right|thumb|Portrait of Walther von der Vogelweide from the Codex Manesse (Folio 124r) Walther von der Vogelweide (; ) was a Minnesänger who composed and performed love-songs and political songs (Spr
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819a563a78da340621bebed14009d4d16630c7525d4e5d87545aff8a138d3eb6. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/beb05ed6-1045-4576-9be1-46d86036b570.json and https://artists.proofprofile.net/proofs/artist/beb05ed6-1045-4576-9be1-46d86036b570.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ich saz ûf einem steine (Arr. by Marc Lewon)
Vocal Music (Medieval) - Walther Von Der Vogelweide / Oswald Von Wolkenstein / Codax (Songs of Women in the Middle Ages)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c94b89564f340e98ef793d926013b1ba9a44e13926370a46bf83ad717703e3. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB909000201.
Nu alrest leb ich mir werde, "Palastinalied"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ded25923e5d4018f67593571a2cdc047f38f5f9e770d509a5984320c2470964. 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/DEB900101309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e7a0799d2c2a21445a6b46650969205ae09844b150051a80ec0d70e31b5802. 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/HKI199628201.
Thibaut De Champagne: Seignor, Sachies, Qui or Ne S'En Ira / Guiot De Dijon: Chanterai Por Mon Corage (Crusaders)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2455e41ba637fefb33ee78587ff1c69ca6ab3b30c7f3392420a075a3e1221a12. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEB909600911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d120f724e62b9eec7499fbe3173522602ddd15b7f38e05ea8bdd30b4d6797e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBF077040708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c9dbeb283a1b260b3d2efc8ca09b8f818e84b09f539eaa1781a5157b67f7b6. 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/HKI199930605.
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
Palaestinalied / Allemande Tripla / Mit Ganczem Willem / Tanz Wascha Mesa / Judentanz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e11aa9977cffd591f6d1a2c4bb6bfe8e0c69b871a9eebdf42e03f90255784ae. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ES5151702587.
Palästinalied (Arr. for Soprano, Violin and Orchestra by Michi Wiancko)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fdca486178417abc4574c1f87a237b77ff3546634049bd7ebdfb6b1ebe260d6. 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/FR50X2073902.
Alfonso X: Cantiga No. 109 / Bernger Von Horheim: Nu Enbeiz Ich Doch Des Trankes Nie / Vaqueiras, R.: Kalenda Maya (Codex Manesse) (I Ciarlatani)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02700fad1a07afb2de0d2f9434fac5d18589db465ef6f7631042de9e217c9f0f. 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/DEB909600508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947ae8859d067ebee363be8d4abe8bacfd2439445416b25a1613481fd273322b. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEB900101308.
Moyen Age: Musique instrumentale du moyen âge (Instrumental music of the Middle Ages)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f80fc631124d2199ae3d11a171fe1ef8f2b5f700c73a19e95c5ad6bdf7d4ef. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/CH1409807132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc940c0c6c4562c8c26c9b88604e1aabfc768b51c4aa2ce5e7acac2ff69a22a. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/BER182244711.
Trouvères et Troubadours : Aux origines de la chanson
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fecd0dba6242235cf554b7bcd2212ace56dcd09b41910fab32a1d755c496883. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ092400191.