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 0x4fac214c7a7cf5c7bace895f5469216b1a31cb514f462eb040326a13cbdb5bad. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dff2aa45-b3f6-493b-b7fb-81e37c67e929.json and https://artists.proofprofile.net/proofs/artist/dff2aa45-b3f6-493b-b7fb-81e37c67e929.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rhapsody for Alto Saxophone: II. Calmato
Royal Symphonic Band of the Belgian Guides
Belgian Music for Alto Saxophone and Wind Band
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 0x635643fae8ae8a9244f731fb4531fb38c0e6d5eb1379d77b6da41fd9945cdb23. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLC351318304.
Belgian Military Marches, Vol. 3 - Artillery and Others
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488c4b0ad7f32298b5087d67d1db34a14cfe7cf0bda4613560375388cd27184f. 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/NLC350310301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28fa03a48725b8f7ab79dc399018d8ceb0758c985014980b481ca78a8b1de8a2. 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/NLC350310302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ec8dd11faf380394cef10d7404c1ef7c92f2df263f0e3346ad132ba940128d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLC350310303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81374cef76bb493d84b96f1a3acf514fa7e795ac054a84007aa07007974fa88d. 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/NLC350310304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd559dddcd1b4cda4ce6372ae86f404b7f6962139d765e73bfdba6264834e1951. 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/NLC350310305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f6b48bc60186f1f9760f99cc31a6687f6e936dce50a7f7b26c591023b40c3e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLC350310306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc4b48f503a099e69bbc7d058c176bbe52e6feb96bde89d5c72ebbc9babe505. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLC350310307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4efcc4fbe96b92c94c6d4ef0b95389814bf97b36f49085d53db2aae91d65f5e. 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/NLC350310308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f35e0d021cef6b1bccf4c3013418bb28fa692a5e39204203dacde3a1cea205f. 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/NLC350310311.