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 0xaa2adbeac00c002b32de87ceedde1950b467298af3bff2462a4d5444af38f1df. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21dff25e-c6c2-45aa-8653-b4dcd9098127.json and https://artists.proofprofile.net/proofs/artist/21dff25e-c6c2-45aa-8653-b4dcd9098127.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Jürg Dähler · Viola Concertos / Signatures of Life – LIVE!
Ode an die Freude - die 9. Sinfonie / Europa Hymne (Ode to Joy - Beethoven's Symphony No. 9)
Klassik die man kennen muss! Die größten Werke der Klassischen Musik
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 0x561a857202fc377f6c6e9e434fa1b32789094282b2e1590086650236be00dd7d. 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/DEP621800012 — a six-check JSON result.
Missa pro defuncto Archiepiscopo Sigismundo, MH 154: Requiem aeternam
Michael Haydn: Requiem, Symphonies P9 & 16
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e149c83f164cd3376f8d9db8833369be56426f57291d73c8189d39517fecec0. 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/DEA140424501 — a six-check JSON result.
Missa pro defuncto Archiepiscopo Sigismundo, MH 154: Dies Irae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce11fcf897bfb3a4e750a48a62b9077ecc51fa92bc30059d41e2450aadce274. 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/DEA140424502 — a six-check JSON result.
Missa pro defuncto Archiepiscopo Sigismundo, MH 154: Domine Jesu Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235fafbe574240918e9dc816f0ee7afba0ed8a7d33c460fce1d8db558dcbc1b5. 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/DEA140424503 — a six-check JSON result.