thumb|Johann André. Portrait by Johann Heinrich Lips Johann André (28 March 1741 – 18 June 1799) was a German musician, composer and music publisher of the Classical period. He was born and died in Of
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 0x3d7dc9996b76dce028f95b66442aa5fec5d1061cbfe3553511f3f52fd06873b8. Chain 2 (Bitcoin): anchored in block 953857 (2026-06-15T23:34:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02cf5f83-2c5f-4ee3-8576-8cd9b2c77853.json and https://artists.proofprofile.net/proofs/artist/02cf5f83-2c5f-4ee3-8576-8cd9b2c77853.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
André: O alte Burschenherrlichkeit - Lieder der Studenten und fahrenden Scholaren
Lützows wilde Jagd (Was glänzt dort vom Walde im Sonnenschein)
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 0xf0b93d13cbc6eb9164ad7f9e1b8a4024b8cefa99c266b483316e9265a4cd868b. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEE700000722.
Andre, J.: String Quartets, Op. 32, Nos. 1-3
Violin Sonata No. 28 in E-Flat Major, K. 380 (arr. J. Andre): I. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48278dab06ca64f01d4816624a30733885c459cb925cd52b7826a4fdc54e8bb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199274105.
Violin Sonata No. 28 in E-Flat Major, K. 380 (arr. J. Andre): II. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bcd5eb5ff3f06a738a06f6c6ab6b161a119dc5e1cccac273ed34eecfb648841. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/HKI199274106.
Violin Sonata No. 28 in E-Flat Major, K. 380 (arr. J. Andre): III. Rondo: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73a6517ee0503af72d66c2f1ed6a5560ef4a311218014a976776fea4a839cbc. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/HKI199274107.
Kein schöner Land - Deutsche Volkslieder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec7d910c32483a3b298548af7d3068d1f7d7e8740bfed654a9fdfe8dcc18651. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057004860.
Rundfunk-Jugendchor Wernigerode (Männerchor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a0845936dfb1ec1d49e3032fc560e9c49d8d5788d6879b2b4038d3d902fb14. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEE702204263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966806b582f55dcd2ba1d3f72bace8956f5151292c3811ad826308371ee0701f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE702204265.
Alles, was wir lieben, lebe (Lebenslust)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a0e6f04612a85e818a2fb3123865e655c1cf2969c57ee070ffee4eb46b6ef2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE702204266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10dbee37ce696c948bcfc8364ddaae08280e113c6a001b7907b064dba0698b22. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE702204268.
Willkommen im traulichen Kreise (Freundschaft und Liebe)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a797bd8d16f6d43abe411c998fda8cca7cb1f28be54223f492d91bcb7918e2. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEE702204272.
Brüder, reicht die Hand zum Bunde (Freimaurer-Bundeslied)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6330e20bb43e3c65634defb04b05c61eca5680d05682d5403e3943b874ec74d7. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEE702204277.