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 0x77a6197291c25cc455dcd3588f6066c83af0d38a27dbf65886d1057a6a68e85f. Chain 2 (Bitcoin): anchored in block 954097 (2026-06-17T13:13:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79e1eb91-d970-48cb-8bbe-623bc7aa7d72.json and https://artists.proofprofile.net/proofs/artist/79e1eb91-d970-48cb-8bbe-623bc7aa7d72.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 0xbd5060ace6cab27130edd1e68c1d98766c83a74352d8e415563079639314ed76. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRIPN1800033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03fcae6570a1edff0448ae81112a8d3d146e9a5ecf86b74f3bd4920dffd2b63. 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/QZGLM2081774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc14fcdfe67b66a1d8d9c45eb46ded4fca03e4940ac46a76b7fc4a5a95df479. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BXKJJ1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dd45c6658e686691a1f2cab6df6d5b6bd71817e35240590db09a6cf5410811. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/BXKFI2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494f105b8adf846b6e90566f89f93e42bc044477d71ee95ce4dc0f17412fbf92. 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/BCPOB2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb67d294f3a9e4d4c9ff149e6490dcd1cbc23ccede125209dee749bdd3dba834. 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/BXKFI2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa7bfe8b8074af6570a1b6a5f40808d370fec3d3e138af6721b0b02fa004a43. 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/BXKFI2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acb79918a96d3447a5211f81bcccdce9f4f49ccedab2ed4bc7013ef8999d337. 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/BXKFI2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783841c8db79bc6321d20147549e84ee28d69973b3fbd28985f3eebc0818058e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/BXKFI2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52e8b0f41d97ce8e5e0d922141322b108cd03cc3ff5c474dd3f8be8d9338e23. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/BXKFI2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196c43e017459b0d0270a5909e23645e1c35bc954eb15da7ebab2d26c098e465. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BRTRB2072860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff56460563e008cb31fa183003230f1bb2538c796c466aa4e41573324cd80a2. 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/BRTRB2072861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18782a047accfb493fe216cbe0503dc586f8f7d7cdf429c9e0bd6a607985e70e. 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/BRTRB2072862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d5ba38e029b71d9b6abc929d7995bc793cc13a64be1762b308a9d7a3cb5950. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/BRTRB2072864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf629c75bd7750ca39a41fa0d9feda645c148058650f9dc44d275793ecd33a1. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/BRTRB2072865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b043b7d3d6324887510d52a6cb2ba1b3fceac79aca5b20c41a1200205e1ef38. 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/BRTRB2072866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f78d8307fcd7360805676c9d50f13923c416d616d034299f05826f83b89f93. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/BRTRB2072870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1338f82a2b3a479a1ba2da3b9d0465bac55c761c0fc30be6d15257ba90e58e61. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRTRB1962869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1f757afd0b19cabd51aa8cfea344835815ae021daf2cc2ed3bbe523609d486. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/BRTRB1988742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35f99bde2d9ab94bea24c76a3c6609952ac1e2c8f6d70589cf387ae7661ad90. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/BRTRB1988743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbeca8d9b509dc06fe28e09f77ca169632da45ee27fee1c013cf4988727c94ea. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BRTRB1988755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc07f670448fca51a4a76b3ca7fef2be59e9a3b377b9ab878d747031fc1507a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BRTRB1988756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a3a54cdd90dd5db36e965bb781ba2851fbf128ced4e449dac6435cfe840274. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRTRB1988758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9216b0c7a02f75e6f90471f44043bb49123c14d31cc8d8f9a26a8d7ecd84c330. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BXKFI2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdde487df908a83569e39700b1bb04575083b886fcb033e9068043dc2cd0c6c8. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/BRTRB1870751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1464b7cd79c50f101e58b6eec401c352824f159af71bc040474bc4dfefa790b8. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/BRTRB2200240.