thumb|Jansen (2010) Maarten Evert Reinoud Gerard Nicolaas Jansen (born 4 October 1952 in Zeist) is a Dutch academic and professor of Mesoamerican archaeology and history. As of 2007 Jansen holds the p
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 0x0b1e9e51b30cf45aff4e13ce0923036bb5e84b54c64691540f33f848ea1fcd55. 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/125e5b9b-1d52-48c4-8e1d-c3efff9494a2.json and https://artists.proofprofile.net/proofs/artist/125e5b9b-1d52-48c4-8e1d-c3efff9494a2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violin Concerto No. 2 in E Major, BWV 1042: I. Allegro
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 0x71f370f4f30ec9a08d7a132d6b9d20befd185ad52343e6f7c7c62922899d4de4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF071301611.
Violin Concerto No. 2 in E Major, BWV 1042: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfcb17e84f2b696d5d4f97f74fb4c71aba5aacf70e22f5b86a1290a50928d437. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBF071301612.
Violin Concerto No. 2 in E Major, BWV 1042: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eec0795ea29accb20115160d580b2535c2fc831e326c170dc06f59b21c1ae40. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBF071301613.
Violin Concerto No. 1 in A Minor, BWV 1041: I. [Allegro moderato]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f338715e8b2c4768a02051d18f16443f8b94cc929e81420d07700535ca4609b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBF071301621.
Violin Concerto No. 1 in A Minor, BWV 1041: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223137c1157febf9f3e98c0db43b0749d3f4e01bc2f3921af76607f27c9e62d7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBF071301622.
Violin Concerto No. 1 in A Minor, BWV 1041: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381f0ec80fd08357d7e6acfa6e149e2fcf618ecec9b94cbcb474e6d00e09af35. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBF071301623.
Concerto for Violin and Oboe in C Minor, BWV 1060R: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fcaa8432e6443cd5e0e4becf73c1aa470621ab85ff72469d0e6c417f17b842. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF071301601.
Concerto for Violin and Oboe in C Minor, BWV 1060R: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c6bae89b9f5c3141042710928996eeb231292ff86ac3d2d1c0db2de3f2a0ee. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF071301602.
Concerto for Violin and Oboe in C Minor, BWV 1060R: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06eceb7afb48fa403a32905743e6e0251ead01054a4fea9c0a5ed81807a537e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF071301603.
Violin Concerto No. 1 in E Major, RV 269 "La primavera": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf7d70bfc170faad89bbc28af8caa05f81517470a363eac5295053feb14cc03. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBBBA0441710.
Violin Concerto No. 1 in E Major, RV 269 "La primavera": II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a93f99b2d35b1326be8bacc235fa79adbf479be26bb8ad33bb43f4cdf21490. 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/GBBBA0441720.
Violin Concerto No. 1 in E Major, RV 269 "La primavera": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3056548a1cec31478dd1b888fce377861da76cdef44e5e5532ac34356b89be9e. 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/GBBBA0441730.
Violin Concerto No. 2 in G Minor, RV 315 "L'estate": I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9141cc64d56b70899fad92459d6926bb0729b55a09ae70a0b5bae754f459613e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBBBA0441740.
Violin Concerto No. 2 in G Minor, RV 315 "L'estate": II. Adagio - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10dc3d25624af1d467b4d1ba4ffff333bb607f522b5a4d9f893c34a9d6304c28. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBBBA0441750.
Violin Concerto No. 2 in G Minor, RV 315 "L'estate": III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527b0bba47ee795ba3e81b2ef0aed7b2a9c0c0926390593288109cfc8ed51c37. 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/GBBBA0441760.
Violin Concerto No. 3 in F Major, RV 293 "L'autunno": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93113edf3f21fa61ff9f5a0e9d7179d05b85c444a0cbe47d67cf0a539e93763a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBBBA0441770.
Violin Concerto No. 3 in F Major, RV 293 "L'autunno": II. Adagio molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48720c5844c06428991d7d313942fe44e9340e6b24aa13149ad41f331354925d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBBBA0441780.
Violin Concerto No. 3 in F Major, RV 293 "L'autunno": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa03ac9a189e1a9b9c98723d35fd89dbbc1980cf94b84d420fbc4d3884b8538. 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/GBBBA0441790.
Violin Concerto No. 4 in F Minor, RV 297 "L'inverno": I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d1220eda5d3ac17b4dbf7fb75faa5e98603ef53d80843dbf7a65018edf3969. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBBBA0441800.