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 0xeab6fd262bd84194b43c4ec3dbbb08c8d73b0eec35920430566980fa524874d7. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb6068bd-4ba6-421f-b152-703a4545cd04.json and https://artists.proofprofile.net/proofs/artist/cb6068bd-4ba6-421f-b152-703a4545cd04.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Brahms: Complete Liebeslieder Walzer, Op. 52 & 65, Hungarian Dances
Liebeslieder-Walzer, Op. 52: No. 1, Rede, Mädchen, allzu liebes
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 0x3a6f031e8e419f83abbdae5f06ab10edbeae7d3fe3ddf00db647b0963948f0d5. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/FR7JM2136010 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 2, Am Gesteine rauscht die Flut
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e4f8f9e7f3b3787a9ef1732195d155b6ba600cc980fdac4b8414a1f99e914f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2136020 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 3, O, die Frauen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5bcc8c6ee3e1813079b99afb576a74a66e8865a6fa0aca6be9ded2d756e94c. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/FR7JM2136030 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 4, Wie des Abends schöne Röte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026189b10d49646948ba3553c5d1f67dd98e2f17d74a3ee96aadde3a8e8e361c. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2136040 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 5, Die grüne Hopfenranke
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8a0f3722ea82105391172dbcc82c242971c8596a98719645f6cfd022603ade. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2136050 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 6, Ein kleiner, hübscher Vogel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649ef66d84bf5665c24f342a80dbfc50942ee0ab0937430cf77901ad641cac62. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2136060 — a six-check JSON result.
Hungarian Dance No. 7 in A Major (Allegretto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6244f9327d29f64b71923576b214d99f32de688cd84f88fbd0e704ddae2b6471. 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/FR7JM2136070 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 7, Wohl schön bewandt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d16ece54c55dd39ca66905a0d621eb2866f1b8426cbd8f91256bbc09bac42f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2136080 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 8, Wenn so lind dein Augen mir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a96ab5d1cf456b71fdc4149602a54a36f1e66b9efc0f09e110b1ed85af0b9af. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/FR7JM2136090 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 9, Am Donaustrande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec50a98622d9d7ae9f28029e13fb67441dd752884a329c22636f9b3e93a5274. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/FR7JM2136100 — a six-check JSON result.
Hungarian Dance No. 20 in E Minor (Poco allegretto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9488f07cbb7c14ba857112ad86db86374c5e0d72058d15855787f6068f531280. 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/FR7JM2136110 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 10, O wie sanft die Quelle sich
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76bcceb6e23ff341c39b0a5f3cd0630c2c33e7647e36f8c385a763ca0ec054df. 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/FR7JM2136120 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 11, Nein, est ist nicht auszukommen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb197a94789f6702d3ca429e1cdafefa9b98d30ea8486391f19684a049c30f5a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FR7JM2136130 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 12, Schlosser auf, und mache Schlösser
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15681e401dda61a08302eee02235b3300a9adb56fb6ae8cc454e7501f4e2eea7. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR7JM2136140 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 13, Vögelein durchrauscht die Luft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb4643d6d48c2fe55ab58b3b1c8b4ec922c5e4fac133e8fc0cbb7ad3d23c9d5. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/FR7JM2136150 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 14, Sieh, wie ist die Welle klar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13a629459cc9df95d4c1c5d85368c3bb47237934206c7ef0a228a85cff35377. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/FR7JM2136160 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 15, Nachtigall, sie singt so schön
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca21447b436348e45940bfef5ce41a9485a1cfe4936f3146a3ddf0f7eba326fa. 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/FR7JM2136170 — a six-check JSON result.
Hungarian Dance No. 4 in F Minor (Poco sostenuto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe710cddc597e5574f6ab5d2f8b01943df0811935cf16364aad6fd82804aa60c2. 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/FR7JM2136180 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 16, Ein dunkeler Schacht ist Liebe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186c54881e1eafca098efc9654f3367d1a1d5d0bd8beef39c596f8c191194012. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR7JM2136190 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 17, Nicht wandle, mein Licht, dort außen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6333d5e7fd1fbb5c1ecbc3deea208c04247041719abeea2fb0b620ab0de1e673. 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/FR7JM2136200 — a six-check JSON result.
Liebeslieder-Walzer, Op. 52: No. 18, Es bebet das Gesträuche
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08df1bde1e741e48661571a0d411db25fdc103ae326cea8d1345fcb1d88a5a6b. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2136210 — a six-check JSON result.
Neue Liebeslieder, Op. 65: No. 1, Verzicht, o Herz, auf Rettung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15467c61882d4d5f66df87c0dec13441d4a89f2f60288a53a2f93584f8dc136c. 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/FR7JM2136220 — a six-check JSON result.
Neue Liebeslieder, Op. 65: No. 2, Finstere Schatten der Nacht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7d2c47c799a8c6e7c1ab24ead33d25bc6934c430633b45b79f86b2b23fda95. 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/FR7JM2136230 — a six-check JSON result.
Neue Liebeslieder, Op. 65: No. 4, Ihr schwarzen Augen, ihr dürft nur winken
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac532b9f8ede85fa30e94870ddfd68b63d4864f8394feafe9fadc0f0ef9b83ce. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2136250 — a six-check JSON result.
Neue Liebeslieder, Op. 65: No. 15, Zum Schluß
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d02ee3a031babfda92738dcb7f6329a40a2190799678185063da0c6e3437e3. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2136380 — a six-check JSON result.
Brahms: Am Donaustrande, Op. 52 No. 9 - Hungarian Dance No. 9
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4182770e1f119b60545f43db698f2e89d3eb82526440e0749392ee4029f863. 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/FRZ141224110 — a six-check JSON result.