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 0x867b114a0d65fcec9210af304c9a0729157a22a49eedc42102223ebf20194f46. 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/ff706dcf-514a-40bf-9c62-1c742dfcc518.json and https://artists.proofprofile.net/proofs/artist/ff706dcf-514a-40bf-9c62-1c742dfcc518.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vorschule im Klavierspiel, Op. 101 Nos. 12-21
Vorschule im Klavierspiel Op. 101 Nos. 12-13: Moderato
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 0x72588369cd3266b4840fbd1b2dccd9b3be06ba790032145d96bfdb59dc4e0853. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBSMU8696462.
Vorschule im Klavierspiel Op. 101 No. 14
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c2e5737a2d45e7b8f623499817e4105d7ca4151ff07f1d4c58f5ce95338488. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/GBSMU8696463.
Vorschule im Klavierspiel Op. 101 No. 15
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd42e9af59f4163d35b37449c24df8a5aa77fa5b1cd7c732de850de4ddacf8bd. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/GBSMU8696464.
Vorschule im Klavierspiel Op. 101 No. 16: Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ac976b0f39a8a8cd9e07e92daafaba7770a46ed12443dcdd08b32ac4941f11. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBSMU8696465.
Vorschule im Klavierspiel Op. 101 No. 17: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea367b32a2afedaefd643534384346cbb6f6b355aeae88064c2566da86ee0293. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBSMU8696466.
Vorschule im Klavierspiel Op. 101 No. 18: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2db1c759502da5830d8dc09673db737369cceb8c0292acf3cc5ce2a9bc9ea6d. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/GBSMU8696467.
Vorschule im Klavierspiel Op. 101 No. 19: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8eaed2c7d24b57903ad894ccde0521d0f70e00b3e27f32f356d513bf588125. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/GBSMU8696468.
Vorschule im Klavierspiel Op. 101 No. 20: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410913aff58f70d94be0d71bb5fb15e4de45ec1193a59ea5f0f32f24caf46122. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/GBSMU8696469.
Vorschule im Klavierspiel Op. 101 No. 21: Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1bb258c142ea1aebc040ec78d713f4f649f928e779167dc9e1bf9c2efe977b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBSMU8696470.