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 0x9c48cacd83cdc89f2a1ebb4543fc44f015583af685e9689faf4eee80d69993b9. 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/25a92f66-cba5-4917-85e4-42403899fc0a.json and https://artists.proofprofile.net/proofs/artist/25a92f66-cba5-4917-85e4-42403899fc0a.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 0xcc6c8e17f173e9d1765b1aa1e48d908fd194a7828a9986bece521246cc1b1d55. 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/DEZZ52170362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5c3c1f42d26db09f3c023fdfa578c45f12cc97131d6e1a28f90d1b88ad13f0. 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/TCAFK2124381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b49e96348f93b38b441a1f1179218342295a6574245dc7864bffb1b0b919ec. 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/TCAFK2124383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb8429386aa95aff6d1b3283e4f5e23de72aa50ab6d6c91f325fa7e91f972e0. 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/TCAFJ2187656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2455fd9a75517adf66a3839f9e09bbcdd61f91476c05f9dcbc76c555561a249. 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/TCAFK2124392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2811353446131bfe3795afaf9b5497ca55c5563d74e85ec98600080216e555b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAFK2124396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40994b3ff7800e387095628c5e992741e5705d61af05a699ba8f4daa052d26a7. 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/DEPI82436311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfa5f5a7014ef59eb3bfe742126cadf57c89c71acfc27b98d30e2bcdb64dfa6. 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/CH7812104263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb324a0e00fa99de23aa9e2f84a7b4cf633b211b042f7c55c849918023953fa71. 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/FR26V2071887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b50abfd49ac1e9b1acf0c727b22dff1df252c5795f81de7a17e94b23aa0c6b2. 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/FRX282003344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf394b995e3dd364a7707f6f9af3505457440ebee9ec0a8ffdf8159977b0c6a5f. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZDA72011311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe208cc124b31c4ebe64840ce0c57aacfb6f7dc60dc2874093fc45f04c205fa4b. 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/FR96X2071794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587bddd0b8c9e345fb3af47c19031ef35d7f7eb79d0634d799e54a174819510a. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEPI82302171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7756a682fe13547275c5ac255363433375c4e911f339c40da773c7bfb5654ab3. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DEPI82205438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f79d24531d4348fec79ff5243424410aa94a03a421d0c0d022f3676c109bd3. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/DEPI82018383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbd201c902a38a0b3e6302e8a50b416de9d5344dcf3dcdefe18029a8a475b7f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DECE72100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeac9a5a472294321cdd06b2a3500fe5d980555d323dfcc0cdbba881e428c27b. 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/QZMEP2408080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9634ac8f3a79781706b9c40b7086393770b712c79e5e4e34416c55ec9cc68aee. 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/DEZC62005737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9634ac8f3a79781706b9c40b7086393770b712c79e5e4e34416c55ec9cc68aee. 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/DEZC62005737.