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 0xdf4d85c330818d68fb11eebcc5691c087193d02b29531366434f13aa165e5c16. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dcbed683-eb9b-4812-8c9a-2ba0f8d27423.json and https://artists.proofprofile.net/proofs/artist/dcbed683-eb9b-4812-8c9a-2ba0f8d27423.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Stolzel: 6 Pentecost Cantatas (Pentecost 1737)
Bernhard Lang: Das Theater der Wiederholungen
Wozzeck, Op. 7, Act I: Langsam, Wozzeck, langsam!
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 0x5e51f193ba7c6dc567e100c774aa69a5836e51db99c3cecf0d84b2fc500807b3. 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/DEU921897401.
Wozzeck, Op. 7, Act I: Du, der Platz ist verflucht!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0cc787ff11c9bb8e39923df86679dc9ef2490f43d12158d5eca12a671d1e201. 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/DEU921897402.
Wozzeck, Op. 7, Act II: Wachstube in der Kaserne - Oh-oh-Andres! Ich kann nicht schlafen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae7e34f2e0d4bc86f5333a99bc778e41c4997c52409da9462293be58db80995. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEU921897410.
Wozzeck, Op. 7, Act III: Schenke - Tanzt Alle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa832464bf5a9f57a6bea560c018fee54bbddcc892220564487b0e486a618ffbd. 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/DEU921897413.
Wozzeck, Op. 7, Act III: Das Messer? Wo ist das Messer?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6ac34ecc0c985f39df2b3fb9be612758b08a4144af9c2ba8ff247a6d0d9217. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEU921897414.
Wozzeck, Op. 7, Act II: Wirtshausgarten - Ich hab' ein Hemdlein an
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa335fe38699b35b729b913b76f7cb562df4c54dbbb598e82ff9d77e9238d3d90. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEU921897409.
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