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 0xf7f796e16eb2f189931a12613ca082f646ba14f837dcc74466aab2c9b3f9d47c. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/969fe66a-23b6-4cc1-ba83-9b4bd78dd8ac.json and https://artists.proofprofile.net/proofs/artist/969fe66a-23b6-4cc1-ba83-9b4bd78dd8ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Clara et Robert Schumann - musique de chambre pour cor
12 Klavierstücke für kleine und große Kinder, Op. 85, No. 12: Abendlied (Arr. for Horn and Piano by Louis-Philippe Marsolais)
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 0x19c9d48b701e26a689faa587fae838cc08a985cbee30ef73fc5f1e270067ee30. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722387412.
Concerto For Cello No. 1 In C Major, Hob. VIIb:1: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9693f9c81a2855ac240849a772fa27256140070d74f66883518d73c8bc5bbdaa. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722485101.
Concerto For Cello No. 1 In C Major, Hob. VIIb:1: III. Finale. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21ac6e8bd6038d3977d75d542016f0ecb559ee4bcdd131bc59418ef2da6b15d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722485103.
Concerto For Cello No. 2 In D Major, Hob. VIIb:2: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb8becdc674d06d44d737ec6bad2134beaf20b81602ab07535434a5d6876b79. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722485104.
Haydn: Concerto For Cello No. 1 In C Major, Hob. VIIb:1: III. Finale. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe195140bdb1f9c716402ebc9474f65a50779201e28e7ea3bf0c3851aac828862. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722182008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a77b1246bcc5f789f6be165270edeeb0bdc7101761c6f7b8ad52704139152ca. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CAJ722080501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91f91dbbb3d97ba3ec4a7e3e22b7d2a29860c2d0b86d61f40ddd1e18e0cb5f0. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722080502.
Sonate pour violoncelle et piano, FP 143: II. Cavatine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd97fd206233f2319f6f6f282810c52eedbb08e0526598f9ee33b25e52903e6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ721978702.
Chansons bretonnes pour violoncelle et piano sur des thèmes de l’ancien folklore, Op. 115 : 1. La prophétie de Gwenc’hlan (1er Recueil, No. 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f294a013f64aa58074487b1703fa5afc8ffbd6b2df725d5d4aa55b6b4bfd369. 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/CAJ721978708.