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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5021d97ad9e8e5317456cf92323aeb7412e99e0266b54985f44932ddf1dc6519. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1d09286-1b33-44fb-89d3-327fe8dd8e52.json and https://artists.proofprofile.net/proofs/artist/b1d09286-1b33-44fb-89d3-327fe8dd8e52.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Portugal Julio Pereira: Miradouro (Belvedere)
Portugal Julio Pereira: Os 7 Instrumentos (The 7 Instruments)
Portugal Julio Pereira: Janelas Verdes (Green Windows)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28332d026481f5a28c5afea34f3f95e43afedbfd833f5876cb821f03ed8654bc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PT2EO0700320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e8e5f5556f68adf9bc8e849a0992065e35b01434ddfea02125265dcbfabce2. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/PTUM72400071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecda99d80aca5a5ec08f5f0ed970bc8f880c375fd4188c648760f5c26626cb0f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PT6GJ1700026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca781cf4483ac62f2dedf968aa4f0e868c6f8869c7fb78386d2df71155e4edf. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES5590602740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c68167e917ad6f1f33f71cc368602108c02f3643bb931411be1054cb07ec02. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PTBM21300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41641e9095e057826e6730d0eaaa4443a0a7cd681949bd59193d5b642a02498c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PTCN10100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97228f6175f74484eca0a0916838361535f45f542b62dea1980705b58548b44e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PTCN10100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f256708299e7c1c3ab9ff8497945f325221cd3f948f1fdce59ad2234ad527c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/PTCN10100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdff5759f889285da4ea608c4c4d4ee40c0084daa16a0e2852fb2a28fc29f5d3. 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/PTCN10100009.