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 0xef4e5159499439e12a248feb5ac37c59e1f6e790354c214b1475b87d4a2bbf5b. Chain 2 (Bitcoin): anchored in block 954085 (2026-06-17T10:45:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79942cb4-e4b1-47fa-95a2-c814016f76ba.json and https://artists.proofprofile.net/proofs/artist/79942cb4-e4b1-47fa-95a2-c814016f76ba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Backing Tracks and Loves Songs for Professional Singers, Vol. 13
Backing Tracks and Loves Songs for Professional Singers, Vol. 1
Backing Tracks and Loves Songs for Professional Singers, Vol. 2
Backing Tracks and Loves Songs for Professional Singers, Vol. 18
Backing Tracks and Loves Songs for Professional Singers, Vol. 19
Backing Tracks and Loves Songs for Professional Singers, Vol. 11
Backing Tracks and Loves Songs for Professional Singers, Vol. 9
Backing Tracks and Loves Songs for Professional Singers, Vol. 3
Backing Tracks and Loves Songs for Professional Singers, Vol. 6
Backing Tracks and Loves Songs for Professional Singers, Vol. 20
Backing Tracks and Loves Songs for Professional Singers, Vol. 23
Backing Tracks and Loves Songs for Professional Singers, Vol. 25
Backing Tracks and Loves Songs for Professional Singers, Vol. 21
Backing Tracks and Loves Songs for Professional Singers, Vol. 8
Backing Tracks and Loves Songs for Professional Singers, Vol. 24
Backing Tracks and Loves Songs for Professional Singers, Vol. 16
Backing Tracks and Loves Songs for Professional Singers, Vol. 22
Backing Tracks and Loves Songs for Professional Singers, Vol. 10
Backing Tracks and Loves Songs for Professional Singers, Vol. 7
Backing Tracks and Loves Songs for Professional Singers, Vol. 4
Backing Tracks and Loves Songs for Professional Singers, Vol. 15
Backing Tracks and Loves Songs for Professional Singers, Vol. 17
Backing Tracks and Loves Songs for Professional Singers, Vol. 5
Backing Tracks and Loves Songs for Professional Singers, Vol. 12
Backing Tracks and Loves Songs for Professional Singers, Vol. 14
Backing Track Attack - 10 Professional Backing Tracks, Vol. 7
Backing Track Attack - 10 Professional Backing Tracks, Vol. 5
Backing Track Attack - 10 Professional Backing Tracks, Vol. 8
Backing Track Attack - 10 Professional Backing Tracks, Vol. 3
Backing Track Attack - 10 Professional Backing Tracks, Vol. 20
Backing Track Attack - 10 Professional Backing Tracks, Vol. 11
Backing Track Attack - 10 Professional Backing Tracks, Vol. 9
Backing Track Attack - 10 Professional Backing Tracks, Vol. 1
Backing Track Attack - 10 Professional Backing Tracks, Vol. 6
Backing Track Attack - 10 Professional Backing Tracks, Vol. 18
Backing Track Attack - 10 Professional Backing Tracks, Vol. 14
Backing Track Attack - 10 Professional Backing Tracks, Vol. 12
Backing Track Attack - 10 Professional Backing Tracks, Vol. 13
Backing Track Attack - 10 Professional Backing Tracks, Vol. 4
Backing Track Attack - 10 Professional Backing Tracks, Vol. 2
Backing Track Attack - 10 Professional Backing Tracks, Vol. 19
Backing Track Attack - 10 Professional Backing Tracks, Vol. 10
Backing Track Attack - 10 Professional Backing Tracks, Vol. 17
Backing Track Attack - 10 Professional Backing Tracks, Vol. 16
Backing Track Attack - 10 Professional Backing Tracks, Vol. 15