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 0x589cf3eed81df7360973fafc5c4c9b2096c1fcba3b978d07831675db47bb5c9a. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/47cd78f9-ec98-4f20-859b-6221e4ef39e4.json and https://artists.proofprofile.net/proofs/artist/47cd78f9-ec98-4f20-859b-6221e4ef39e4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Von Herzogenberg: Piano Trios, Op. 24 und 36
Beethoven: Piano Trios, Op. 1, No. 3 u. Op. 97
Beethoven: Piano Trios Opus 1, Nos. 2 & 3
Piano Trio in G Major, Op. 1 No. 2: II. Largo con espressione
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 0xe9495139d2698fc166918c3e116f2a937b10778befdd9ee64fc78abc0e51a28b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBAJU9800632 — a six-check JSON result.
Mozart: Piano Trios K. 502, K. 542 & K. 548
Piano Trio in B-Flat Major, K. 502: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2547a8c482fe654b929b605bcd24556bdd79bafc48817403b8b4abeaadf4945. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBAJU9900001 — a six-check JSON result.
Piano Trio in G Major "Gypsy", Hob. XV:25: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd32d61eebebdefda692e48514cb4ad83d368e1d79c12064f66149baa2eee815. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBAJU9700094 — a six-check JSON result.
Piano Trio in G Major "Gypsy", Hob. XV:25: II. Poco Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de21f4e28ae991e6fbd729aa1b128c456c8f96508e42c87060099923e8235b6. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/GBAJU9700095 — a six-check JSON result.
Piano Trio in G Major "Gypsy", Hob. XV:25: III. Finale. Rondo all' Ongarese. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dcafff1228ba1d7be3899df11d2ab2ef556a9c1aecf425ef71dd2bdca4dc1fe. 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/GBAJU9700096 — a six-check JSON result.
Piano Trio in E-Flat Major, Hob. XV:29: I. Poco Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb3e87b8056072b88f1ad8bb378fc7c43fa4b8d4843f4df2296764cd56ee37b. 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/GBAJU9700097 — a six-check JSON result.
Piano Trio in E-Flat Major, Hob. XV:29: II. Andantino ed innocentemente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4456f7bc35f3b33c210e4af48980309366c1e975603ee0fb3d595b00a6d469a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBAJU9700098 — a six-check JSON result.
Piano Trio in E-Flat Major, Hob. XV:29: III. Finale. Allemande - Presto assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8fd3ab3c53f3c4cb5d92fc45247e2ee0bef2871aa7f2ff24c0899a2d0e4c419. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBAJU9700099 — a six-check JSON result.
Piano Trio in A Major, Hob. XV:18: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a08d3cf5c2afbef74a77d0ab34fd63bfcce045b6004640a445cc0af71df8db. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBAJU9700100 — a six-check JSON result.
Piano Trio in A Major, Hob. XV:18: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb734e51d7fa03a5672a226f96e9a9c96401d2071a6fbfda4cf01664ca98a8720. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBAJU9700101 — a six-check JSON result.
Piano Trio in A Major, Hob. XV:18: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdce333d38a5a7ad8decf5646fb8e43e6651a49137755234b7e65d6e6080043. 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/GBAJU9700102 — a six-check JSON result.
Piano Trio in D Major, Hob. XV:24: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85aa3be38f20399cf72908e3d81a5e8decfacf63d839e2af60036beba8421b2. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/GBAJU9700103 — a six-check JSON result.
Piano Trio in D Major, Hob. XV:24: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9a13c80b655eb8b06c68d880c198db078fa6f56125856fd4a4c103a637c1b7. 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/GBAJU9700104 — a six-check JSON result.
Piano Trio in D Major, Hob. XV:24: III. Allegro, ma dolce
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532df392be8299bbfe5426fc588be64a68d9ff16b5bb853f13e31932ef85a4f9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBAJU9700105 — a six-check JSON result.
Brahms: Piano Trio No. 3 / Trio in A Major