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 0x6d215bc2fb39c02f17c0847356138e020cefa8010b257530ec0f506c80461065. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a50bfd6-ac1b-4e8c-9d9c-623965f39b86.json and https://artists.proofprofile.net/proofs/artist/4a50bfd6-ac1b-4e8c-9d9c-623965f39b86.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
South West German Radio Experimental Studio
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 0x681db4b3633ff7aa7a6d5c2e4abe9e6e1ed2e071d218187ac5a301ad595a8e85. 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/DEGF70912702 — a six-check JSON result.
Persiche trommler (Persian Drummers): I. Tchai Kuneh
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e806728a0cae96c22407ea1ab9400fb284b471d45cac39582e92b6872b452a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEGF70913203 — a six-check JSON result.
Persiche trommler (Persian Drummers): III. Tappeh
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b229fa74634cd96b5625f3f98365917a365b7efef89c28a3a3d0253c934884b. 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/DEGF70913205 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8869185a7140b8f6f23ddca53c9290598a3cb1c86fb26b5f81671f6060c84ba4. 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/DES380002646 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1133a9057b4e53df94bcd28e8df13c350bf4365b96857c60e6ada4119d374be8. 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/DES380002653 — a six-check JSON result.
Oboe Concerto in D Minor, Op. 9, No. 2: II. Adagio (arr. for trumpet and organ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18e9479a4b78d135b948f713ad6dd482cdc620cbfcf8b3661255d5298accfdd. 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/USB8U1011367 — a six-check JSON result.
Overture (Suite) No. 3 in D Major, BWV 1068: II. Air, "Air on a G String"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d5bd1acb22c41373e890bd2888eedc651c578a8283dc98d329ab31803ab775. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USB8U1011369 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f7b2cd63d1d12285af49874083c0a2daa0c08c0d97992c75454bacdf6d1555. 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/DES380010077 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e20f37f3f639800c381a4677128281826a53bcba41058b223f40b7545dd5a9a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DES380000925 — a six-check JSON result.
Kantors and Organists at St. Thomas, Leipzig
Saint-Saens, C.: Oratorio De Noel / Mendelssohn, F.: Vom Himmel Hoch
Vom Himmel hoch, da komm ich her (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0fec6d6b87251da40dcf2a6deb70ff41944168912b4e07942166bc9ffedd496. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USB8U1009971 — a six-check JSON result.
Vom Himmel hoch: Finale: Lob, Ehr sei Gott im hochsten Thron (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b664f3a7889e05e1c89e3f08c1c56317319f83203d6fd9724a31cb1bc920e70. 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/USB8U1009976 — a six-check JSON result.
BACH, J.S.: Masses - BWV 233-236 (Flamig)
Angel Voices: The Boys' Choirs Christmas Celebration
Die schonsten Deutschen Volkslieder, Vol. 1
Mendelssohn, Felix: Vom Himmel hoch / Magnificat in D major / Hor mein Bitten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0fec6d6b87251da40dcf2a6deb70ff41944168912b4e07942166bc9ffedd496. 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/USB8U1009971 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb798092d95ed791e41eb00e9105be2c44189e454fc8e271e669acfb5d11f2a85. 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/US2TL0904502 — a six-check JSON result.
Choral Music - Bortniansky, D. / Schubert, F. / Mendelssohn, Felix / Silcher, F. / Grieg, E. / Brahms, J. / Abt, F.W. / Bruch, M.
LACRIMOSA - Sacred Music from the 17th Century
Berlin Radio Symphony Orchestra, Berlin Radio Choir, Helmut Koch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da35dc2853cc1184a50cac85e204ea581acb59b7405b735896a4ea78559954a. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DES380002607 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55974af26a2f83e11eb9d67652e4f861272384e8f164a13144c801c84cb9fc1. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/USB8U1013683 — a six-check JSON result.
Vesperae solennes de confessore, K. 339: Laudate Dominum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35f5efe6bc3645c3ec0802ad8fa596d5607f9f2ac003ed07c4a3c0f9e4b9255. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEB261201505 — a six-check JSON result.
30 Little Chorale Preludes, Op. 135a: No. XVI, Macht hoch die Tur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9731d1696d0f1bc8d1c72bf8fd6f61501e8ad289fe6bbdefc5abcf4d5f214bee. 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/DES380002121 — a six-check JSON result.
Music in the GMBR, Vol II (Musik in der DDR, Vol II)
Dresden Kreuzchor: Volkslieder (Folk Songs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090107ca3ad7f2d4e11097b147710ab48e93619c4bfc3523c18f55b8a902a401. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/DES380503009 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830c42705d3f0c2a1c5d7a471e788a5a6a408b1f07b6e135764279358c025a47. 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/DES380503016 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ec9117c622a8a6cb8043cb6a8863cd14e0a1c317b33719f5919d9cb23a7561. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380009048 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6992435732b155afb5ea22ecadf88b690ecba408976ab274f6042f39e56aa9e. 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/DER411080095 — a six-check JSON result.
Praetorius, M.: Quem Pastores Laudavere / Bach, J.S.: In Dulci Jubilo / Eccard, J.: Ubers Gebirg Maria Geht
Stille Nacht, Heilige Nacht (Christmas Concerto)
Vocal Recital (Bass): Adam, Theo - TELEMANN, G.P. / MOZART, W.A.
Bach, Cornelius, Mausberger & Schütz: Vocal Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b4abf6b74c93e438c3fd4d61b8d754aa6b47177192e7f77ed6b7a8888bb1b5. 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/DES380010989 — a six-check JSON result.
Hansel und Gretel: Act I Scene 1: Suse, liebe Suse, was raschelt im Stroh?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd324949c29caed1e8240277d281bf514bb37f37df66511366035b181e1e7d33d. 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/DES380010990 — a six-check JSON result.
Hänsel and Gretel: Act II - "Abends, will ich schlafen gehn"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f9412151eee76891045b257eef5aba2b43b3361eceb2ba2aaa433df3d1db15. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DES380010999 — a six-check JSON result.
Hansel und Gretel: Act III Final Scene: Vater! Mutter!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49c148bf36d0d64eae8bf09b389a2b9dd276f7381ef5db4a5516223f98f97b9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380011010 — a six-check JSON result.
Schütz: Psalms of David (KulturSpiegel - Eterna - Über Grenzen Hinaus)
Bezauberndes Weihnachtsoratorium - Jauchzet, frohlocket! - Bereite dich Zion - Großer Herr und starker König - Ehre sei Gott in der Höhe
Herzlich lieb hab ich dich (Choral music from the Seventeenth century)
Concertus V - "Hodie completi sunt": Part II - Sinfonia "Misit in universum mundum"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e9f6b9bb69cee772ee47388ca5b74d332e4917798c42740d2f5c46a19187d4. 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/DES380001469 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6425227e6b26599d910d952f3d58aff17bd9ae4ebbc174d660258aef7984a50. 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/DES380011149 — a six-check JSON result.
Berlin Radio Symphony Orchestra, Berlin Radio Choir, Helmut Koch, Berlin Radio Solistenvereinigung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c113b939b56743ffe0d2469a94ff9a1c3b74d71a692b8b5d76c74a82f5048fe. 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/DES380002652 — a six-check JSON result.