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 0x9fba0fea5fbcb5735fb8ed00ead334b0ca6747ce78c0f92a15e51c53972ba9fd. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1993170-51bd-4ba9-9f57-61d14f0993ad.json and https://artists.proofprofile.net/proofs/artist/f1993170-51bd-4ba9-9f57-61d14f0993ad.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x361e3fc68b4b9cf5356055483385ff3b99eefc487eb4d17c752558dc78d89666. 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/USANG2431254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3287de8a5977db9b81f08d6570bd17770661590951e7acc899f18805125b185. 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/USANG2431255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d07d303db176c7953390f0071c06861cbfa468a900f067f241554d0c824e14. 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/USANG2431258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd03b1196bec33ba497e365e3fcb91578d55851eccc729135577d430c3c83ebd. 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/USANG2431256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27f29e20dab083c4c339e2778f684504f887b5d503b11be4a3ba0a12229210e. 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/USANG2411648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66dd93bd783806288f8ba7a00bfb9634e101748bbd4e4af27ad27a000d93156c. 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/USANG2411647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa6835c9bbad2cbfbe608503c1353d296507c955e006781c1f61c9aa2bdf150. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USANG2411651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f1fb3254e168ae188862a9eaf869ec7d9460dc31897f2f0a23118aa27f33b0. 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/USANG2411649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb227f1b08da0e8bb5cb9644cdaa5be03fd7557195e48ac7e591508bd808191. 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/US3DF2470933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0267493f2919ca27db66c3d76e6facb435bd990aa552359f58319a2039499f9. 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/US3DF2470934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7627ff3f80ae8aca66139c594f6f907b6de26833e52fc1ac1ca5c8ea6e1ca199. 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/US3DF2470935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799a7e7ed788b72d0024684f1fc8e13b15ce0832484b409031f92d51684a7dcd. 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/US3DF2470936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc034ba46e57b573359dbee4bd52620c7be3e0c8605ccbe4e7780fa0d3ef007e2. 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/US3DF2449659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc7f90fdd0ffb869ddbafbbd439a92b0964f2e80ca07f77703a5eb87010120a. 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/US3DF2449660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59131cd7f50fac38cdf56e11bb3baa5fb467d8dfe26796a02819ba3bfa6f40ce. 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/US3DF2449661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101cf587f84b5a3dd70b54689b11df49af2afd13637442d861f6177bd23ba0c9. 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/US3DF2449662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662acc350fc859f2825a18097e05f9b98f5f78139e727ec91fdc964b8eb646f1. 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/US3DF2436049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1a5bdb30ea133cf4a0ae7b4b9da39adb81ef738ab1433e49cac82d667fe70a. 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/US3DF2436050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c6b2393bd52990016fc3d0b1bb68defa247c809ef572e58f6850c6aea1afad. 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/US3DF2436051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74d5b6d60381bd0d7b6f27ebd9c67f229d24ddf3519773ade88f0c249ad296f. 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/US3DF2402846.