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 0x7051268ccc1cccae1071eda09f55b961f48535d4858dd3687d862c504fe3670a. 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/066fd2c9-5b48-42bc-8b9f-fb46aefa8317.json and https://artists.proofprofile.net/proofs/artist/066fd2c9-5b48-42bc-8b9f-fb46aefa8317.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 0xb570e94b7527a334f9fb5f6c01c3a02978d713968d7e9a71ee79272a44a8915e. 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/AUBEC2301712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd887363c47fb3c05ee8bdb84fd9108fec33543fc4bb8fe6cd0e24d753628fa8. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZHNB2173866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217042c94e51a30323b46dc19b3e94889981c4784b81c408e87c2bb796cf3b16. 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/GBLFP2203911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e40f51611cdec63ef504e37ab87b88ee025e1f65460c12724394f51ec7cef48. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/INS172302322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d398c8346e3053d0e08afdd67300c63e778d7e634d171e8e58e39c2d24e908. 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/QZTAY2392434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a56ae0ed805d21092522730f499c9c6a81bce70993d2dc2b95436cb80682476. 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/QZTAY2392436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469c5b875a79b1db67e3cbf3989134e7bea78e21e4d2ef439948addd36cfffbd. 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/QZTAY2392439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9773132f08be9b18c926951c52ef32af427e09e183f5efc1a8299ee6b24b2900. 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/DGA0Q2389841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648e1ccf9ca6023d2bfbe7ca4729a4232de0b51091e952f287f01e4f18354d5f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBMA22145963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed13b2c3cd2bbd71765bc5e4d757ba4c1ce169eeb41d42eb79b347514c2ecb2. 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/AUBEC2156568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46f414ffcf03c1ed61040c7cbcf12bac184660c234fdb3fb24a1f1a23000ef8. 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/AUBEC2175576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5537c701c93a02c5f95ee0757936b0de1986535ad2abb1d67d35f51d9c776840. 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/INK492300262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510fc1821008aef0b8fa4d90c41b41977956cd665a17c2e5b1f50b7d59f1c666. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZK6H2196144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe451a897398dcc353dcef4cc58743abd8ef147960d9ffe9962e9486e6688dfe1. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHNB2132226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3f3e422ce9ade99accc92e98ee074e6e1313f9e0c14ca668689a3dec34ba76. 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/AUBEC2407217.