1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd167dcb6ac30641d043426e30f647ef1533191e262f8cd5d0eb5243e642eec2a. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c6971353-9715-40d5-a8ba-5a2c5ed0486b.json and https://artists.proofprofile.net/proofs/artist/c6971353-9715-40d5-a8ba-5a2c5ed0486b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
50s Central - Pop and Rock n Roll Backing Tracks, Vol. 2
50s Central - Pop and Rock n Roll Backing Tracks, Vol. 3
50s Central - Pop and Rock n Roll Backing Tracks, Vol. 4
50s Central - Pop and Rock n Roll Backing Tracks, Vol. 1
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Big Ballad Central - Classic Backing Tracks, Vol. 1
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Men Only Central - Classic Backing Tracks for the Male Voice, Vol. 2
Men Only Central - Classic Backing Tracks for the Male Voice, Vol. 3
Men Only Central - Classic Backing Tracks for the Male Voice, Vol. 4
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Rock and Punk Central - Classic Backing Tracks, Vol. 1
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Reggae and Ska Central - Classic Backing Tracks, Vol. 3
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Rock and Punk Central - Classic Backing Tracks, Vol. 5
Rock and Punk Central - Classic Backing Tracks, Vol. 4
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The Ultimate Ska Collection - Gold Series, Vol. 1
The Ultimate Ska Collection - Gold Series, Vol. 2
The Ultimate Ska Collection - Gold Series, Vol. 3
The Ultimate Ska Collection - Gold Series, Vol. 4
The Ultimate Ska Collection - Gold Series, Vol. 5
The Ultimate Ska Collection - Gold Series, Vol. 6
The Very Best of Instrumental, Chart Hits Through the Years, 50 Classics, Vol. 3
The Very Best of Instrumental, Chart Hits Through the Years, 50 Classics, Vol. 2
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The Very Best of Instrumental, Chart Hits Through the Years, 50 Classics, Vol. 5
The Very Best of Instrumental, Chart Hits Through the Years, 50 Classics, Vol. 8
The Very Best of Instrumental, Chart Hits Through the Years, 50 Classics, Vol. 6
The Very Best of Instrumental, Chart Hits Through the Years, 50 Classics, Vol. 9
The Very Best of Instrumental, Chart Hits Through the Years, 50 Classics, Vol. 10
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Backing Tracks for the Discerning Professional, Vol. 5
Backing Tracks for the Discerning Professional, Vol. 4
Backing Tracks for the Discerning Professional, Vol. 3
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Backing Tracks for the Discerning Professional, Vol. 7
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Backing Tracks for the Discerning Professional, Vol. 11
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Backing Tracks for the Discerning Professional, Vol. 21
Backing Tracks for the Discerning Professional, Vol. 23
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Backing Tracks for the Discerning Professional, Vol. 20
Backing Tracks for the Discerning Professional, Vol. 22
Backing Tracks for the Discerning Professional, Vol. 25
Backing Tracks for the Discerning Professional, Vol. 18
Backing Tracks for the Discerning Professional, Vol. 24
Backing Tracks for the Discerning Professional, Vol. 19
Backing Tracks for the Discerning Professional, Vol. 15