Zu Zweit (feat. Cassandra Steen)

Recording identifiers

ISRC

QM6MZ2100290

CopyrightID (CopyrightChains transaction hash)

0xa2a505fe61c61895549de533c2a863fe445911aa47a6203cb2b2889f1c4387c7

Copyright registration time

2026-07-06T07:38:53+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-07T11:43:09Z

Bitcoin block

957032

Canonical record hash

sha256:fcd67181aaff65d468cde530e531aaef2b13c9d3018ff209fcd87f1ae88b9acd

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result

What this proof establishes

This recording belongs to ProofProfile's historical evidence base derived from the pre-2022 AcousticBrainz and MusicBrainz corpus. 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.