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 0xfe1c02eccf11b1a80c78ee525807d62f83c9abe0363cb5089905a8b26a5b09f3. 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/d9c567dd-1ec6-4173-8fe6-99a6d1566c26.json and https://artists.proofprofile.net/proofs/artist/d9c567dd-1ec6-4173-8fe6-99a6d1566c26.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Piano Sonata No.2 in B-Flat Minor, Op. 35: I. Grave - Doppio movimento
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 0x1a262efa78e0c8bcb695ae22a7f125e6190efc47bcb99fc4e91a085d8f20db56. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USSM12409478 — a six-check JSON result.
Piano Sonata No.2 in B-Flat Minor, Op. 35: II. Scherzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab1a689baaa968c6b375beae98eb3cc5f8cd5a5ceef7df003221ed71246a55b. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T07:27:32Z), 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/USSM12409479 — a six-check JSON result.
Piano Sonata No.2 in B-Flat Minor, Op. 35: III. Marche funèbre (Lento)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f41bf0d403d5d0b810ef72625f4b033c7d1cc4b30aeaac9bd5fb6abfcdc2c8. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/USSM12409480 — a six-check JSON result.
Piano Sonata No.2 in B-Flat Minor, Op. 35: IV. Finale (Presto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b680b2ba4390f6336b9365f263d3a7f2c06b59d487ac171281b3d8fd8d32ddd. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12409481 — a six-check JSON result.
Nocturne No. 7 in C-Sharp Minor, Op. 27, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2baf6af9e91f597bdd850450bc38452e11f61401bcaf603063cb783dc054f7c8. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12409482 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae00b6ac5daa80c7765aea71d094d820882d8fa2e4b18734e0cf4782abb146f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USSM12409484 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6996c74f51215f68916a5bb5cc3dcb8dfd559ea08517e3db2e7080bd56b6eafd. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12407841 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0adf1008dd1120de3a9cb6124275796752ab5fba1363aa2a7cb41e75365b3db. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12409488 — a six-check JSON result.
24 Preludes, Op. 11: No. 11 in B Major - Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fd2ffd5e6119b8e9c12bcd2132513f2fe391958e379bbf3be30a5f3a4d2030. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12408595 — a six-check JSON result.
Piano Sonata No. 2 in G-Sharp Minor, Op. 19 "Sonata Fantasy": I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0b6d1c6a859779b8f182419c4274c562318b0d39a40691aa9cae44575a9f34. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12409490 — a six-check JSON result.
Piano Sonata No. 2 in G-Sharp Minor, Op. 19 "Sonata Fantasy": II. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d000dca67687b030c5332f1cc8c23f83a99ecc86d54dba01538eff99ee5bf38. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12409491 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6996c74f51215f68916a5bb5cc3dcb8dfd559ea08517e3db2e7080bd56b6eafd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12407841 — a six-check JSON result.
Saint-Saëns: Carnival of the Animals: The Swan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c11c6b055f0e50269dcf04462af71029c3c4ab38d2ee909dbf190a57d9a98f8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2000214 — a six-check JSON result.