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 0x585fab9eccd45fc450ce6976ad8b5a1c1769526c8d13d77c754308178bdb6298. 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/59e9446d-0229-48bf-9d59-998a4f117cfa.json and https://artists.proofprofile.net/proofs/artist/59e9446d-0229-48bf-9d59-998a4f117cfa.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Vorschule im Klavierspiel, Op. 101 Nos. 45-50
Vorschule im Klavierspiel, Op. 101 No. 45: 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 0x059b844229136d4367ca506d97d429c7ba08c815c34f738e44f809e1a7331dad. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX89G2241808 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 No. 46: Comodo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441196af5d1e8d19eb95be9c2f2de871870374729aca00363c104f91b82a8f77. 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/GX89G2241765 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 No. 48: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0830c0046e13a146274570395bbc4325b114948ad463e5fad05435cf1ddc54a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX89G2241783 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 No. 49: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8238c9b4a3f382e580170562c7e7a3e9824d7940c18dd057046d907e63e17110. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX89G2241800 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 No. 50: Comodo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5239bbd570f42c040fbb1066ead1d3f04649cc4ab28765e4d9df2b95db65e256. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX89G2241811 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 Nos. 22-25
Vorschule im Klavierspiel Op. 101 No. 22
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe227ff8bcf00b545863eb48a1cf9ba8f304ce38ad7419c981ce0aa8c3533d59c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBSMU9177394 — a six-check JSON result.
Vorschule im Klavierspiel Op. 101 No. 23: Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0130c03bc92b1dac50b78ee09136fb13e170f9e7056a3058a4e7ebd31f097447. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/GBSMU9177395 — a six-check JSON result.
Vorschule im Klavierspiel Op. 101 No. 24: Kinderlied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23da392bede78cb97a7a036af8e98e7f9b9473f500f20fd95b3769f2c505462e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBSMU9177396 — a six-check JSON result.
Vorschule im Klavierspiel Op. 101 No. 25
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f6bc3b182442d6f7dee036483788610b726843d29b43833b8824e1bc96578d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBSMU9177397 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 Nos. 26-31
Vorschule im Klavierspiel, Op. 101 No. 26: Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bdd24c7b8e06797391a0fea39880ee46fb4f4330e6da615a4408ae261fdd15. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBSMU9297156 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 No. 27
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54295e05b22dec2061211d19f20ab0be5a00f667cc6794963fd86324d761029d. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/GBSMU9297157 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 No. 28
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65fdb1fde1495b0df679e18aaa87a2ab808baf0d5e06df7b09ca58c1753d3484. 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/GBSMU9297158 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 No. 29
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8edefe94bd04fc33e1cea3cee9273c7d686ebf8cd86b112a91c37c1858c74ec4. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/GBSMU9297159 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 No. 30
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a29dab6616df2f4a0e3c75a70d0dbb2f0318444213aed2782e220d10c17dcb6. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/GBSMU9297160 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 No. 31
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1ca4ea571f9a34e2d07c2a11fc3bb1fbf46440de000f1f27dd709874226a20. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GBSMU9297161 — a six-check JSON result.
Vorschule im Klavierspiel, Op. 101 Nos. 35-40
Vorschule im Klavierspiel Op. 101 No. 36
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55eeb134cd8b85c3b6b22543c7788201fb3e8965df9dfe7fe2256a573138165. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX3HH2168596 — a six-check JSON result.
Vorschule im Klavierspiel Op. 101 No. 37: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b84a508064e9f7c213b126701bbe7662397e983feb6724e2e812e40a6c03a3. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/GX3HH2168597 — a six-check JSON result.
Vorschule im Klavierspiel Op. 101 No. 38: Kinderlied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf996cb794bcfe771890c680d813593aa86cf8094c09bc76046b5eebae578fb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX3HH2168599 — a six-check JSON result.
Vorschule im Klavierspiel Op. 101 No. 39
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa2588f96773f51d74f56207d014626078caffa82b2b2053fb0327223baca6a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX3HH2168610 — a six-check JSON result.
Vorschule im Klavierspiel Op. 101 No. 40
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd5ca2e0d6e1749f38d8d09d7d84ab5e8e4bcc75fb264b1ba6052df7a8022d4. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX3HH2168616 — a six-check JSON result.