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 0xb3c9fe06334259c0b27ebd5676bb5a3aadff06cad229e6c7321fed6649ed7c87. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/947c9901-de55-4f26-b38d-f8e6779778e0.json and https://artists.proofprofile.net/proofs/artist/947c9901-de55-4f26-b38d-f8e6779778e0.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sibelius: King Christian II, Incidental Music, Op. 27: IV. Fool's Song of the Spider
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 0xadf9fb90aa68848fcb8c60fcf40e0e849a3cdaf2764b824cca4148c930403f41. 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/FIFIN9600321 — a six-check JSON result.
Beethoven / Mozart / Wagner / Mussorgsky: Opera Scenes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658fcde5769f08688d3fe3988ff63441ff710b5d048302f51b2465ae519bc168. 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/SEAED8774040 — a six-check JSON result.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Veni, creator spiritus -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496c323ca8b729c385385a23af16820efcc3a3ed222f320ccfa6b40dc6aae453. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/SEAEH9400010 — a six-check JSON result.
Shostakovich: Lady Macbeth of Mtsensk District
Lady Macbeth of Mtsensk District / Act 1: Akh, ne spítsya ból'se, popróbuyu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db02326b42c9cf0d67b5be91de43c5ece9167f04375d418acbd0329421ec7b6. 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/DEF059231201 — a six-check JSON result.
Lady Macbeth of Mtsensk District / Act 1: Gribkí segódnya búdut?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7125ad97d309657f26ee3fb55dc87559528be642de8042a4be5aa03eaf0548ad. 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/DEF059231202 — a six-check JSON result.
Lady Macbeth of Mtsensk District / Act 1: Govorí - ... - Cegó vstal?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d66e272bb240e64912498333840c9bb174d1effa4e32e933b0e5d760c8655a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEF059231203 — a six-check JSON result.
Lady Macbeth of Mtsensk District / Act 1: Interlude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d77dbb7a9f364bb324b5ad65ceda8c2c4ff176ea3504e282517589cbafa0b4. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEF059231204 — a six-check JSON result.
Lady Macbeth of Mtsensk District / Act 3: Cto tï - ... - Interlude (Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69de2ef80db1b7eb34d566d2947caf8b695084b485bb81b933882b16592fbfe4. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEF059231219 — a six-check JSON result.
Lady Macbeth of Mtsensk District / Act 1: Ay! Ay! Ay! - Otpustíte bábu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94630f9fec991823e5eb704f7487fe38f6d3aa49152663fb36f3942a613f013f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEF059231205 — a six-check JSON result.
Lady Macbeth of Mtsensk District / Act 1: Mnógo vï - Cto ego?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06a9d5bb8628e7252c2c24d969e24dcaa5a7efef18a77878cc7f9c613109b22. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/DEF059231206 — a six-check JSON result.
Lady Macbeth of Mtsensk District / Act 1: Interlude (I)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659bd75858620bb9ecb3fa61401e8e3349d9857626b0e6b362b22f4e67d4e30b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEF059231207 — a six-check JSON result.
Lady Macbeth of Mtsensk District / Act 1: Spat' porá. Den' prosól
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a6a6967cb147fd3346060caa03284a12f5eead3420c7e9e5b1f4e798febbb4. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEF059231208 — a six-check JSON result.
Lady Macbeth of Mtsensk District / Act 1: Zerebyónok k kobïlke torópitsya
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0dfa28fd931af7670753a79492798d710d5817a4ce9cef4070c0b91df23141. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEF059231209 — a six-check JSON result.
Lady Macbeth Of Mtsensk District / Act 1: Kto eto - ... - Uydí tï
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6cdd9334a9288263d559075f2e11e16d7abd37a58fb6071b1351e9e6b7a1688. 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/DEF059231210 — a six-check JSON result.
Lady Macbeth of Mtsensk District / Act 2: Interlude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2334879e1f101e47e44f0d66f228bf41e4b324b17a65236bb540e894a0f505. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEF059231215 — a six-check JSON result.
Jean Sibelius: Musique Religieuse Op. 113 - Masonic Ritual Music