Sonata for Two Pianos in D Major, K. 448/375a: I. Allegro con spirito

Recording identifiers

ISRC

NLB152100049

Release date of the album this recording appears on

2021-01-22

CopyrightID (CopyrightChains transaction hash)

0xb778d0285986b8d69589f9e5fcbf1ea6496fec1046a683369586f25b7fd1fbc6

Copyright registration time

2026-06-10T18:53:04+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-06-13T13:32:09Z

Bitcoin block

953520

Canonical record hash

sha256:a874df7a571e2129b1d9a5bb5452a8e1c1bccf34a9747f08c11a8bba99c9975f

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC NLB152100049

What this proof establishes

This recording was released in 2021, 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.