Requiem, K. 626: IVb. Hostias

Recording identifiers

ISRC

DEF057530010

Release date of the album this recording appears on

1976-01-01

CopyrightID (CopyrightChains transaction hash)

0xd10743c92f687bf720f676d96585bd8aa4dc28e664b4eb36c23f7e2e3e4db13d

Copyright registration time

2026-07-29T16:16:01+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-29T19:35:34Z

Bitcoin block

960138

Canonical record hash

sha256:b7630be5bb82b935f9504af5395eee76a7e92966e22f80c340b7e0df10073ab1

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Download the anchored registration record (its SHA-256 is the canonical record hash above)
• Recording evidence summary for ISRC DEF057530010

What this proof establishes

This recording was released in 1976, 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.