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 0x1f85c799332cbec17bb54112bb84c33afbaec50932a22a241e6c8d44a25193c4. 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/3d4c907c-eba4-4b16-860c-c9147c515935.json and https://artists.proofprofile.net/proofs/artist/3d4c907c-eba4-4b16-860c-c9147c515935.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Schumann: Violin Sonata No. 2 in D Minor, Op. 121 (Arr. Isserlis for Cello & Piano): III. Leise, einfach
A Golden Cello Decade, 1878-1888: Dvořák, R. Strauss, Bruch, Le Beau
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 0xcc66607ca5a12d2d1e22d87ea95d2991910dcd5d2461cf7f94038c5e617eabba. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBAJY2239401 — a six-check JSON result.
Cello Sonata in F Major, Op. 6 (1881 Original Version): I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d4a984570315c8c2a0b64ea54c3afff9caee7849622f52ecbf5c065a1ae1cf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAJY2239402 — a six-check JSON result.
Cello Sonata in F Major, Op. 6 (1881 Original Version): II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f0cdfc381b54efe8055d4747e42bee5a34fe0606cfff1bd130874b7083adba. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/GBAJY2239403 — a six-check JSON result.
Cello Sonata in F Major, Op. 6 (1881 Original Version): III. Finale. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebd095cdd39134376da1eed958bfb2291ca28be38f2b8bde5085a99e1c1dc7e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAJY2239404 — a six-check JSON result.
4 Romantic Pieces, Op. 75 (Transcr. Isserlis): No. 1, Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d91c682299276586993f6031db75219cc0ce7f3a487ee4b1f87d63df382f411. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAJY2239405 — a six-check JSON result.
4 Romantic Pieces, Op. 75 (Transcr. Isserlis): No. 2, Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab05b1fbeeb7c52cbd27a7ab75193435addc20e3131cfaaab71648cdd86d2c9f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBAJY2239406 — a six-check JSON result.
4 Romantic Pieces, Op. 75 (Transcr. Isserlis): No. 3, Allegro appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83fc169c9a63258908100e7934bd17f2ee5c6894998238ab474e8d9bef1c9d56. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBAJY2239407 — a six-check JSON result.
4 Romantic Pieces, Op. 75 (Transcr. Isserlis): No. 4, Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc125b92fab5a50e0870683343e1b4186acc5c8ba308003c24f05a941f6bd7f. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/GBAJY2239408 — a six-check JSON result.
Cello Sonata in D Major, Op. 17: I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa85657e65d25a71c251ca15cf048ede48e2cd8b1a6d616a4a6bc531b7e791a9. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/GBAJY2239409 — a six-check JSON result.
Cello Sonata in D Major, Op. 17: II. Andante tranquillo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12072c18fff1ca681b1f91e4d6078022d81c0568e3c2127a7258e7eab1a04791. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAJY2239410 — a six-check JSON result.
Cello Sonata in D Major, Op. 17: III. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3902fe634e88d07395216e36ecb3bbd0d50b988a9f08fa58c47675d3cba5dd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAJY2239411 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880418cd2dacebe5fef72ef0042d2966a2468a3687a792bfb3ea0fd2c95a839f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBAJY2239412 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dddd41d256316f4f765feee3e835c2ed18d34714c92ff58bfaca0ab846b77b0. 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/GBAJY2239413 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12072c18fff1ca681b1f91e4d6078022d81c0568e3c2127a7258e7eab1a04791. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAJY2239410 — a six-check JSON result.
Viola Sonata No. 1 in E-Flat Major, Op. 3, BI 325: II. Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d993acc5ac9a4f65ce2729e5e6596f57d37f287e78b5a5f208f462d775c91f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKI190940302 — a six-check JSON result.