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 0xd94b51ecceacfce55343313d603e8a6db2a5f45dba82cfd33d3f2b17c0f595f7. 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/a9c0a875-3d4e-47c5-ad27-f0b8f0ecba8d.json and https://artists.proofprofile.net/proofs/artist/a9c0a875-3d4e-47c5-ad27-f0b8f0ecba8d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sinfonia to the oratorio Santa Beatrice d'Este in D Minor, WoO 1: I. Grave
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 0x5e1544554aaf4fc9de4c8230e95047648048fb53560d33c64c03cfd851b1b4f6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232718 — a six-check JSON result.
Sinfonia to the oratorio Santa Beatrice d'Este in D Minor, WoO 1: II. Allegro - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70666f60277c6c8fa6eef74f32ccc59a70948f41125e980ec57c272d6810a91d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232719 — a six-check JSON result.
Sinfonia to the oratorio Santa Beatrice d'Este in D Minor, WoO 1: III. Largo assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe30f6fb74463341e2c0a837546bcabf23082f20c6d75169eaad916bcdd3634b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232720 — a six-check JSON result.
Sinfonia to the oratorio Santa Beatrice d'Este in D Minor, WoO 1: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1082d482ede9dc4764901cd4a37e600079db0856eb488d1277a787a900b2cec9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232721 — a six-check JSON result.
Concerto grosso No. 4 in D Major, Op. 6: I. Adagio - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f8085f9fc0dcab43dda2007c1f15b9a5b03f767982a19088837081aa40983c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232722 — a six-check JSON result.
Concerto grosso No. 4 in D Major, Op. 6: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58279913ae1489e46dd4c21f9d87003ab6f7d63c6c20c4a587aa34dbada10aa9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232723 — a six-check JSON result.
Concerto grosso No. 4 in D Major, Op. 6: III. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5c04d637dbe6a3826263e004f79196f3b32f0932ac97e2816e02c014a63c94. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232724 — a six-check JSON result.
Concerto grosso No. 4 in D Major, Op. 6: IV. Allegro - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559de784eebce5033adc8187adf2545375be5560df3035239365edcce3026ada. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232725 — a six-check JSON result.
Concerto grosso No. 2 in F Major, Op. 6: I. Vivace - Allegro - Adagio - Vivace - Allegro - Adagio - Largo andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c649810e0bc3a243ce4e095b5a736492dc236d8b3444678e64d1479aa773c2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232732 — a six-check JSON result.
Concerto grosso No. 2 in F Major, Op. 6: II. Allegro - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375957e8dc2b3a8262b425aafbd88d9ba285c4eee36065531ac5c73f20d9b7b7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232733 — a six-check JSON result.
Concerto grosso No. 2 in F Major, Op. 6: III. Grave - Andante largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba54374bd357e58b7cf014e4b9779f400e1e9e4708ae77cbea33f6c01b1d880. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232734 — a six-check JSON result.
Concerto grosso No. 2 in F Major, Op. 6: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1c5b1a329dc84719d818f9785aa7ebdecc931a991ffed4f0084026fe50a573. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232735 — a six-check JSON result.
Concerto for Two Violins and Cello in G Minor, Op. 3, No. 2, RV 578a: I. Adagio e spiccato
Vivaldi: Les quatre saisons et autres concertos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429d60d56688a0d0b7306f5d61798b64848a90f1523a61e510ae03eebca4d800. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P70800180 — a six-check JSON result.
Concerto for Two Violins and Cello in G Minor, Op. 3, No. 2, RV 578a: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebb877051751d9b32fa3754bcef2382e16fdac34cf0b8f89951e27cfb0ed9f1. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FR1P70800190 — a six-check JSON result.
Concerto for Two Violins and Cello in G Minor, Op. 3, No. 2, RV 578a: III. Largo e spiccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52052cb69c387e2fc219db506d6553e26589370029b38ae727dd6ed0c9132fe8. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P70800200 — a six-check JSON result.
Concerto for Two Violins and Cello in G Minor, Op. 3, No. 2, RV 578a: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976fdb23113787e1dd227bffc3b3e92b44ddfee1d102ad66415892ec87ec781a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P70800210 — a six-check JSON result.