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 0xf5698e5988f1562ec2c7411fb0892651a6f260d6d6189c47836656f549ea1f44. 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/cf2cdca3-7560-4030-8a58-a397ed4755cf.json and https://artists.proofprofile.net/proofs/artist/cf2cdca3-7560-4030-8a58-a397ed4755cf.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Violin Recital: Koljonen, Elissa Lee - Chopin, F. / Elgar, E. / Rachmaninov, S. / Kreisler, F. / Liszt, F. (Heartbreak - Romantic Encores for Violin)
Nocturne No. 20 in C-Sharp Minor, Op. posth. (arr. N. Milstein)
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 0x6e4a3f53b65c75e912be9a912a8f741485c6c43cb739dc392791f132c646f17a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USB8U1032096 — a six-check JSON result.
Salut d'amour, Op. 12, "Liebesgruss" (version for violin and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e2077927c826d25a07c1396f73871a5f9379aba1e7d1f536bf127b7ffe5fa6. 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/USB8U1032097 — a six-check JSON result.
14 Songs, Op. 34: No. 14. Vocalise (arr. M. Press)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407e0979a17c3677623cf4c796139ddd2dd9d05f47aa6f19a46f0a6a7bc42d3f. 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/USB8U1032098 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e1c11f7fbe415e5536b5aa513eed3bc5ed2b4dc0793cd08f8ba16ca2ad3c80. 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/USB8U1032099 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df16e01d79b31ae5b1ca911d8d93c4433abd5ba517395db82351cd4d61592ec. 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/USB8U1032100 — a six-check JSON result.
Consolations, S172/R12: No. 3 in D-Flat Major: Lento placido (arr. N. Milstein)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe250945b868c4ecf4747a31aa2c44ef7fda67ae3112bb1d6ad448518fa5c6fff. 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/USB8U1032101 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb0d7d3f77177621e44e80d22a0e537a819047e752fff5426c88aaf8f3169e9. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USB8U1032102 — a six-check JSON result.
Thais, Act II: Meditation (arr. M. P. Marsick)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894306956ce759095aea80b536cf07e49ce9dcb5397a399de82a183cf3f731eb. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USB8U1032103 — a six-check JSON result.
6 Morceaux, Op. 51: No. 6. Valse sentimentale (arr. M. Press)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2749e218b245a90a1c190f667a4f2b8661ed5bd5634126caa553845e2a125445. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1032104 — a six-check JSON result.
Nocturne No. 8 in D-Flat Major, Op. 27, No. 2 (arr. A. Wilhelmj)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911e1eba0ddb93ed07550bdb679623852fb4b4fe5ac5c1ae9dfd73a636128a54. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/USB8U1032105 — a six-check JSON result.
Pavane pour une infante defunte (arr. P. Kochanski)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6ecc6f7b8855e9a535d9dfed19bba92501bbbfc8f311eb0cb2130342a19536. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USB8U1032106 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d2956b2f44d6c855690cec649640296ded78c765820e41127ffca49e290729. 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/USB8U1032107 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae07cbf14d16a85f662f83b84b1ab3598756bd60c867446846ca27c01cf5f74. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USB8U1032108 — a six-check JSON result.
Gianni Schicchi: O mio babbino caro (arr. E.L. Koljonen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18c831903fda35f12aadc6580273637b1db2dcdb549db62ad66edac917cc12c. 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/USB8U1032109 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68487eb3cf8eb14878b130fb8a0cfa54b6d17c8c2cf74760d1bcdbefc6b6d478. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1032110 — a six-check JSON result.
Zigeunerweisen, Op. 20: I. Moderato - Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672f2aa8f0116be5a08f7a1923ceb7d49884183e94cf988fc06cf5a54bc276ec. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/USB8U1032111 — a six-check JSON result.
Contemplation (after J. Brahms' 5 Lieder, Op. 105)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512647b2169865f43a61f385c1c388da50a7a2a9e4287703ecbfe2271876b1f0. 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/USB8U1032112 — a six-check JSON result.