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 0x139dd2faad0764d3337b43b13262aeda48ddd7f7843d9a8cc11baf497c160a51. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52361df0-38f0-4a73-a724-928590198666.json and https://artists.proofprofile.net/proofs/artist/52361df0-38f0-4a73-a724-928590198666.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Trio in B-Flat Major, Op. 11 "Gassenhauer": I. Allegro con brio
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 0x27a4d44607822bd6e697b93282fcede13c87fa714d6e73d38b4598a903de2e03. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200038.
Piano Trio in B-Flat Major, Op. 11 "Gassenhauer": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153fc56d58ee7f33260f14e42a3d23ce9657b17d2158c8e8fec8233934ac2d96. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200070.
Piano Trio in B-Flat Major, Op. 11 "Gassenhauer": III. Tema con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc534689e9255b6648511d94628640bbda03898f9a80b4ffde8e221c6e4aa17a8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691816afb2fe85590fe679039dfaa2b95dbb25b09f9dac94eabcab6c4629bfc9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200039.
Trio in E-Flat Major, Op. 38 (after the Septet, Op. 20): I. Adagio - Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66e76400b1794694f5fe04df0011bdf7e3e14eb64bd585cf086a6cdc145d76e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200040.
Trio in E-Flat Major, Op. 38 (after the Septet, Op. 20): II. Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028abf3e1e16b5952fa8f05b4b39ac4d3b8ee97634352adc809a84a0bc729d30. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200105.
Trio in E-Flat Major, Op. 38 (after the Septet, Op. 20): III. Tempo di menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0236effb23a96048c2bc104b8773e82fb760b7ebad39c1f319318db2c0a5af. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ATUM72200106.
Clarinet Trio in A Minor, Op. 114: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420ec19583f2d580dfe9f48a30b24c31ca63a70fd110d982c1d0419576b0ef8a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200041.
Clarinet Trio in A Minor, Op. 114: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73f084e0000df599e95364536be9eaa35f5b8ce02992c77d05f701837797b0f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ATUM72200072.
Serenade in F Minor for Clarinet, Cello and Piano, Op. 73
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3e5b62a0bbf8e74fb69f2e79fa566b07211c8a34b4b898f0cca4f0193e30aa. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200042.
Clarinet Trio in D Minor, Op. 3: I. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa8cd024483ac1afd0003792994a0b952326cb299245badbe82a92994660879. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ATUM72200046.
Clarinet Trio in A Minor, Op. 40: I. Mässig schnell
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dbc2c55a6f04d6617a4c8bc42db62c9413dcc26d5e1dee99db6735377ac8387. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200048.
Clarinet Trio in A Minor, Op. 40: II. Anmutig bewegt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672f8af661930e6362f0a1483d70c03b34436ca49f134cd0e8ef3947a758c79c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200111.
Piano Trio in D Minor, Op. 120: I. Allegro, ma non troppo (Version for Clarinet, Cello and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4716e30bbf22526995bd36af48e5c33494a4675d9b69c611de6097b72dcd2fc4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATUM72200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e505ba84be1025d82ad235f604171b8a8cd6bcc6b0630a110f28296c78892a. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/ATB152300243.