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 0x5d6942caae3308fd6fcccfd40bf6bdb6a5883af0e1d733a7a0ef470a8baf6886. Chain 2 (Bitcoin): anchored in block 954025 (2026-06-17T00:32:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38d9f8f6-13ca-4c51-a45e-a844a9b82758.json and https://artists.proofprofile.net/proofs/artist/38d9f8f6-13ca-4c51-a45e-a844a9b82758.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Telemann: Concerto for Two Oboes and Trumpet in D Major, TWV 53:D2: I. Allegro
Vivaldi, Telemann & Marcello: Baroque Trumpet Concertos
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 0x1cfcfafbd35fcc9e890b1312fc9aa179fcf7f1acc352d6f32f14b6383b91c2b1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA809515501.
Telemann: Concerto for Two Oboes and Trumpet in D Major, TWV 53:D2: II. Adagio - Aria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb99d82706dca3f5cb7a950d1a62029027bfd8f100d7271aff700cb895b4f088. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEA809515502.
Telemann: Concerto for Two Oboes and Trumpet in D Major, TWV 53:D2: III. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fe6ab6f538c51b5502010865bad38797ca615d37f8cc588e08254450c525f9. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEA809515503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd016c0e756cc49277b2eb99bdd52dac181be3e02c6b0233225e37df8645dd2. 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/DEA809011000.