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 0xebbf07079fb74461c2774fc1346bc0fad8064a8f718a0994a37fa7c138e8ebee. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f55c3daf-6eea-4a5a-abd6-0cdaa7a8bfd7.json and https://artists.proofprofile.net/proofs/artist/f55c3daf-6eea-4a5a-abd6-0cdaa7a8bfd7.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 0x2806844f3acaf8942d8c0d60df69c5e494b6d1ea933e939c3562d913dfb92fdc. 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/GBBKB9927002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439d06dda575031d5c2f836378247f68d70c25fbdb3bbbd61b0317ef633b8d48. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBBKB9927006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e13544b455f71eee2601f282bd60e83afed09ade905007e31af21dbe228e9b8. 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/GBBKB9927010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c2cddf9b9ba5594adf83abbfcc676eaee8c19e7ba325f180badfcb32bf2057. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBBKB9927011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b99b7e12ca478726e0c65fb7356f6d25f13978431230f48f752ade3e01fb62. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBBKB9927013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21c09c46d6486f83eb8ed1f76bc60189f250daac4a32bf1e8dd96644472b730. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBBKB9927014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe275cefda44e82213debc26cf4c6eed500e40b882e94bf00fc936793dd4d1a25. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/GBBKB9927015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddfe42f9bff130711eb91c1d64e2324165a0844f71d26b22e885f4bc4b4c2d0. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBBKB9927017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2c270a7f918e09e43fba5527cf581c672cf943a0db20914e2d99558b895231. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/GBBKB9927018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d3c0458d22cd157b1703ca0f8e900af00c22f12a29db88075e864e9ba45caf. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/GBBKB9927020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc274103612f62b1c9a6522bb68badf16dcb0bdabdbc81e96af7eb192e98761a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBBKB9927021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b46ff557e212fdf9d21f0397d0cf5f9945a5a4cf261ea8577ea363a42b30a0. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/GBBKB9927023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb80587a8fde3b72749d13665d26a1b7a661ff7edad7dd9a870a0e6fba5f08c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBBKB9927025.