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 0xea5776cab4218fc862ecaa91fe80c0b8a43656a8e262a500f649f207b3fcfd7e. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2947df8-6ef2-4ad3-802c-a2d9caf420ef.json and https://artists.proofprofile.net/proofs/artist/f2947df8-6ef2-4ad3-802c-a2d9caf420ef.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 0xce0bc01857e020beae2c8ced6ec6d6381cbbc4c15778fd7f17d14ded4a7a7782. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHN72051533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7bddd775f4bc280171a134361579ef7a48c88eb6f204d2393e49c3d7239341. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHN72051534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c991e8484235b154ed76e217eb5af8aeb536adabf3def468041b0444f6acabe. 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/QZHN72051535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524ef0c1938e0c0773dcd3df9dcb14a0f5ce975134f412a994f90657c656c7ef. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/QZHN72051536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba086bf9cb246943a367317a9f269b66d7846b7dfc87348a27cc9a9f26b4d16d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZHN72051538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f69c54e0ea73facdf763db35716d3dbee5a0ed68009d12bd566fd18ffcf96d6. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZHN72051539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19efbc925cc98c036e85fc45886bef0b457d69496afb46afc2560c13b7f853cf. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/AU2E22100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc002d81e8d8ed3d35dfe60cae31e881062d87a8ed0b8d1863ddc73c05a69a7b7. 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/AU2E22100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2945a81e3a62810850ef5723b4eff8dc195c85f23b681764fcb4ba38d3564680. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZK6F2423254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923b7ca67adc05624df7fa30df9707ee7ad7c94eafe5b62df3b79ed319f99897. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZK6F2423255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71cde21612dc3b13efdaef9eb5922063f7c2704cfaace09535d9dc2b1d283eb0. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZK6F2423256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b374d5608e1b866fb357b5c1955f6f3aab94f62bbd097cba3f65fda8f8a26f0. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZK6F2423257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01648dbe1d22630fc15f7fa339f2e23cd9af5b213c97c4d37371fd06f596b03b. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZK6F2423258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b1d94854341e2c233328a4f5e9a774e09c75a76c395457119af95803595393. 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/QZK6F2423259.