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 0xef70425b7f5c7264a3c6347f7eeb5f0004b064d82bb24100b7bdad20361869be. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44d5b7e5-b9b2-4fdc-85f4-9a4fa970398d.json and https://artists.proofprofile.net/proofs/artist/44d5b7e5-b9b2-4fdc-85f4-9a4fa970398d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Violin Concerto No. 5 in A Major, K. 219: I. Allegro aperto
Mozart: The Violin Concertos; Sinfonia Concertante
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 0xa843a19f4c4d71e7c45a15a88fede16c5be497b62935fd976d3a609090c5e4ff. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960500091 — a six-check JSON result.
Violin Concerto No. 5 in A Major, K. 219: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3927b7a9b859f322e0f31e5ca9c845df229b0b03400a70e81b710c3d5130c7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960500092 — a six-check JSON result.
Violin Concerto No. 5 in A Major, K. 219: III. Rondeau (Tempo di minuetto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330ac3da3713e0d0e8a0f598d98cfe178796e3ae394f4c6b62f8bf65b343d1ec. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960500093 — a six-check JSON result.
Violin Concerto No. 5 in A Major, K. 219 "Turkish": I. Allegro aperto
Mozart: Violin Concerto Nos.3 K.216 & 5 K.219
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc2f2077bac968ef16addfeacdb7c7825f8a6f2bc6f7e6cf6d494cc8e1e96ab. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057800361 — a six-check JSON result.
Violin Concerto No. 5 in A Major, K. 219 "Turkish": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539921917a4bf16eca59109a9e56d303500b688763fcebff9593fb24b9267b57. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057800362 — a six-check JSON result.
Violin Concerto No. 5 in A Major, K. 219 "Turkish": III. Rondeau. Tempo di menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7edc81e7652f3ac2751fdbdff37615024a71c010735325b5928d0133d65fd2f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057800363 — a six-check JSON result.