Captain Jack - Live April 1972 At Sigma Sound Studios, WMMR Radio, Philadelphia, PA

Recording identifiers

ISRC

USSM11000341

Release date of the album this recording appears on

1973-11-07

CopyrightID (CopyrightChains transaction hash)

0xe4623bf65f4f415c095be002198eb92aebf02f9813119bb956829bb666b880da

Copyright registration time

2026-06-17T20:21:42+00:00

OpenTimestamps proof evidence

Bitcoin-attested timestamp

2026-07-02T03:30:09Z

Bitcoin block

956302

Canonical record hash

sha256:1a8a4b2013d37c653013bee063256379037d043ecd19dc9d3abe540845c9a1ca

• Verify the CopyrightID on CopyrightChains
• Verify the Bitcoin block independently
• Read the machine-verifiable OTS result
• Recording evidence summary for ISRC USSM11000341

What this proof establishes

This recording was released in 1973, 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.