Madama Butterfly, Act II: Coro a bocca chiusa "Humming Chorus" (Coro)

Recording identifiers

ISRC

GBAYC8600165

Release date of the album this recording appears on

1966

CopyrightID (CopyrightChains transaction hash)

0x5728ce99764c5989cea4d3e6154d43e9410cf997201cc25b2990ac9a39d23885

Copyright registration time

2026-06-11T04:02:10+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-06-13T13:32:09Z

Bitcoin block

953520

Canonical record hash

sha256:e6c42d15ab6a56fac23d50bf32c0b35878dce87e7488538d5a3f9351e954c2ad

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC GBAYC8600165

What this proof establishes

This recording was released in 1966, 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.