thumb|200px|right|De Frumerie in the 1930s. Per Gunnar Fredrik de Frumerie (20 July 1908 – 9 September 1987) was a Swedish composer and pianist. He was the son of architect Gustaf de Frumerie and Mari
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 0x868083ba5b471b103659cc24718f69fa4c54873ff8564466a58317ccc458f8e5. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/60acb757-8c37-4e0c-8b84-533485afc9a2.json and https://artists.proofprofile.net/proofs/artist/60acb757-8c37-4e0c-8b84-533485afc9a2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Frumerie: Johannesnatten (Saint John's Eve)
Gunnar de Frumerie: Pastoral Suite, Songs, Chaconne, Trio No. 2
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 0x233fae0f4504adcc67e544056923052273e8482fc8e40fc839e39817801efd3d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1ae08512c367ddb53cc3056f008db4ad4215ef1141b43ec9c906dbe8857e03. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d6c3218a6c48f4c28de2cbfbe118e16b46f267079f900d1e1cd9ae54587476. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3d0aa4b5fb105a858c6c6235c5797fc29d738c6572d95aed3faa11446fd99b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c1a3219d8bfb3309bf418f7cfafcc598789addb0593793fb2b514ce6956840. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93957eb30e4c683b3b2d7e0cf1126e41cd5d1a01db13aaa84fd76855c804e566. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128554.
Hjärtats sånger, Op. 27: I. När du sluter mina ögon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a044b94b796e1b156f59dc1d6f131c655d6692ce00701d807ed4a8f58538ce. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5b041e3a4e4fc2305cb270bf8201b9159794182f8ac147d874eeb550498acb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128556.
Hjärtats sånger, Op. 27: III. Saliga väntan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c1125d0e34d04bff8ad780182d89e8cf7fb50e829f18df8bd2ba6dc905ccba. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128557.
Hjärtats sånger, Op. 27: II. Det blir vackert där du går
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d28daa7f81ba22e5b18d9b73f3c23af0c3e7b99ab3c2c925b1ceebfdd79b8e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946bec74022515c1981bcde32b3efe722cf579857141c007816cf4c00305075b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c27105c89c199dfdcd3cdef3682fd60ce8d46799513760d49bffe74dbff4ee1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591ea7e2fb404e7fa2df004223214e6bda437aeed569bde6f109dabd29bbce72. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47742b0e97c1760072c35ab4970e00990fe6fb8181e1f7480911b22b760961ee. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed8d332e4c72d192fbe63c9d2482c184ee1af90c0d61a0c3f2f67f146df3b2c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128563.
Piano Trio No. 2, Op. 45: II. Scherzo, Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315303e8cb7230ca6aa72da96b6cba3e635040fe3fcb3b61b301c33ad591495e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128564.
Piano Trio No. 2, Op. 45: III. Andante doloroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a4d67acbc809e32971bfffa48baea3af017c6057b77f02a7af1714f79980ee. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128565.
Piano Trio No. 2, Op. 45: IV. Allegretto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2518237553d2647dbe366eb4f84f705598a9b9a7dfe12ff4b9a46647166d11c1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62128566.
Hjärtats sånger Op. 27: I. När du sluter mina ögon
Hjärtats sånger Op. 27: III. Saliga väntan
Hjärtats sånger Op. 27: II. Det blir vackert där du går
Piano Trio No. 2 Op. 45: II. Scherzo Allegro vivace
Piano Trio No. 2 Op. 45: III. Andante doloroso
Piano Trio No. 2 Op. 45: IV. Allegretto grazioso
Frumerie: Variations and Fugue / Horn Concerto / Musica Per Nove
Frumerie: Cello Concerto - Violin Concerto - Symphonic Variations, Op. 25
De Frumerie: Pastoral Suite, 4 Études & Piano Quartet No. 1
Frumerie: Clarinet Concerto, Op. 51, Piano Concertino, Op. 78, Musica per nove, Op. 75 & Suite for Small Orchestra, Op. 5b
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6acf4a196b89ce40fd012cb69d10e0e3610d4712917fe2989432eb48e2f9574a. 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/HKI199938904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ca827cb8a902b655fb1add3593c2f0f7cd017ae3b275d2e90f966e3c7da78a. 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/HKI199938905.