Jak léta jdou

Recording identifiers

ISRC

CZA120400180

Release date of the album this recording appears on

2021-11-19

CopyrightID (CopyrightChains transaction hash)

0x6f7aa74ed93920b72214e074f40c0090a895ddf0cccee91fbfca20bb9135dbb0

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-08-01T00:15:43Z

Bitcoin block

960487

Canonical record hash

sha256:783facb85f37069bfaa352d8dc9f3f81892aab92941ef5fdf075bd9f319448b9

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC CZA120400180

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.