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 0xcef548121a5135085262167cedd3b37bf5c91e74b373cd71e2700cfb15b974ce. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bee35404-08c5-4dc0-9595-88ea978612ba.json and https://artists.proofprofile.net/proofs/artist/bee35404-08c5-4dc0-9595-88ea978612ba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Preludes Op. 28 No. 1 In C Major Agitato
"11 Bagatelles, Op. 119" and other works
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 0x03cbb4970d417610974a1d89ac0024344c5c4c5f3ede3ea2cd71056284d730eb. 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/KRUM71100139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9202b50b271904c8092e1af16a576bbee177db0c7a381ff98b144b62787693. 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/KRUM71100140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7115fc99dae0d80fe96eec4b1ace741b7512f25808b9926b4b40cbf8b87a4df5. 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/KRUM71100141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d057e0c49352c0ea53de8c1f11da0273d29ff5a4a90b24bd9a6f9e6a2c5f8ef. 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/KRUM71100142.
Preludes Op. 28 No. 5 In D Major Allegro Molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7d4e0c1e8c793615ad5f668b3238f8b10c5e318f861a7330317b3a965dcf19. 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/KRUM71100143.
Preludes Op. 28 No. 6 In B Minor Lento Assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe22cc63457767be488cd3b111bfda85fc262608b0e6b10d8baa5bbd9f1b63ac. 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/KRUM71100144.
Preludes Op. 28 No. 7 In A Major Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4789c67867393f3b076914dd2e23c28e672714b4a99d2b108da35b16b2ffa6d1. 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/KRUM71100145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4984781f71a5139ca9afa1b32b3d79d0dd6095ccf10809cdabb13c39c5b86a9c. 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/KRUM71100146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e68d7e0ae40cbab487494946ce8667aabee079fb82635fdfe74e89c2c2664c. 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/KRUM71100147.
Preludes Op. 28 No. 10 In C Sharp Minor Allegro Molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893bf0cbe1154a01c1be18f8ff11751dd5a94051f998b61f0b6f12c5290f3e64. 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/KRUM71100148.
Preludes Op. 28 No. 11 In B Major Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da47e677449c7c46f5a1bfb7f1f77dcd54208f67f4073f6db26e19793de24b5. 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/KRUM71100149.
Preludes Op. 28 No. 12 In G Sharp Minor Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69edb98a9d4b0901d81a990e417e7ed648f9142694e994d2dea51d079aa9bec8. 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/KRUM71100150.
Preludes Op. 28 No. 13 In F Sharp Major Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6df09bf18a22076bb2dce1705daf3e6e64cbb11b2d224af31cf3f61c5f88d9. 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/KRUM71100151.
Preludes Op. 28 No. 15 In D Flat Major Sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a30d0ad560501a6a229af26ca13dda01210a5fdddd56fc45879386482bd1579. 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/KRUM71100153.
Preludes Op. 28 No. 16 In B Flat Minor Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5fc05d6a69accd00ca4a2812cd066eefa15e217966cff18fbba766262dde3c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/KRUM71100154.
Preludes Op. 28 No. 17 In A Flat Major Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1ddbb038a71dd4a6219a249ec4d3f01ffc2df4b805727e69dcbd24e41aaeb7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/KRUM71100155.
Preludes Op. 28 No. 18 In F Minor Allegro Molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb09abc06bb7fdf3044002501978e7d158d2cc9aba57dd204cbb0547dd20f42c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/KRUM71100156.
Preludes Op. 28 No. 19 In E Flat Major Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c23577372f696571adc441a3a45601f398a6df86a421eed13d72d3001133ace. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/KRUM71100157.