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 0xb5c0900c60771112e2aa92ca6882c5b3876ea7fff99290e815eb00b722bc372b. 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/310fb835-46ec-4998-80dd-fa59d4854bd3.json and https://artists.proofprofile.net/proofs/artist/310fb835-46ec-4998-80dd-fa59d4854bd3.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Carl Czerny, The School of Velocity, Op. 299 Book 1 (At tempo and half speed versions for practising)
Carl Czerny, Practical Exercises for Beginners, Op. 599, Volume 1 (First exercises for the knowledge of the notes) [Remastered]
Czerny Op. 599 Exercise No. 1 - Remastered
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 0x0bcc8f9ded1ec03242b7b0596fe0b079530d2bc6b5eee148395f26567ced79c8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367723 — a six-check JSON result.
Czerny Op. 599 Exercise No. 1 (No repeat) - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aad4112245f6b2547b571de4240c68efea4d6b0c44aae4e2115a4e8a24784ae. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367724 — a six-check JSON result.
Czerny Op. 599 Exercise No. 2 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21b9ae011247a5de7886405b58c93532566609d4015e003e17f021dabc67104. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367725 — a six-check JSON result.
Czerny Op. 599 Exercise No. 2 (No repeat) - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe728998ef51998533a0add84750d5bc5364deebfeca88d3d1a979d1f901126c4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367726 — a six-check JSON result.
Czerny Op. 599 Exercise No. 3 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc0a8ff45811f2073bbe566eefcb4a86a0600bb501c7f6dcbc9716aed04810f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367728 — a six-check JSON result.
Czerny Op. 599 Exercise No. 3 (No repeat) - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44587345af096e04d28a9d0641e698528ee819697de1b1529f2beda84fb04395. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367729 — a six-check JSON result.
Czerny Op. 599 Exercise No. 4 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994cd87bebf6ee1fd8bfae7604758fdf2f3d9dd74caa1e4b3a079bb2db3b560e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367730 — a six-check JSON result.
Czerny Op. 599 Exercise No. 4 (No repeat) - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0bd3f337933eb781d535726aa10e3a280009b7a205ac2907487d6589711fd2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367731 — a six-check JSON result.
Czerny Op. 599 Exercise No. 5 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d586132eb5093510a3c8098902cd56ec88e8e3fcdb0fc04475b3fc907a039c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367732 — a six-check JSON result.
Czerny Op. 599 Exercise No. 5 (No repeat) - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f715dbf7cccbef1019d17eb550265ab5f495075538282fd8d5e57e15a578e6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367733 — a six-check JSON result.
Czerny Op. 599 Exercise No. 6 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d288ac4d3ab043987bc2645812b1bcab45240f8ec42b7c9c7f8dfde5fdd1635. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367734 — a six-check JSON result.
Czerny Op. 599 Exercise No. 6 (No repeat) - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf792176a14c3e8e7ad6b64b548ec9424ce5a1b35e187e84f94a20a43eadbfd68. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367735 — a six-check JSON result.
Czerny Op. 599 Exercise No. 7 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4f3ff8894462e74b22142202ff403c9aebf3464133eccfd6916bcd32b72660. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367736 — a six-check JSON result.
Czerny Op. 599 Exercise No. 8 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3776bb5ba7b3ca966c8ca6c22cfed0f259680f37fc34beaa4c1c0b7bb7d1d257. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367737 — a six-check JSON result.
Czerny Op. 599 Exercise No. 9 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc477b41232f3172a40616e55973a0979ad34517a491e7c0ff21d9bc03071ddf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367738 — a six-check JSON result.
Czerny Op. 599 Exercise No. 10 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461a1365e865d64d187b7d11c3073c7c310063d6246e7915abb354160c107853. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62367739 — a six-check JSON result.
Bonus Track: Mozart’s Variations on “Twinkle Twinkle Little Star”, K. 265 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911acf4d8e36da3403f9b884965309e7ff2174cf84fccab1b0c5b1fb973967b2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA82314896 — a six-check JSON result.