Byliśmy kiedyś w Warszawie

Recording identifiers

ISRC

PL90Y2391648

Release date of the album this recording appears on

2023-07-09

CopyrightID (CopyrightChains transaction hash)

0xafb8dbbbb6a9490d953fb9c30c7cb790154cec97dd1685746e6959eefd0293ac

Copyright registration time

2026-07-07T22:09:58+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-08T03:22:41Z

Bitcoin block

957120

Canonical record hash

sha256:560506d5fa20497140d102627229ab3471634c2613f619eafc2e7742c4a38a42

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC PL90Y2391648

What this proof establishes

This recording was released in 2023. ProofProfile's artist catalogue derives from the pre-2022 AcousticBrainz and MusicBrainz source corpus, and this recording entered the record through cc-db-prod's ISRC-linked registration. Its provenance rests on the dates stated above rather than on the era of that source corpus.

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.