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 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 0xee79b72ad617c1bd76772201fb8eed770654c0b8675425800e19a62b90c98e08. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b14e6d17-825e-47da-99ed-7f40ed7f40d9.json and https://artists.proofprofile.net/proofs/artist/b14e6d17-825e-47da-99ed-7f40ed7f40d9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violin Concerto in D, R.234 "L'inquietudine": 3. 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 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 0x85b3b5d3d9e112f533398ff0d93d48cd73a41148f2fadd75627ca5b5c0e63891. 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/GBBBA0900600.
Violin Concerto In D Minor, Op. posth., MWV O3 - Ed.Menuhin: 3. Allegro
Mendelssohn/Bruch: Violin Concertos (Bonus Track Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2989122486e0e44e70517ab968780b72c6892fa4b0599726bfbbfe453a7e4b1d. 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/GBBBA0600600.
Orchestral Suite No. 3 in D, BWV 1068: 2. Air
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150f25c9efdf82079728d88f422a2b2b165bb25e237b6aa45ab2c09fd82ba585. 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/GBF071301660.
Orchestral Suite No. 2 In B Minor, BWV 1067: 7. Badinerie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8231be27393683dc9d25ddc1e0d607105f9dd64af744a687ceaeee3c0957c1. 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/GBF071301650.