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 0x49819346768a79201f6c6f67dce609b25be9f79dbbb6e1b6a17da0025394c489. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5f89621-f847-40cd-a2f8-d10389ef7063.json and https://artists.proofprofile.net/proofs/artist/b5f89621-f847-40cd-a2f8-d10389ef7063.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
3e Livre de Sonates à violon seul et basse continue, Sonata Sexta: I. Adagio
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 0x18a6e4b0fd0aca856cebd9714fab9f7980a0f2bbc03bebb20b38804b9b46740a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR50X2202201.
3e Livre de Sonates à violon seul et basse continue, Sonata Sexta: II. Corrente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0522f49b4a39fb578299991762fccf83eda34f6221078705d235127cbe7c14b. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:29:30Z), 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/FR50X2202202.
3e Livre de Sonates à violon seul et basse continue, Sonata Sexta: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a51a2f60e185e761110f2c3f3523d2d5b5bbecce290cee239c02b28343840ab. 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/FR50X2202203.
3e Livre de Sonates à violon seul et basse continue, Sonata Sexta: IV. Aria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ff0c12f09d0ccde1fdff8f9d6cc88bc86d4e7dfef9cb9b33a6b4a71f675ac9. 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/FR50X2202204.
2e Livre de Sonates à violon seul et basse continue, Sonata X: Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a8a3102ca76a476c8fcb840ef796e78abe87137151bd96427e0a7656908709. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR50X2202205.
Violin Sonata in F Major, Op. 5 No. 4: I. Adagio (Version for Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb84869f2f9341c8932ec3b1b983a6babb5b1d8c64d5dc7ac38473b1e6ea016. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR50X2202206.
Violin Sonata in F Major, Op. 5 No. 4: II. Allegro (Version for Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecce908adbcd7791ad838738a34a17b243065a39f4a5a6764c5589f9cc830c3f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X2202207.
Violin Sonata in F Major, Op. 5 No. 4: III. Vivace (Version for Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69b8c29f6ef851f7c846d2c67c627b3007e29e8f98719add8b02f6f3c98d4a1. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:02:34Z), 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/FR50X2202208.
Violin Sonata in F Major, Op. 5 No. 4: IV. Adagio (Version for Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe1b4f501d9a9d7245b57c4e1533702414ab26f67842d3516628619cb4b1943. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR50X2202209.
Sonata seconda du IIème Livre de Sonates à violon seul et basse continue: Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413ac202b878c6aa1b00cb6e74bc78dbe789e40f3b25b8c45d0b931f30e14e13. 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/FR50X2202211.
Sonates à violon ou flûte seule avec basse continue, Op. 14, Sonata 4: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4e87dbc6a7d6d7c8b7d0ceca104924a3aa5a12ece7f73328397db5afe987b3. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/FR50X2202212.
Sonates à violon ou flûte seule avec basse continue, Op. 14, Sonata 4: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037b2ef1a155adaa3371b3cb43216e48bcd88d2262664c00f809bb32919206c9. 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/FR50X2202213.
Violin Sonata in C Major, Op. 5 No. 3: I. Adagio (Version for Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c413ae1ca3aecfbf2c8eefda9843db4f9aba717327be38b07fa96722314964. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR50X2202215.
Violin Sonata in C Major, Op. 5 No. 3: II. Allegro (Version for Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1075015077e389d4c38f47dc9c74fd4229ad1a419e755da7f16fcfb4c61bcb. 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/FR50X2202216.
Violin Sonata in C Major, Op. 5 No. 3: III. Adagio (Version for Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2eec9e65d0a93010ce4dfed66f55921937783247171fdc402dc0682c06e3f5. 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/FR50X2202217.
Violin Sonata in C Major, Op. 5 No. 3: IV. Allegro (Version for Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92a973cb712a40ee7765c32a8650a261b9f92e261339f4b4d1bfea69a2bc3c4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR50X2202218.
Violin Sonata in G Minor, Op. 5 No. 5: I. Adagio (Version for Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b80b9fd2c16c1de35953abd707e15c1eea9bcd516de3c7d945d33aeb9f5621e. 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/FR50X2202221.
Violin Sonata in G Minor, Op. 5 No. 5: II. Vivace (Version for Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163bc89cbc28408836276f2ef3ab57ad7addf8235c8fe38688b7f96a0fe568ad. 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/FR50X2202222.
3e Livre de Sonates à violon seul avec la basse continue, Sonata Quarta: I. Un poco andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe3804b402748f7cb49e0593a27c6be62b629e84d6007b9c1dc32c82d9a2e6d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR50X2202226.
3e Livre de Sonates à violon seul avec la basse continue, Sonata Quarta: III. Sarabanda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4832c39d182039ba7fb49b6178b36e07b34bb73890cedbd2a46bbe5ef54629f. 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/FR50X2202228.
Violin Sonata in F major, Op. 5 No. 4: V. Allegro
Beethoven, Kuhlau & Doppler: Variations on Folk Songs
Mozart, Hummel & Beethoven: Concerto, Sonate, Symphony