thumb|upright|Ortner in 2009 Erwin Ortner (born 15 December 1947, in Vienna) is an Austrian conductor, especially of vocal music. He is the founder and artistic director of the Arnold Schoenberg Chor.
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 0x89ce6e4ad6891e8242a2c2e73270b130a187b83b622f031130db136ce4662f04. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f0870317-d905-4348-aa7f-b6219d33209e.json and https://artists.proofprofile.net/proofs/artist/f0870317-d905-4348-aa7f-b6219d33209e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Die Zauberflöte, K. 620, Act I: No. 8, Finale: a-c. Zum Ziele führt dich diese Bahn
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 0x75f1fefabd06d81a3d9382a52e857cf737ba3c90172571d14f13ee0c64ef777b. 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/DEN960532513.
Die Zauberflöte, K. 620, Act I: No. 8, Finale: e-f. Schnelle Füße, rascher Mut
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecee34f5d117ba6a9f3e018b1a7bc84bdb4e7649a66f7ba92cdbc08e7c60888. 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/DEN960532515.
Die Zauberflöte, K. 620, Act II: No. 10, O Isis und Osiris
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd64fba30c07774c5e53157b158f9b3e7fc8ae29b651aba8e4c1fb570b7f32541. 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/DEN960532519.
Die Zauberflöte, K. 620, Act II: No. 21, Finale: h-i. Nur stille, stille - Die Strahlen der Sonne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4dbb0db15add3cc60341d3db685581d2129331c00ab1d138cd745c49bdc352. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960532542.
Die Zauberflöte, K. 620, Act I: No. 8, Finale: g-j. Es lebe Sarastro!... Wenn Tugend und Gerechtigkeit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc431445de3651309c3a91bf817909d2e086269a1ba86fea10e3580005bb9c412. 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/DEN960532516.
Requiem für Mignon, Op. 98b: I. Langsam feierlich
Schubert: Mass In G Major, D. 167; Tantum Ergo In E Flat Major, D. 962; The 23. Psalm In A Flat Major, D. 706, Op. Posth. 132 / Schumann: Requiem For Mignon, Op. 98b
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaac0ae626a6b79abc015d596359f5aab55d9d3fe4b99d99285838829c393184. 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/DEF059004501.
Requiem für Mignon, Op. 98b: III. Lebhaft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb584cf701de8903e78418e3d91e127dc06ceadc6998b43e7d90c417cdff12145. 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/DEF059004503.
Requiem für Mignon, Op. 98b: IV. Feierlich, doch nicht zu langsam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10b3c3c1ba333033d0f57d9c13b63198149efe7bf6b87a9561e48eeba39bb25. 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/DEF059004504.
Requiem für Mignon, Op. 98b: V. Die Viertel wie vorher die Halben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50065cca798e48fd5d0aa129edf4a67c9979baa05601f2d6112916c037c67ab. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/DEF059004505.
Requiem für Mignon, Op. 98b: VI. Lebhaft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73156bb807bcc4dde5c9b253fa3ce617adb6b270eb9de7c58326f5ac9430f46. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/DEF059004506.