Kurt Julian Weill (; ; March 2, 1900April 3, 1950) was a German-born American composerThe editors of Encyclopædia Britannica. active from the 1920s in his native country, and in his later years in th
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 0xfb7d3c408b19ab54746184b309c5e453234bc22c61ddbce2aa862faf8b0a6cd6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5743f41e-6b33-4e6c-a823-63f35ccd44b9.json and https://artists.proofprofile.net/proofs/artist/5743f41e-6b33-4e6c-a823-63f35ccd44b9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kurt Weill: Symphony No. 2 & Violin Concerto, Op.12
Die sieben Todsünden: Stolz. Allegretto, quasi andantino (Anna I and Family)
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 0xfd8e4e76be3b1b87e6eb0384a92876eab09010375eb77d737c60aa2c54942334. 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/NLY331510774.
Die sieben Todsünden: Zorn. Molto agitato (Anna I, Anna II and Family)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bad95eff297f3d29c599ec999afa57f50dd1d84184a02a96f97b685bdee041a. 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/NLY331510775.
Die sieben Todsünden: Unzucht. Moderato (Anna I, Anna II and Family)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6713eb1bc94424fd9fa247d5356dee8dfdaccbcc56c548519070baa9a38c3ab. 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/NLY331510777.
Die sieben Todsünden: Neid. Allegro non troppo (Anna I and Family)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2824b114ede2c8676161e4470cd7d4222756438cb8fb5595971a43ff0f8455. 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/NLY331510779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc165d912609753ff72f976212cd03ebd169f5aa69ad9436abca774109ff03962. 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/NLY331510782.
Die sieben Todsünden: Prologue. Andante sostenuto (Anna I and Anna II)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9af4df365275d515f2fc373de370e81476ac0b926bd36790b348a4b67479eca. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331510772.
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
Die sieben Todsünden: Faulheit. Allegro vivace (Family)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4720cbae5b1f458f301a7fbe98583f82205204781dd3e99a56cf3abe3cb3da4d. 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/NLY331510773.
Die sieben Todsünden: Völlerei. Largo (Family)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e2f4822520ca2c858e5f00110da0a550fa5cc62ddbc1019493e90d32309573. 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/NLY331510776.
Die sieben Todsünden: Epilogue. Andante sostenuto (Anna I and Anna II)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f260791b02adef239790053c28b8b2092ddc1a9dfa0eff5688a1f55a5c7ec4d. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLY331510780.
Die sieben Todsünden: Vom ertrunkenen Mädchen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c2d66ecdb327abd6a4344bf453ea8dfbfa3d8e985b023f092d9902c73fa332. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/NLY331510781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7209dde806c847e7a5e5f22c74810395c54a7b8da36f3eb8f842953b006b4a59. 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/FR7JM1669010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa160565ba02ce7df7907070baa636ad285dae4efac37c933ec7d093c7c13d9fa. 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/DEU901501329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78669d9d66f4bc1f66cbbab235276efa81b44bcf435d2597f5a81a08a2113926. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USSM16700281.
Die Dreigroschenoper: Die Morität von Mackie Messer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4643dc0dd027ebb5630ae34a4b5cee6f05a4f68e1f0caaab1af10a1902d98f94. 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/FR7JM1669030.
Mack The Knife (also known as 'Moritat' from 'The Threepenny Opera')
The Golden Age of Light Music: Light and Easy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81980657fbfe60c93d72ceb4437005e703f18964a6f6338b1a415603c54d27cd. 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/CH6631158702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9e0246992b50590db37c852717fecb1877e80d96590a0f9933de204cf52a63. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEN962030307.
Short Stories - A Collection of Romantic Violin Pieces
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c936adaad8f664086c94afb1eb4d2e52fc5b80e1cd4196750ec1b7cc956147. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBELX0400754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe796efc8d08f33de6f31271dba99d502dab9c166ea7ddd8068d3bafa92380808. 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/FR7JM1669040.
Mackie Messer (aus der "Dreigroschenoper")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ed0146d68de45510a010ea84c30de238c60d53b879956dbd111f8778c578d0. 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/DEC730900395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc400d12058bd1e5cca336eb3686dd95a576825d88fe3ab5527a601a214e331e7. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEN962030321.