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 0x4160f7cd30abab7fdab9b861efae602b921593422c23c9a2690ece21ad1b1d8a. 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/95de07d4-3ddf-4ac6-97d5-d11184b35768.json and https://artists.proofprofile.net/proofs/artist/95de07d4-3ddf-4ac6-97d5-d11184b35768.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Handel: Viola da gamba Sonata in C Major: III. Adagio (Also Attributed to Leffloth)
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 0x270d6af301f8159cb968f06d41c5053f7358e1e67141d0eed911c9487096b822. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102613.
Vaughan Williams / Arr. Forbes: Fantasia on Greensleeves
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939713da63439342eae0a826bddaefaacc7b4cbde34d216106717a1487de822f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102614.
Cui: Kaléidoscope, Op. 50: No. 9, Orientale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28401d88bb2e8dcff9780fda568fcc9dd84a0798dc08e6eafdadd0a9b276390. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102615.
Brahms / Arr. Kreisler: 21 Hungarian Dances, WoO 1: No. 17 in F-Sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49694703e70592fd169a01a0ec1e7b875d1ad3d30a55ba0a98a9d51f2b0404a3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102616.
Gounod & Bach: Ave Maria (Arr. for Viola and Organ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2cafbd9268dd6941c03dfb1ac9266edd80e3dba4b94b897f622712eb521b488. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102617.
Bach, JS: Sonata for Viola da Gamba No. 2 in D Major, BWV 1028: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3b66d9bb6c5fd3f2130cd6520a3ed35825f997b183fba56ff793fa61e5ab3d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102619.
Bach, JS: Sonata for Viola da Gamba No. 2 in D Major, BWV 1028: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b707fded3944e0ac5f5e132f2d58e6657025a0cccfaab02004afcd13437fd3. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102620.
Saint-Saëns: Le Carnaval des animaux: XIII. Le Cygne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428dfc4238aba802bb81b42cf335a758855c2e18bdd5c475e14e03814b654db4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2102622.
Strauss, R: Don Quixote, Op. 35: Introduction. Don Quixote Sinks into Madness
The Great Cello Concertos: Dvořák, Schumann, Saint-Saëns, Elgar, Haydn...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab441bd4fae4661a91f42bf87f42b8d54a97409272be47e0db1ad90bba7441e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2200217.
Strauss, R: Don Quixote, Op. 35: Variation II. The Battle with the Sheep
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20efb14f887d856dc2e0be2f66173bcd10f3f5a7153351ebce251f5578d0e86b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2200220.
Strauss, R: Don Quixote, Op. 35: Variation III. Discourse Between Knight and Squire
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044b1e1de599a1761a3289939cf5eb676d431578d87a7620af9f55350b93cd49. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2200221.
Strauss, R: Don Quixote, Op. 35: Variation IV. The Adventure with the Pilgrims
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2089ccfa303d8268912a0e3fb86adc8c4f126cc3716dcbf41f798c293dda389c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2200222.
Strauss, R: Don Quixote, Op. 35: Variation VI. The Meeting with Dulcinea
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c820a087be145d74f8f89d6f334a9b418e47dca22e34c4183faa3a7c44c2dbc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2200224.
Strauss, R: Don Quixote, Op. 35: Variation VIII. The Voyage in the Enchanted Boat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1eb3753dcb94865b9f01d72cd9ab3bb25e0f004ace4a0c70e793e698f08013. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2200226.
Strauss, R: Don Quixote, Op. 35: Variation X. The Defeat of Don Quixote
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0d320bed282c8300db183475a0f5a9d21f91cf65eb6dafcfccd1a25afe6ee3. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2200228.