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 0xd8a132d0c4d991872ef80844a889a21e45d387b8cd9d9ca96b4143d849035834. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf523b31-4af6-4e7a-9a11-f10922ee0d19.json and https://artists.proofprofile.net/proofs/artist/cf523b31-4af6-4e7a-9a11-f10922ee0d19.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Die Zauberflöte, K. 620 / Erster Aufzug: "Wie stark ist nicht dein Zauberton"
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 0xdb969255366c496beb020d848d8b1d9015222289b50588ab4e6fed58e252bceb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056430627 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51033449a251d60fb08f74c26c1b2e6ec81021347ba8059d2fcbdaad663fcedc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF066506640 — a six-check JSON result.
Verdi: La traviata - Highlights (Sung in German)
Fritz Wunderlich - Und es blitzten die Sterne
Tosca / Act 3: "Und es blitzten die Sterne"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db0dddd09c32325a54ffa4cec4860099c6111cd52117da91efd7286e93d822a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056102720 — a six-check JSON result.
Die Zauberflöte, K. 620 / Erster Aufzug: "Zum Ziele führt dich diese Bahn"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd2f6261685e41ef38bdbabdf8eeae0cdbf21ef5d3845d480e0b649a720793a. 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/DEF056430626 — a six-check JSON result.
Die Zauberflöte, K. 620 / Zweiter Aufzug: "Tamino mein! O welch ein Glück!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33e9994317506ba98b7c4ec46ae5735a81ebf782c4a10d780025c0b516f945d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056430647 — a six-check JSON result.
Kienzl: Der Evangelimann, Op.45 (Highlights)
Fritz Wunderlich - The 50 Greatest Tracks
Die Zauberflöte, K. 620, Act I: No. 3, Dies Bildnis ist bezaubernd schön
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a5d91ad6344c5e9027153f2e3865c629d0f332951bfe978f774e0d49978d34. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056430604 — a six-check JSON result.
Don Giovanni, K. 527 / Act II: Recit. Amici miei – No. 21, Il mio tesoro intanto - Excerpt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd92700bd821e9a0fe68d36290381571f4b4648ebd11f2e80af3204cb8a3125e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056309063 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65abef471f8f25f423e2c7cccbca06adf3bc2ce86ee0d49f8e65f5635b01fd90. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA561010595 — a six-check JSON result.
Dichterliebe, Op. 48: I. Im wunderschönen Monat Mai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a743935eb8b88cb4de2f257eb28e009b17296695e6b8024e6466104858925e5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056530801 — a six-check JSON result.
Pfitzner: Von deutscher Seele / Schoeck: Lebendig begraben
Lortzing: Zar und Zimmermann - Highlights
Zar und Zimmermann, LoWV 38: "O sancta justitia!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe058e216a917c6206a3d32e38b98d46ee9526fca013ea9dee90928e7d6688b50. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/DEF056630904 — a six-check JSON result.
Zar und Zimmermann, LoWV 38: Ballett (Holzschuhtanz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9fd865220f3dc1e53119005d7b1661bae32668b0a3c482527a32a2716edc44. 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/DEF056630910 — a six-check JSON result.
Lehár: Die lustige Witwe, Schön ist die Welt
Mendelssohn: A Midsummer Night's Dream, The Hebrides
Berlioz: Requiem, Op.5 (Grande Messe des Morts)
Berlioz: Requiem Op.5 "Messe Des Morts"; Harold En Italie, Op.16