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 0xd5facacbf111891cb8dc749d28c5ee2b8a01f887f2d74c8b65b64a2912ca231a. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0cfc738f-4f72-4b87-891c-9bc4dd58f117.json and https://artists.proofprofile.net/proofs/artist/0cfc738f-4f72-4b87-891c-9bc4dd58f117.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xab061539050dfd73fa858c0b0c49f40e1f3f8983aa567435fe048548e3b1bd5a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEB112304901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb7c8d9809d8dda1298e155d5faa5c2c861a1682ab35ca888dbcf80c77fdfa1. 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/DEB112304902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b10aae28bdd7df66216a603e340d07a3679fe95803cc6cbb78258e2cbed58ca. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DEB112304903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82c2cdcc8c11f1643b891d691f3fafddbc2525f8974edec296f682056086c7e. 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/DEB112304904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eec96c675151fd80616ffd55dd560feef06c6166fda8dd14598cbf956c45f71. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/DEB112304905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42fd2658f77c6d9afb2bc62d853a6fec476e3344226e87c63dc7341a2671fe16. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DEB112304906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b6b4fc72c5201ffb5abae81dd18599917c1bff4e91a70d0f9111083a701219. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/DEB112304907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cb3c50452e5c06aa4e51e928ff22a074db1cc7e082936fd385e869060dbbcd. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEB112304908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5402a9ec6606d9dab6f991619b5399cace2b6461470a57531d8de288812eb0b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB112304909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc321840e28410080b81fb57b2492eece2c4f262d5908125b3c3dd5227ef2d5. 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/DEB112304914.
Bestiaire: II. La chenille & III. La chèvre du Thibet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc434c9f18a8c53ca8d4d451ff7f01d0eda141f8769302ad63bb1b9f0b8d69eac. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEB112304916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ce79c2b2dfd0ab8e9c8461a49b29ee6543fdf5b5f9be3efedb233eb2282910. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DEB112304917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8040df377be3b9745fe522bfe200d566792feb7678937d8bcd285ff4ddfd445. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB112304918.
Messe pour double chœur (Œuvres a cappella de Frank Martin, Willy Burkhard et Cyrill Schürch)