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 0x47b0c532d177917cb879b5b8e5b941a36a9ea5204885f56cb8e25e2343570016. 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/875cde74-cecd-4df0-99b7-37f063151207.json and https://artists.proofprofile.net/proofs/artist/875cde74-cecd-4df0-99b7-37f063151207.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 0xb1ed591fa73edc457de019e67547f29e51e14ac5799af48306249fefba0b26c0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM24S1702307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c371c1ee7a1a51dd8d6c492c34f808650682c6fe18c7dc71679deaedace1c3. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/GBKPL1790712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035e4129be54e81244c6d49af1dd10f9b34af5e897b1f5a286565f56b09a49b7. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/GBKPL1790709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd012832acd7ece8bf6a4d242f4745170b255796e155734304f43759eeb940001. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/GBKPL1899418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986280d634f0a856c3a88cf3b58487b0aaff35a03addc2af01d276810e2de56c. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZD442000192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb86f43968d0a5da882c63932b876b0145453a24171b477cff3893c9219d0fea. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZD442000486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bc6f19ffd87ef52583131b5de1861e08bff561df1625e1fd7bee66841de5ca. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USAT22102227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6db5e6dd5fae6f9a1052e38f0786edb140fb51e9ea247c9a1704376de356d06. 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/USAT22104032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bc6f19ffd87ef52583131b5de1861e08bff561df1625e1fd7bee66841de5ca. 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/USAT22102227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081e47232824ed8f58c15a8f73b308b941ae55a39e717a78e7a0803e0cc29490. 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/USAT22106257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61eb7f952f5babaefceaf0e381b454e11b744e90b18c7ea4d06c7ae5a51979e. 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/USAT22105713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ebb0748d10dd8df105dbfc4fad61b5a6a4c8da996e91b314307ffb9efb70a7. 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/USAT22106258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e128f0d96cc394f1945256f34892906c03c524d1f60b1804465394676e7a825. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USAT22106259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2980dfdce67e6b4b195b5e59811a9fca02814b075046e2a4dd83dd9cf0e8948b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USAT22106260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6db5e6dd5fae6f9a1052e38f0786edb140fb51e9ea247c9a1704376de356d06. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USAT22104032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cd8efc04bd3955f3acd82feca3ad625d8cbf4a8c9f93526d8a66fc752fbba7. 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/USAT22106261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9207b84b4e39792b579a2c8c4695b8abda17d3faf1c719a3aaaf48c6a98281. 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/USAT22106262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89be7b89e5b86b20b89fd58b1c356bc1577714a0cc3a1bccfe51f613fd50fe25. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USAT22220050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2a1c6fd776ea53738913100f45e3aa9b4ac1edab5b4941ddf451ba9e701bcb. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USAT22305754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd680bb4477cdec61dfa2f39948a95585e4c8268f4749433fe0992ecfe294da. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USAT22305755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53366d60cfa432eb57a432cecf1f7cae9d2a4c17940e27b91e8ead698631b561. 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/USAT22215022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80c2ea9c54d98b64645dc6e9c68b207f69e41bf5775bc1b26c7d3ddcfbe03f6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USAT22303121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53366d60cfa432eb57a432cecf1f7cae9d2a4c17940e27b91e8ead698631b561. 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/USAT22215022.