Letters From Karl Marx To His Wife Jenny

Recording identifiers

ISRC

HKI199201620

Release date of the album this recording appears on

1996-02-15

CopyrightID (CopyrightChains transaction hash)

0x567acabded6d60683398106d78aa192d84b008b59fb0bbcf8c61d56efcbc401b

Copyright registration time

2026-07-07T10:08:01+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-08T03:20:19Z

Bitcoin block

957118

Canonical record hash

sha256:7da15e3136ae14883259b0528ecf66793a0b1863effb4a3f35528597b4752cd6

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC HKI199201620

What this proof establishes

This recording was released in 1996, 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.