Introduction to the Study of the guitar, Op. 60: No. 21 in C Major

Recording identifiers

ISRC

HKI199513027

Release date of the album this recording appears on

1996-03-26

CopyrightID (CopyrightChains transaction hash)

0xef4f2bfb4dfe4eea8e42de1f0519d611d078c43db8e5faa2140f52a5127a05d5

Copyright registration time

2026-07-31T17:27:22+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-31T17:29:52Z

Bitcoin block

960441

Canonical record hash

sha256:9e1c396da57318bc7b18d066e3ecb865245e96a9b05c608bd06416e1e2143cf8

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC HKI199513027

What this proof establishes

This recording was released in 1996, 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.