thumb|alt=Diagram of the relation between word, object, and thought|A central topic in semantics concerns the relation between language, world, and mental concepts.|class=skin-invert-image Semantics i
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 0xab57ac19cc305f056d836c9d90b8e5d3b8c07254c81c68434be34615a1146e1b. 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/69827816-b24a-44d0-8e6a-6ef819ea4ffc.json and https://artists.proofprofile.net/proofs/artist/69827816-b24a-44d0-8e6a-6ef819ea4ffc.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 0x7033a64ce5938a96ee73302fb5a2212ed73dfd3ef3d780ceb546cb7d59a4db25. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USDY41817693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d937fed4fd5fae58c0a72ad8ae5d751310a8d32591de74e3dd8fe06c59f4c30. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/USDY41953646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb3abf4a1deaf80a8898bc5547574096fcb882db4e1cebc47eb944218699279. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/USDY41953649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bd9fd1569db236c046f8be10763ba2dc17d6534e1db81d207c5def2f9c0584. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/AUMEV2017122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f91aed473d8c8ef2b475cc3e257e6633f580dcc4381e75053387492590e45a. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/AUMEV2024089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e81950d02e67fb9cd4cf2b01fa378f18ec74b2ca89108a5a7875d20a59e93b. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USA6G1880202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc925d91d4eead7516af46316b69b88939cd1ca86ea23cb788933409a51fe987f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USA6G1880203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70967521090964af6baeb07064bc77107a67d92bd7f9742cb6ea04df068961e7. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USA6G1880205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9feaeb7163b8c0c114e249d441074d7d54a568794dbefed6455f259e83d3d89c. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USA6G2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7f60d783903756a76407357226bb3ad96db8670392fe5edb7aa849015256ea. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USA6G2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6740bd9567e9a0ac041421bbe52dbfd500279a9361518c91a4ca3714ea583b55. 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/USA6G2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6851e3eb99fa9273b52aa6324aa870a109d6db871b04f2124724503718a17f21. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USA6G2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b11bb4de60cbfb29651fc19f16b239eafcc98fac775aa5c9db58b85ae2fe98a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USA6G2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd85d42fefd6ab08c3d67474612a169bd09d1ffd834fd4651ccd324d92341b8. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USA6G2400010.