Klaus Lang (born 26 April 1971 in Graz) is an Austrian composer, concert organist, improviser, and academic teacher. His opera Die Architektur des Regens (The Architecture of Rain) after the Noh play
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 0x643deee1c2061ac83f010a7c58e47b9a9241772eb71773d58563001592c837ec. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca95addb-6e70-470b-aa81-cdc5a79cf44a.json and https://artists.proofprofile.net/proofs/artist/ca95addb-6e70-470b-aa81-cdc5a79cf44a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Klaus Lang: 3 Goldene Tiger, Der fette Hirte und das weiße Kaninchen, The Book of Serenity & Die goldenen Tiere
Salome, Op. 54 / Scene 1: "Nach mir wird Einer kommen"
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 0xb33f61ff9b461a55b7eeeae40003655fe3d5910d8688bd5fbcd597c284ecd4d4. 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/DEF059030303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85550a438a6d42abaa3792234d8914091312a9dc5606fad4ed03721e7021889. 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/DEB161000308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb7f30e99c0a048639fa806d8bcacc90780ce8e91f0b44785d0365ef36d0478. 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/DEB161000309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfbc855875e798e2fa1b0bae072e9787070f12777b8d45e86d159502405dd8c. 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/DEB161000310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7faeb41f33dc681d1096d8182e2241a5cad7a75203eacc31bb0cf194e11c404e. 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/DEB161000312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc1c4bc5d1aa2208e0ccbfac1bc6e7c9e76ef96914b77228e331a67a7cdce8c. 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/DEB161000313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15caf41032c57aa292aa5fddebcaa770dde68d50428173588c93f2334a36f48c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEB161000315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3bb826c2ddced9ea2ab0691d08dbb1e50ff710a30cc489e735a95c9c1da465. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/DEB161000301.
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 0x62e1813edbb43feb8692b8749583792bfa7ef47f9ee1713d36fa607f32c131f4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB161000302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad0f7a8638a6d56a8923f87390470ad68fc028fe173088d1f89ae296650c0db. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEB161000303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20136e583501297f9144099cd7d9bf8528e2b8143373560d91646b02f8624634. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/DEB161000304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8c5818af545befd78a3f4cd16e542c349a83809375953a30ddf69678cacd31. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/DEB161000305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ed4b3deb44ac582eb2492cf3984a71cd5615e1d4159b7bb28c6a01be7fe1ab. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/DEB161000306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481c763fa8dd490d7be7682e3cb19485e27e0ac4facf9e40d48fedbbcd42e26d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DEB161000307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d2a3d96b382d20e4b2496b7ef23f00915f568c1148c1366b9d57f0556faad9. 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/DEB161000311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa006290fc1d0091aa1e79ad4a32a5ccebfc52958fbd036bb71d82d6a5fc61659. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEB161000314.