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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20b4d71317c537964e95e5307e60b77e8868814cd29027ba5c8a972a7b2173c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd11d5f3-72d0-4851-a519-c92045f7744a.json and https://artists.proofprofile.net/proofs/artist/fd11d5f3-72d0-4851-a519-c92045f7744a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Poulenc, Messager, Horovitz, Jeanjean, Françaix, Martinů & Bassi: Music for Clarinet and Piano
Horovitz: Sonatina for Clarinet and Piano: I. Allegro calmato
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85a5359c16fd1626fa0b16c8fdaccb44b8db1167f63c04a58fc0281a46afce5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0301898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1620faaa4d276c77faade6ebfffacaed668b9004dea129ebb6296b111e0756f. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/GBAYC0301895.
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
Horovitz: Sonatina for Clarinet and Piano: II. Lento, quasi andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b6b99c8f5a97e66ad9312be300cab8ac1c9232843e58cc1f315020ec1109dc. 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/GBAYC0301899.
Horovitz: Sonatina for Clarinet and Piano: III. Con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc629f5f6d1d11ec73d1a7d7104d5dc3896b4c141d2c06cbab9260a3ef316696. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0301900.
Lieder ohne Worte V, Op. 62: VI. Allegretto grazioso, MWV U161 "Spring Song" (Arr. Ottensamer for Clarinet & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27fb2119b256450d6a42432a829db2630113a982474131e249f35997b27102e. 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/DEN962000330.
Lieder ohne Worte VII, Op. 85: II. Allegro agitato (Arr. Ottensamer for Clarinet & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6112dd245e5d1018e7b9342deabfa01c524bd81d8db3bc5752431e585b93cf8a. 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/DEN962000300.
Lieder ohne Worte VI, Op. 67: V. Moderato, MWV U184 "The Shepherd's Complaint" (Arr. Ottensamer for Clarinet & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e45c4b69206ede3566ba1cce5ff12ef7605f5e8c9a2178188dfb6297dc30e9. Chain 2 (Bitcoin): anchored in block 957056 (2026-07-21T23:11:48Z), 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/DEN962000220.