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 0x57a805f5a1fc5f2e410cbf463144c42894f7d88d8d2b1392b991897666fa6117. 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/0d2bf0c3-c4de-41a7-b9d0-949df33fcacb.json and https://artists.proofprofile.net/proofs/artist/0d2bf0c3-c4de-41a7-b9d0-949df33fcacb.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 0x54079078ba3db3f40392edc64264b0ba3727d1754e7000be836bcaaceadda2e8. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/AUBEC2323175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63899e6f2d3628e93ef90f3c445ab64935cba15b0cc8b0c705f015f38e1f2b3b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AUBEC2334145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4cb413978401c2c9799ef3876aefcf413f87ff8c419103820e79bae192808a4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AUBEC2341389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3401b83d3d0dbcff0d51eb7c2f628eb69becff0b7c48aab002adca5f4ac151ed. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AUBEC2346004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc713876d25210bebd8d0b5ee7ea4aaad75e7344df279a4c3e00c0b03fd83cf70. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/AUBEC2351714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0510249a4ab14cd59f7e990434078aa4963b7b81d29dbb5d2c2ba34c7375ed5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/AUBEC2351713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750beb9229427cee3dde57dec7f5bebdfe256dd5814255d7dd67e2a15fdd0307. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/AUBEC2403735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e8cbcd4b159c92fcaafac38974824c3f59756d4503958c097a16c0e1e05c1f. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/AUBEC2407943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c22e86bd15590c8dc0af229cd32d5e2686d2886d5f138fe5cfe11b69d9770c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/AUBEC2415096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd62180e08012390c698d2966a3977e82084c694197e018f6a3c7370a99ad72. 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/AUBEC2420176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597737fc7c3973fcbb689c70a26c1de33a50f2569525494e8aa075024362621e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/AUBEC2470984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3513b6f0870501d2872442d0517e0051f2ccb9454bd2331d91eb5fcbaa2d00. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/AUBEC2490980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55aed72ed270262d110abd0dc803bf4eb0f19abfe87b4d16a84f4626ce6647da. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/AUBEC2528542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dcf604a371a80bc6917282487a5b27f2bd8de7160910236d80cd0b9957df024. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/AUBEC2232382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fc0289cb6cf6727acc4407682e5a2dc63ca8f04008ba9e024e3edaded24f86. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USY242400947.