thumb|right|250px|Editing Eugenio Toussaint Eugenio Toussaint Uhtohff (October 9, 1954 – February 8, 2011) was a Mexican composer, arranger and jazz musician. Eugenio died from an antidepressant's o
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 0x3fd43c4546d50814e748113b2ffc71f4b3fd5f6006884316f84ae3c85a354604. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b40c252-cb33-4151-b87b-0c1963c143a5.json and https://artists.proofprofile.net/proofs/artist/8b40c252-cb33-4151-b87b-0c1963c143a5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Toussaint, E.: Danzas De La Ciudad / Suite De Las Ciencias / Dias De Los Muertos Suite
Toussaint, E.: Gauguin / Guitar Concerto / Bouillabaisse
Toussaint, E.: String Quartet No. 1 / Estudio Bops Nos. 1-4 / 5 Miniaturas De Paul Klee / Kaleidoscopio
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xab988ece1ded0c94ac93f0404549ef893f254ff77dfcf12ec48a517bb42ba61b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXD782102530 — a six-check JSON result.
Que Rico Mambo (arr. E. Toussaint for wind ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb333ac17905ae223f4a0399d99bbf670345db4772720d239d0afb4034e37ec6c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DET901226002 — a six-check JSON result.
Mambo No. 8 (arr. E. Toussaint for wind ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3937a5d83597b52bbae40e1e8e0d8043eb027203524b3a85dff71a4c73cb331b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DET901226003 — a six-check JSON result.
Concerto for Improvised Piano, II (2006)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc399ef5647cb3c223bb4b18b4144d884eb8acceb3fe9b849b91afd1f22d65f85. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11001007 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbe8f0cc49d9f4a50469444a86904fd9086c412d40db42b1ac8d4ef83787e6c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHZ41913211 — a six-check JSON result.