Le nozze di Figaro / Act 2: "Voi che sapete" - "Bravo! che bella voce!"

Recording identifiers

ISRC

NLA507100942

Release date of the album this recording appears on

1971-01-01

CopyrightID (CopyrightChains transaction hash)

0x115c77d67cf6edafbeb6011dc0a2bed396e2c05540c974d1fe3a931b39167d06

Copyright registration time

2026-07-07T00:11:23+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-08T03:20:19Z

Bitcoin block

957118

Canonical record hash

sha256:fb09721dcec870e5d1cb77ef9469fa655cf8291f52c511bad74c909993c33847

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC NLA507100942

What this proof establishes

This recording was released in 1971, 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.