChains transaction hash)

0x15f2a6f46cfabe1e4c949d760a12bf9164a2caa2a1726e4e0e49d3a830aa654c

Copyright registration time

2026-06-25T12:10:20+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-02T03:55:08Z

Bitcoin block

956304

Canonical record hash

sha256:84fb6557c0894b01a1da5ea743a3f52c18db6557bf51d8cc17f22065725f5abc

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC GB5KW1602532

What this proof establishes

This recording was released in 2017, 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.