thumb|upright=1.4|An aunt and her niece in Tigray, Ethiopia thumb|Isabel, Princess Imperial of Brazil (right) with her nephew Prince Pedro Augusto sitting on her lap. At left, Isabel's sister Princess
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 0x18fd56870d2e07d4bd911f9a9056553a1cf3f63da372e982ddcba01a209bea29. 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/eddeecf7-4742-4b49-a356-a2a1810218a1.json and https://artists.proofprofile.net/proofs/artist/eddeecf7-4742-4b49-a356-a2a1810218a1.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 0x35d20ffe002bceeea1bb2686c9dceae5db18f422f13cf2b61030817470655eb7. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CH7812232773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3bfa5837af455cf9569b77bdd388ee993778a7394d2272e4a4dbf03ab2af7c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CH7812239573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9481c1fb5b9bfd271b42504ed65377ddfbd1dfb83d15a68459bc0b76e3391eb. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/CH7812239577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeffddf8c106589e386bb3c147b40c743551c09f8e1e6528a66dd678134e5814e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CH7812239578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd30dffbe431eef6e3d59ca782e7287b6d1e5bc86bbd38ba703b5230474776cd. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/CH7812239580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2cbedf6d6b1551fe283f88d40f2d29f2f1d85a365ad247bb2327fc0be15b21. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CH7812239581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c85ac720c00c89d7cb24d28da06ec05a479bea61c3b2fe9d247097b84a97f2. 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/CH7812351729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe448be67ece10b37dfb98759b1e90f0d36af651c37bb94639c5ae76542a4004b. 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/CH7812351730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754590f92f22392f4e5fdeda524a9f484b0fcfc12a7eb4605e77e8fda064390d. 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/CH7812351731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a534dda3875cbd9808ee3c590d8649feafc3f2cc80febaf689e219b5dc1193. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/CH7812357913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c014279e26d5700f2d91d7f29a19846a8474f62322ba2bdf769e5044d48a297. 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/CH7812364667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c01d03e6e27f238c3ae3f1b0e1a83dfd16b55bae895246174dc4df01e9073d6. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CH7812364668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588cac6a78701d0a0226c87daa7f081a47bfb05c7a5f62a0ed42816f911a30ff. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/CH7812364669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd847d88fd6e236da10cc19ddca2ad58c8c116f0f813cb0a7adb22ed40a84d80. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/CH7812372950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b610267047e0152d2502754b879c13a6fa397d14ea40df47668ce6c1b6cc559. 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/CH7812402096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213ddcbecfc0200662961c7358137df697ddc5f025b27001d8ad9933eedffb5c. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/CH7812402097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b31704ec96813dab79bf9b72aa2558e336369c35e33c521ff6d646f47a20780. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CH7812410999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46f6dd6fc516649025658cd0dda2df58a06e1a5ebc9744fd8a3e38eaa8734d5. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/CH7812414581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9360e05edf65e1d1c995d6d612f47a29d09819a0855a4b075051d6693e9c31dc. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CH7812424952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd3447ccd9cb4cefe60fae08652c025f4eb7cd13ebd6583c5900c594bfa3ecd. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/CH7812531023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2543762ddb3c74724f93e3990dc16fbc395777fef0e713546fe172d459d563. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/CH7812534348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429c93900105ee68d54362f25eee9e924e8572ec7a5f16f23bc0deea11749939. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/CH7812534350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6477244c406276fc343efd12781afdff62ac78ec1f9ba8820900e767f07536f4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CH7812548304.