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 0xb9fc4635ba04773cba7aaba6ca43916bd31cc26500193876d9e06f61833379af. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b1c4119-e1c2-4175-8610-2cc2210e13ac.json and https://artists.proofprofile.net/proofs/artist/9b1c4119-e1c2-4175-8610-2cc2210e13ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tannhäuser, WWV 70, Act I: Wer ist der dort in brünstigem Gebete? (Landgraf, Walther, Biterolf, Wolfram, Heinrich, Reinmar, Tannhäuser)
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 0x3b3f80edb2a83fd6111e67cebe4b1261249e5d63f4885d67962011436d7bce9c. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/NLE421200109.
Tannhäuser, WWV 70, Act II: Auch ich darf mich so glücklich nennen (Tannhäuser, Walther)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e82973252e21c9ac546e7d1ee987d450e944cf18a31cfc180747698d8ee3f94. 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/NLE421200118.
Tannhäuser, WWV 70, Act II: Versammelt sind aus meinen Landen (Landgraf, Walther, Heinrich, Wolfram, Biterolf, Reinmar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa0ece7ee33315797b0715857dea78029afaa5d8a017577424cba954d8159e5. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLE421200125.
Tannhäuser, WWV 70, Act III: Heil! Heil! Der Gnade Wunder Heil! (Walther, Heinrich, Wolfram, Biterolf, Reinmar, Landgraf)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb99793d7e537b442191dedf0f366c0506d31227f2787b383d69c0bf012a497. 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/NLE421200137.