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 0x2a72389eb96139ddd108800afb7f175ba29934a8c85fd85cdaf534a116383bf0. 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/1879c02c-2f78-4ee8-b2f0-2cdd6d86fbb2.json and https://artists.proofprofile.net/proofs/artist/1879c02c-2f78-4ee8-b2f0-2cdd6d86fbb2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Langenscheidt Hörtraining mit Musik Spanisch
Langenscheidt Hörtraining mit Musik Italienisch
Kapitel 1 & Kapitel 2.1 - Langenscheidt Hörtraining mit Musik Italienisch
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 0xe54e52e36ee6ccd70109d910dcac4fae61897578b8164bf740705bcaa4c74193. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEVP81211201.
Kapitel 2.2 & Kapitel 3.1 - Langenscheidt Hörtraining mit Musik Italienisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c0b619d3401823d6091a62441f244d07a7301d0a57a5419d68adfe834447f2. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/DEVP81211202.
Langenscheidt Hörtraining mit Musik Französisch
Langenscheidt Hörtraining mit Musik Englisch
Kapitel 3.2 & Kapitel 4.1 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8626501bf220e3cc2fc4a60ffffb686a1b120808b0cc3efa5ea3d3fd5a0f0c. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/DEVP81211229.
Kapitel 4.2 & Kapitel 5.1 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1081c7d44659a38bc1994b60b44a5d474f98c574ba149fca9b175f8c94237a0e. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/DEVP81211230.
Kapitel 5.2 & Kapitel 6.1 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c05d68f3d4d5357de18fe9c00407652a3cd87526845df7d044b74af25a420f. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/DEVP81211231.
Kapitel 6.2 & Kapitel 7 & Kapitel 8.1 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916223cf35be9458a9bec2633edaf950296d8b18eea4ba4ff39ccdd87e70d280. 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/DEVP81211232.
Kapitel 8.2 & Kapitel 9 & Kapitel 10.1 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85abe4a9be08d1567464a994da299618388909454ae33459d6415ae16786779. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEVP81211233.
Kapitel 10.2 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e99cedbf71139ef4888bbb223003254cb98d12c5f37e0f820e465acab1c9b98. 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/DEVP81211234.
Kapitel 10.3 & Kapitel 11.1 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc3c8236103149127cd26e6eda13b7b0e89744c81657947a26f0403d514bb823. 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/DEVP81211235.
Kapitel 11.2 & Kapitel 12.1 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca22e64887819285977e06987eeaf2573b4b9a34d2f436ee89f060d65b00a3a8. 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/DEVP81211236.
Kapitel 12.2 & Kapitel 13.1 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96930fd0f363780ee29e87fce7bf5f0c475db6e1d663134a9a37f71a394890bc. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEVP81211237.
Kapitel 13.2 & Kapitel 14 & Kapitel 15.1 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe921877e377985eb43694732e67e98f248c74e24e45e72f7b7ef28aa366a0853. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEVP81211238.
Kapitel 15.2 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0687cfab43d7629ff01f209e98c2c06b541534314fa910e7c08be9e757e2ae1. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/DEVP81211239.
Kapitel 15.3 & Kapitel 16.1 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c28a89cb8519ecb50c86d256d7be7d772c6568e59b6e38f4a7458993a3d127d. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/DEVP81211240.
Kapitel 16.2 & Kapitel 17 - Langenscheidt Hörtraining mit Musik Englisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed03277130eb6f477ff0206689b275532868403d121511f2444a08f391619cb. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/DEVP81211241.