La Fanciulla del West / Act 1: Mister Johnson, un valzer?

Recording identifiers

ISRC

DEF057730531

Release date of the album this recording appears on

1978-01-01

CopyrightID (CopyrightChains transaction hash)

0xf39cd5d12261ecc8d52e167bd8f3bfc0f8e5a1acf17013fe68047f9fea96c877

Copyright registration time

2026-07-06T08:39:32+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-07T13:52:39Z

Bitcoin block

957043

Canonical record hash

sha256:2874606c401759385da0a6860c923fc9318cf6cafcc027b2b2e7546afc6f047b

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC DEF057730531

What this proof establishes

This recording was released in 1978, 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.