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 0xccbec9c2c43ed63183046012097b220039c3fba13589016ce14711389cb5ff91. 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/2b3cab5d-64f4-4423-acd0-db504955b9c4.json and https://artists.proofprofile.net/proofs/artist/2b3cab5d-64f4-4423-acd0-db504955b9c4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Learn German Lesson 1: Greetings, Introductions and Numbers (Absolute Beginner Series A1)
German Greetings, Introductions and Numbers (Intro)
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 0x2d9659e97f8bb6289ad50f21fdf0b2ea3b0d42f7d703f7caa34b34f75957fb1f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USDY42331885 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb76474b080b71699b517d0675e92019e679a534f370c9da5034890243b89c4be. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42331886 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198bfc25adeded3fa24752258d10094ce0687b59439dabfddc5d482d25b2df9f. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42331887 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa8f853d81c047446cd879d32903d3dce67c9f939e6590fd1b97025b366015b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USDY42331888 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1375036d4a95f6e8a124465a7529334dad38d34a55e09df0ac2c91ffa90c39e9. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/USDY42331889 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b44a0fd843a8ad1eb1b9068c59ca95b89b58f9113b6737e0c4f0f490515b659. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USDY42331890 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09e75bfa5ab3e930938f83d5a8a41395e9af3aae72701c59dd39183086fe01f. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USDY42331891 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 7
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508d42d2056f30c2fe25dc07a2be037dd76df581483163bc397f39b4e5072369. 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/USDY42331892 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618d83d8d89d8a27a3b9f1b619015097828a59437995fd0d0c959d3d811efe48. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USDY42331893 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 9
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294caf91a24ed39be850af9317e0ac09d6b857e866e6b15229cde6467f7b2753. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42331894 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 11
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd5f7e219c6433f0b9bd16f5adc91a8fce7f88ceb612e766c71d099c662c6dc. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42331896 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 16
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea2fad6f3fe936c8c6217f159cd31f80f62df25c2252821cd042985a3272b92. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USDY42331901 — a six-check JSON result.
Learn German Lesson 1: Greetings, Introductions and Numbers, Pt. 27
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923587278ef8864b7aa7dd1f54462c8ddc0433cd46a03094009a6de893547587. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/USDY42331912 — a six-check JSON result.
Learn German Language and Culture: Labour Day in Germany (Holiday Special)
Learn German Language and Culture: Mother's Day in Germany (Holiday Special)
Learn German Lesson 2: Numbers, Questions and Goodbyes (Absolute Beginner Series A1)
Learn German Lesson 3: Simple Questions and Answers for Conversations (Absolute Beginner Series A1)
Learn German Language and Culture: Travel and Vacation Vocabulary (Holiday Special)
Learn German Lesson 4: Formal Dialogues and Important Verbs (Absolute Beginner Series A1)
Learn German Lesson 5: Hobbies and Important Irregular Verbs (Absolute Beginner Series A1)
Learn German Language and Culture: Oktoberfest in Germany (Holiday Special)
Learn German Language and Culture: Unity Day in Germany (Holiday Special)
Learn German Lesson 6: Most Common Verbs and Adverbs of Frequency (Absolute Beginner Series A1)
Learn German Language and Culture: Halloween in Germany (Holiday Special)
Learn German Lesson 7: Adverbs of Time in German (Absolute Beginner Series A1)
Learn German Language and Culture: Christmas in Germany (Holiday Special)
Learn German Lesson 8: The Days of the Week and Telling the Time (Absolute Beginner Series A1)
Learn German Language and Culture: New Year's Celebrations in Germany (Holiday Special)
Learn German Lesson 9: Essential Grammar, Introduction to German Nouns (Absolute Beginner Series A1)
Learn German Language and Culture: Valentine's Day in Germany (Holiday Special)
Learn German Lesson 10: Adjectives and Conclusion of Season 1 (Absolute Beginner Series A1)
Learn German Language and Culture: Easter in Germany (Holiday Special)
Learn German for Beginners While Sleeping with Relaxing Beach Sounds: Greetings, Introductions and Numbers (Lesson 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940bcc30f8f0b4455348505f205f4213b46d04b5d839590fcc8972addaa92236. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USCGJ2428601 — a six-check JSON result.
Learn German for Beginners While Sleeping with Relaxing Beach Sounds: Numbers, Questions and Goodbyes (Lesson 2)
Learn German for Beginners While Sleeping with Relaxing Beach Sounds: Simple Questions and Answers for Conversations (Lesson 3)
Learn German: Travel and Vacation Vocabulary (Holiday Special 2024)
Learn German for Beginners While Sleeping with Relaxing Beach Sounds: Formal Dialogues and Important Verbs (Lesson 4)
Learn German for Beginners While Sleeping with Relaxing Beach Sounds: Hobbies and Important Irregular Verbs (Lesson 5)
Learn German for Beginners While Sleeping with Relaxing Beach Sounds: Most Common Verbs and Adverbs of Frequency (Lesson 6)
Learn German for Beginners While Sleeping with Relaxing Beach Sounds: Adverbs of Time in German (Lesson 7)
Learn German for Beginners While Sleeping with Relaxing Beach Sounds: The Days of the Week and Telling the Time (Lesson 8)
Learn German for Beginners While Sleeping with Relaxing Beach Sounds: Essential Grammar, Introduction to German Nouns (Lesson 9)
Learn German: Oktoberfest in Germany (Holiday Special 2024)
Learn German for Beginners While Sleeping with Relaxing Beach Sounds: Adjectives and Conclusion of Season 1 (Lesson 10)
Learn German: Unity Day in Germany (Holiday Special 2024)
Perfect Waves (Study, Focus, Sleep and Stress Relief)
Learn German: Halloween in Germany (Holiday Special 2024)
Learn German: Christmas in Germany (Holiday Special 2024)
Learn German: New Year's Celebrations in Germany (Holiday Special 2024)
Learn German: Valentine's Day in Germany (Holiday Special 2025)
Learn German: Easter in Germany (Holiday Special 2025)
Learn German: Labour Day in Germany (Holiday Special 2025)
Learn German: Mother's Day in Germany (Holiday Special 2025)