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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 0xfd7f29faa26f89c4a03f137cef55b2fba3ebd1947765a765741b27341c9a5cd2. 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/78b8fd7a-2987-44da-a072-7969508c337b.json and https://artists.proofprofile.net/proofs/artist/78b8fd7a-2987-44da-a072-7969508c337b.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 0x5e00716ac81298fcc44490bab0f1b1bfc8b3d46dde232b65b1e8e1ff52e43584. 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/CALB81258101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0a73ca02b47b043abd87ef429bcbafcf8d58465202293f692a1773f40a11a6. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/CALB81258104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce943f5b36d0d6eb670134f51aac37298415f3b9bfb2d02215f3e3dcbc92957f. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/CALB81258106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba7739e0fcaf65c90f778e894e1e836d6ab485ad2e9188202265ee315cd4fd5. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/CALB81258107.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2eb14e1f69d5e4303509dbfa6298a4d2c4d08528a28cd93e0ce4813c278d9d. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/CALB81258108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8423ee6078ab18e3fafff48dd0a333b3e1c8d71d459f1464bc68c2d6a08b43bd. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/CALB81258109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e71d2ab24e61fbaa1521f727f061afb4a9bd19a3ab84ff0fc86a636bf7eca3. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/CALB81258111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6cceacfde9f5b9a267730169fce77c12c5cfbd63f4e5cbe51d5f988ee3229c. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/CALB81258112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec69f5c004098c9726eadce2593f150e057884f0e708aa539111e27cb86ae01. 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/CALB81258113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec755668f3a1e9d54f480c7987e55939d853c9e16f8b819afd17e68e07c4193. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/CALB81258114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065085584272daf47bafaeecb7080514f5635e3523c632551a7a5921c6c457f8. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CALB81258115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216ce0c4107f62ec4d3d2fdb25ae12dcef4b0e3cfda96cdbe4f5cac22b995c52. 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/CALB81258116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ad7989b6532deb701c44bdb78f4a2be3a58eb6af4bf08f034c3132d950bf8d. 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/CALB81258117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa71b776a27976c372626f29cfb79c7b82938f1d097a87698743f86204dec001. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CALB81258118.