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 0xb9de0076d661b8f113e8e6edb27b153cddb8115bedc99666e3400a01fdaa6b48. 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/a501ec26-0435-4e40-a10e-086d4988030f.json and https://artists.proofprofile.net/proofs/artist/a501ec26-0435-4e40-a10e-086d4988030f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schumann: Märchenerzählungen, Op. 132 - Bruch: 8 Stücke, Op. 83
8 Nocturnes, Op. 368: No. 1, Moderato e cantabile
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 0xdaedee66a30abf7ff4e424711815c908b01fc60540aee337fdaf22fcdaff0a1a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192341301.
8 Nocturnes, Op. 368: No. 2, Andantino animato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85600e634ef414a7794de0c21d7a55273bfb120d8895d6d5fc03946257e5792b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192341302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad1754ee388f0c480f835b57282425a8bf9a7a23470d15dd1bf61a3bb881883. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192341303.
8 Nocturnes, Op. 368: No. 4, Andante grazioso e con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6e13b0ecb64dc4570d5b4655db232fe430324e5815d299a3ab79e7cede1e96. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192341304.
8 Nocturnes, Op. 368: No. 5, Allegretto grazioso e con anima
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a4911852dbe3624b9cb1ccb9be686e63fa0c2b24ee347160b8c6500f219d2e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192341305.
8 Nocturnes, Op. 368: No. 6, Andante maesto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1999ebb8f06f695c6f48017ec1a535443b4702e954e8cf6fa7e0c0c2a4f6e37. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192341306.
8 Nocturnes, Op. 368: No. 8, Allegretto con anima
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b9f08449828054899fca9ab72e1cd198f7a056a00787b129350f3ab6d91275. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192341308.