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 0x8bdbb4399d31e479d873c9b5e5fe7dff72cfb1e7b9e25188253fc88c650c9b60. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfb9004f-52ec-4bd4-a290-0e55f66dcea1.json and https://artists.proofprofile.net/proofs/artist/cfb9004f-52ec-4bd4-a290-0e55f66dcea1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Telemann: Tafelmusik, Pt. 3, Oboe Sonata in G Minor, TWV 41:g6: VI. 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 0x0147f835cfd55914e2aac86784f0f1994e9d78d8dc5a1272ac90a677d3433df4. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/NLA278000485.
Telemann: Oboe Concerto in F Minor, TWV 51:f1: II. Largo e piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8283ae68a2703739301bcfee719320cf3b706131b726bca104e89733f15f91. 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/GBAYC8100226.
Partita No. 5 in E Minor, TWV 41:e1: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d84e5bf5963696db1fcebd52057b4eb105cee8fb38e404808e975e0e365595f. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/NLA460710914.
Partita No. 5 in E Minor, TWV 41:e1: II. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8692be314701adbb482d01be4414f2aa9e40cd055e15927bbc66793c0a18cb2f. 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/NLA460710915.
Partita No. 5 in E Minor, TWV 41:e1: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70206571656c810ac33900282ed6dac957265b897bfef8a19f81eae366fe751c. 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/NLA460710916.
Partita No. 5 in E Minor, TWV 41:e1: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb490c6eeca7d176e5e8a49a8ff25e4af1f1678dae9d6c36d61474aefa45a3b4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLA460710917.