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 0xf254f7f0402d621d0a48547bb1d4ee7eec018f2898e34ef1d4fb5d226a0e258b. 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/e5e55f1c-2c44-42df-91a2-ce2cbd0c7299.json and https://artists.proofprofile.net/proofs/artist/e5e55f1c-2c44-42df-91a2-ce2cbd0c7299.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 0x059e46b5ce2909f37a6890f008727063a7e282814339a14d02c7574ed4e988c8. 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/DEW250201104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bab7efaf963077032270d6c76d881dd4c17773e9edfc737e70b4787b90cc029. 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/DEW250201107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ed4b812e92992297eafdf0215e0be40283ffc63729fd7bbfbc2226c0fd542e. 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/DEW250201111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92bd2c7bc30bce0af963f12734166abe45f573354dcbbfd1f2cb877774d15db8. 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/DEW250201076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204f3b90378c65ab7c3b8c8e4a09871cdcdf784e4b30e485d550123483ace14a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DEW250201082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cc5e12ecacf67ab96a8db6dc48f411fa36eff0ce1378dfc5deb7fb481b2167. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:30:12Z), 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/DEW250201083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb910aa038ac819d9ce212adbc110c41487b147cea5ebb5202425b908c4a2cbbb. 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/DEW250201084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5284e6dc8c918fc55d68df70ee0fa4f2b47182e0b4e207b0f3310e4e16a3e9. 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/DEW250201085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f923594354aa56087846cfc2037a5e5ec1e6591c39b3ba675321ad993787d6. 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/DEW250201086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7479e2c5e9f9bcff5b9c04bc7b1e220ea5920f38db1cd6599b7240f7c5e2aea. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEW250201087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fcaa762b78305d8e6005bcec3d3b17a1ea3cc607b6050099ece2a84adac70cb. 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/DEW250201088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74d20afee92cbb10e3d1b5fc9862e440ecc95b08351f6d697e63d6fdaf0e66f. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:25:52Z), 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/DEW250201090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc833596031643838d31144b1068c013e21b9a92e05020079e6a6580bbbb3fc88. 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/DEW250201058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3d2a007d78260d02f249a85e65a06a9f34b3e920203066c04e0c50f9280086. 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/DEW250201062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb113652c9112c7d53dc5ca2fdeb08dde4771fa9065c1837bfb04fd38beec79b8. 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/DEW250201046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73d5d69d388be57c48e84613afa1d87e2e5c2b8810649e7c4b6707891ba456d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DEW250201055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652bcc4df51a4f8b69deb2f8f1a7e9834a788d2be7128b873d4701fb7eb2e8c5. 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/DEW250301123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f524e1b4fb9240bfe4d42776dc11dc37a1b34340a426ef2d3678306ef003125. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEW250301125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be0516c0b2446a306928c11083bb87fddad912d101646a18006d53f4a46015d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:55:29Z), 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/DEW250301127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab23371b37ad4c75051ce4ee53d802aa693b5aa278bebc9d8c324c93bf185faa. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:07:22Z), 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/DEW250301128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda68962e8deb3e95a805b3c9b0fd02dfa53f01af4dc3b1bff11c9b5f069dd5f. 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/DEW250301130.