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 0x645e1720c38d9b06287e3c9b4392658437808c261645f985b1d3da53da06963f. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ee065c6-5bdb-4a1c-a7f6-e2d0687fa4c0.json and https://artists.proofprofile.net/proofs/artist/9ee065c6-5bdb-4a1c-a7f6-e2d0687fa4c0.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Abendstern, D. 806 (Arr. for Voice & Orchestra by Alexander Schmalcz)
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 0x6315e05be88ba5cd280f039d8c5a07f6c74db8e1ab7359c492ee2724ffd1419f. 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/DELW72334601 — a six-check JSON result.
Rosamunde, D. 797: IIIb. Romanze. Der Vollmond strahlt auf Bergeshöh'n (Arr. for Voice & Orchestra by Anton Webern)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736136e124e09868c25662eb87d5f75af2c79038a0b258144536bfd9790d6613. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELW72334602 — a six-check JSON result.
18 German Dances & Ecossaises, Op. 33, D. 783: No. 1, Tanz I - No. 2, Tanz II (Arr. for Orchestra by Johann Ritter von Herbeck)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab507632c92751a99fbb3378479839eeb8214123332e538391776d422c09edce. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DELW72334603 — a six-check JSON result.
Geheimes, Op. 14 No. 2, D. 719 (Arr. for Voice & Orchestra by Johannes Brahms)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63b123e0f8e5029c4ac7509416217b0aa575f9a680ed5fb24f8a4ff04d35d77. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELW72334604 — a six-check JSON result.
Du bist die Ruh, Op. 59 No. 3, D. 776 (Arr. for Voice & Orchestra by Anton Webern)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbb8b665c5f3ca178e2e3ac02658ed225d8f59efeb67357760bd9294d196d50. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELW72334605 — a six-check JSON result.
Die schöne Müllerin, Op. 25, D. 795: No. 10, Tränenregen (Arr. for Voice & Orchestra by Anton Webern)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a472ec392f555d29b360aef2bcf6d804c4904a02e110c4e5bddfb9c07557e0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELW72334606 — a six-check JSON result.
18 German Dances & Ecossaises, Op. 33, D. 783: No. 3, Tanz III - No. 4, Tanz IV - No. 5, Tanz V (Arr. for Orchestra by Johann Ritter von Herbeck)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b3050f538abca993e11cd6a5c300f907232e59a21b1034f2c1308d3e2d836e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DELW72334607 — a six-check JSON result.
Ganymed, Op. 19 No. 3, D. 544 (Arr. for Voice & Orchestra by Kurt Gillmann)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3bcdffc6c60d06ef8792c01fc741abeac3c1992d1cd06beff1c97be9ceee58c. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DELW72334608 — a six-check JSON result.
Der Tod und das Mädchen, Op. 7 No. 3, D. 531 (Arr. for Voice & Orchestra by Felix Mottl)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f40d30dbdccd6bb605d43d8acd7fabc35473f66b31bcf13bad5fb2a2b8297f5. 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/DELW72334609 — a six-check JSON result.
Gruppe aus dem Tartarus, Op. 24 No. 1, D. 583 (Arr. for Voice & Orchestra by Max Reger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e18980a2330a8768b48179c08e96b4c7b4c4ed62f298c76a24f4022d9c2b900. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/DELW72334610 — a six-check JSON result.
Schwanengesang, D. 957: No. 9, Ihr Bild (Arr. for Voice & Orchestra by Anton Webern)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f349e26953de48d82c1c08afd08cefaa5405151014c2e9e0b6554540787a91. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELW72334611 — a six-check JSON result.
Die Forelle, D. 550 (Arr. for Voice & Orchestra by Benjamin Britten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61623d116a4d30fac56b879b31180f7e04cc763ba447e337d7c86d81c49b3365. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELW72334612 — a six-check JSON result.
18 German Dances & Ecossaises, Op. 33, D. 783: No. 6, Tanz VI - No. 7, Tanz VII - No. 8, Tanz VII (Arr. for Orchestra by Johann Ritter von Herbeck)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217f2194d6918094e4b67b604d1a9ba5b3a3872161e2bc0b26ab65041754c55f. 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/DELW72334613 — a six-check JSON result.
Im Abendrot, D. 799 (Arr. for Voice & Orchestra by Max Reger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90bc33c356943f46dc8d8a0b9ba63bc9081212fcc3d05bbde16b3c124a71f84. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DELW72334614 — a six-check JSON result.
An die musik, Op. 88 No. 4, D. 547 (Arr. for Voice & Orchestra by Max Reger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c049a618a41a1b8af94c8bf4b80b989de0b264a2bd70f9da98225fb792e63e. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/DELW72334615 — a six-check JSON result.
An Sylvia, Op. 106 No. 4, D. 891 (Arr. for Voice & Orchestra by Alexander Schmalcz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f5160a58fc107b09d74574ef63abdd88849a613e0a93bb956f919fcf8ded97. 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/DELW72334616 — a six-check JSON result.
Winterreise, Op. 89, D. 911: No. 20, Der Wegweiser (Arr. for Voice & Orchestra by Anton Webern)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce44c6d489a3652397a1f5c5a476f516ce524cf87f63bec754b07c279ff6ff2a. 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/DELW72334617 — a six-check JSON result.
Nacht und Träume, Op. 43 No. 2, D. 827 (Arr. for Voice & Orchestra by Max Reger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc8bba156efea2bf8db74e705de7ab4bab622992488b74fe568014805c3cd97. 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/DELW72334618 — a six-check JSON result.