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 0xee0c72042eb2ceae3280f22e2553e48ecb1f063b2ef0294859d6f344e5fc4aa2. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a81adc6-e8dc-4fe9-8f5b-a658ed85ec96.json and https://artists.proofprofile.net/proofs/artist/9a81adc6-e8dc-4fe9-8f5b-a658ed85ec96.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
PONS Audiotraining Plus SPANISCH (Für Wiedereinsteiger und Fortgeschrittene)
PONS Spanisch Audiokurs mit Kurzgeschichten (Sprachkurs zum Hören, Üben und Verstehen)
PONS Wortschatz-Hörtraining Spanisch (Audio-Vokabeltrainer für Anfänger)
PONS Hörbuch Spanisch: La última fiesta de Cardeña [20 landestypische Hörgeschichten zum Spanischlernen (A2/B1)]
Kapitel 1 & Kapitel 2.1 - PONS Französisch Audiokurs mit Kurzgeschichten
PONS Französisch Audiokurs mit Kurzgeschichten (Sprachkurs zum Hören, Üben und Verstehen)
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 0xd398db4d211a2cb5ecb81553adfc0ec7a5044377e307540d8ff7cd40e50aa5ca. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-17T03:46:32Z), 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/DEWM40407936.
Kapitel 2.2 & Kapitel 3.1 - PONS Spanisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ba14c1ea51053ef2741e2b796a351abca0411c09a3b2320c1154a0e060c7cc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEWM40410270.
Kapitel 2.2 & Kapitel 3 & Kapitel 4.1 - PONS Französisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e23908444d239e2032af601e831d742ad2d3005a53fc15cdefccb492b590b50. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/DEWM40407937.
Kapitel 1 & Kapitel 2.1 - PONS Spanisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b067e5ac3cc100a6c6b142ba81b9c46e233e66976f8653eba54981a36aa9c01. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEWM40410269.
Kapitel 1 & Kapitel 2.1 - PONS Italienisch Audiokurs mit Kurzgeschichten
PONS Italienisch Audiokurs mit Kurzgeschichten (Sprachkurs zum Hören, Üben und Verstehen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a203ce8c66f2fa62698201c8896ddcb1c50f3bd3bed781b5511096a71fef9f. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEWM40409648.
Kapitel 6.2 & Kapitel 7 & Kapitel 8.1 - PONS Französisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8824222b9243831ca014a0139ef25637046b8a517a5bce6017f44af8a0fcbf6e. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:09:26Z), 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/DEWM40407939.
Kapitel 1 & Kapitel 2.1 - PONS Englisch Audiokurs mit Kurzgeschichten
PONS Englisch Audiokurs mit Kurzgeschichten (Sprachkurs zum Hören, Üben und Verstehen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9de76c08643a0cee0c97a28c3c2ea7486efa4d28b7821d138dbd18fb49ed923. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DEWM40407396.
Kapitel 2.2 & Kapitel 3.1 - PONS Italienisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ace48d8ee5419ba79195ca13a66f1e86de43280e3c320ba02c85f316e04fdc. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/DEWM40409649.
Kapitel 4.2 & Kapitel 5 & Kapitel 6.1 - PONS Französisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8267db8438984fc776a6cfb559115d4df78043b3fc23683243fd2c9b8c33bc15. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:09:17Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEWM40407938.
Kapitel 2.2 & Kapitel 3 & Kapitel 4.1 - PONS Englisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe142c0254e8142d09a6d8d724b32860a2253134dd5d27ce9b92bc29478854749. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:26:54Z), 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/DEWM40407397.
Kapitel 3.2 & Kapitel 4 & Kapitel 5.1 - PONS Spanisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07018de89e097dcd33d73d7e38236447dc2c594927624cf152c9eb55eeaedf2. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:48:29Z), 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/DEWM40410271.
Kapitel 17.2 & Kapitel 18 & Kapitel 19.1 - PONS Spanisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fcfa0c303d1e1cafd527788942d68cfa4cb12d65d3657297ca9b2d5041e6c3. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEWM40410278.
Kapitel 3.2 & Kapitel 4 & Kapitel 5.1 - PONS Italienisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98eb2809400975d5d8ac123da00e80d03616913dda570b754ad4b300345e8c0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEWM40409650.
Kapitel 4.2 & Kapitel 5 & Kapitel 6.1 - PONS Englisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a6fe53004d8c533c1811175f7c8058d5ceadb1da5cb04a0b6fa19d270dd026. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T13:02:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEWM40407398.
Kapitel 7.2 & Kapitel 8 & Kapitel 9.1 - PONS Englisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d74f796737a8e64bcfe78344c12694b17c61a6e2c09f635b439eea0b425dce. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/DEWM40407400.
Kapitel 5.2 & Kapitel 6.1 - PONS Spanisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117f9fce048adae7e0a6fd4d7d3adbeb64fbcdfa21043b6d902dc032d793f3b8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T08:01:49Z), 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/DEWM40410272.
Kapitel 12.2 & Kapitel 13 & Kapitel 14.1 - PONS Französisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089630c85837adf82272e04bb2259b5f1dbe5e45214d77429aec43eda9124bb2. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/DEWM40407942.
Kapitel 6.2 & Kapitel 7.1 - PONS Englisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3389ffa48d997b8fc8025d800826f8ae3c082504845fac30877da20409180425. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEWM40407399.
Kapitel 8.2 & Kapitel 9 & Kapitel 10.1 - PONS Französisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43187bbd1b21b75505fabd81786ff4adb3dc28c64ffe12131151b408baf2eeb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEWM40407940.
Kapitel 14.2 & Kapitel 15 & Kapitel 16.1 - PONS Französisch Audiokurs mit Kurzgeschichten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d2cfd4a09f7d848998daf902e495c6d3a7004d53685b6f5fc1b47855d5d80f1. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEWM40407943.