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 0x8e835a22bb334754146c739beff7987bb6b7d74e7d79a4b351665787cd4990b5. Chain 2 (Bitcoin): anchored in block 953614 (2026-06-14T08:40:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14fb7a14-bdd7-4f71-814f-14ccd6091b8d.json and https://artists.proofprofile.net/proofs/artist/14fb7a14-bdd7-4f71-814f-14ccd6091b8d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Business German Vol. 2: English - German
Business German, Vol. 1 (English-German)
German for Life and Work, Vol. 1 Full Phrases
German for Life and Work, Vol. 2 Full Phrases
Vol. 3 German for Life and Work, Answer 18 Questions
Vol. 1, Four Expressions to Level Up your German
B1 Vocabulary: German for Life & Work, Vol. 1
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 0xcce0b147930ebedcc2dd00bccd9c9ec3bfcefb7e78b1f22792fd9e18d24e3c0e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAENV2245302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e9412781c6d03b9a63ad9b057579c51087a11d0309cd32d854c3a4006d37a1. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAENV2245308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e89efd58ca59d3751a859e57b94704111af3664427ae7dfd91e8dbd4ae0d28. 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/CAENV2245301.
B1 Vocabulary: German for Life & Work, Vol. 2
B1 Vocabulary: German for Life & Work, Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e70def449e50277d64553cce3df7426306dcb9a2f1d5aac4fbb2574fbf4b51b. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CAHQJ2335520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9534b3e2f6dd9bd868d8bc04927757e57b5b4c2f00acbd060b855c600b94fe44. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAHQJ2335521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74dafc0c8e077e4af6e44892cf2083ac791d2faeb553a7239115f077f5b8a68b. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/CAHQJ2335524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6c88b060652ab12f53d029d2162f967a662a6a14111a59e0d5bb42a9b26df8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAHQJ2350045.
B1 Vocabulary: German for Life & Work, Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6ccdf75622aec35faa04bff6add39775626ebca96dfa69a84c4a219032309c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/CAHQJ2365103.
B1 Vocabulary: German for Life & Work, Vol. 4-5
Der Die Das Drills with Examples, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ec5f7296977db88e592303c0a218a141a01a9dc136c8e8f3bc0d87b932fe64. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/CACWV2326994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338bf76b09d105e86c12e7dc552bf4e86e6af478031bb7dc21141addbb70a858. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/CACWV2327006.
B1 German Verbs with Examples, Vol. 1 - 3
Speak German without Overthinking, German Phrase Blocks - Vol. 35
Speak German without Overthinking, German Phrase Blocks - Vol. 36
Speak German without Overthinking, German Phrase Blocks - Vol. 34 to 36
Speak German without Overthinking, German Phrase Blocks - Vol. 37
At the Cafe & Restaurant: Everyday German Phrase Blocks & Examples
Gute Nacht Deutsch: Relaxing Moments to Ease into Sleep
Listen and Relax with Real German: Everyday German, Vol. 1