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 0x24429f9398929e15445d4dcdee63d243b2800053def09a1eb4f6ad880005be8f. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a91d0230-cabf-4f98-b9e4-7fb659675752.json and https://artists.proofprofile.net/proofs/artist/a91d0230-cabf-4f98-b9e4-7fb659675752.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
9 Deutsche Arien: No. 1, Künft'ger Zeiten eitler Kummer, HWV 202
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 0xbf7282b158c235d9af9f67b8c3c34912587a602d30036db3016305b1e6f3eff7. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DECP61608001.
9 Deutsche Arien: No. 7, Die ihr aus dunklen Grüften, HWV 208
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021ead57bc2320e994c8d3b59e2ce890ec5657f5f0928bb62203fe6432ee8f8a. 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/DECP61608002.
9 Deutsche Arien: No. 5, Singe, Seele, Gott zum Preise, HWV 206
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3edd6462d8c78f93baf7c05b3672fc57d2d4859fb8563f7e39dbbf927a2b039. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DECP61608003.
9 Deutsche Arien: No. 6, Meine Seele hört im Sehen, HWV 207
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba44a9f5c6848b43ed38073d6dfa5e47191fd7748c8095ecd18fd318858d47c9. 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/DECP61608008.
9 Deutsche Arien: No. 3, Süsser Blumen Ambraflocken, HWV 204
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499300cbbb1891af399ba1428f0acc4c795a5aaacec1fd13b13aa10b3d867b50. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DECP61608009.
9 Deutsche Arien: No. 4, Süsse Stille, sanfter Quelle, HWV 205
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8121c8d80dd05126261c50a23dac661d79634828b575b5246adba2e16906f819. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DECP61608016.