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 0x951ed592b57c8ef797c5e5b317528d98ed6d8ba1b41f2b335392e776b37c2641. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ba2193de-a792-4180-b867-9b34dad02d80.json and https://artists.proofprofile.net/proofs/artist/ba2193de-a792-4180-b867-9b34dad02d80.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 0x4ed436e01a3111d812a54f8613ee18bb9d315b4f127466501624c6f907527acf. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GXD7V2588129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7466b552ff74d9dc58af6fb1a0f923ee03f423385ce26b0c6a499a32409971c3. 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/GXD7V2548738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe255c25cf0c62f4a2659bee015d6b3cf54b64a16dda3e0163bb0c31a809e34f2. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/GXD7V2570540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc7c7a923b9f056853f26a944240ab5f1f9caeb559169aa33d6d35423e7b5ea. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/GXD7V2524703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8e375adeffb3560ae6cec4c9e767b25a3e886dfa517c0fd4e8976e4efc2bf1. 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/GXD7V2548418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7b46611aae4371b78f2940e81b607b1ba417883443dd69d390328bde6b7433. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/GXD7V2516889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb71ef27cb1aaaf47ef15c09c9ddc94c1f110fc3bba35ea12abc0486fc5a7062. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/GXD7V2542023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4795ac25da0c3c433b3ad284223f81209150322ca0043a7eed23ad332647d2. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GXD7V2566189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a3b0d54222ec0dca3632ee5d1d4a386521f62e8930f71663871e8eefa875a2. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/GXD7V2504116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae764fbcb10ebe6d9a07fe4cc17c36303c351d5ed8929e55e90be5cd724e626. 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/GXD7V2593777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa80ef4c2991629f1dee5932d9c8750e5ac335f595a64323a4aac8c7da61cf8. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/GXD7V2501671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc7bf3d85acc226bf68b029566f2f5a79fee341895179cddac71ccdb90e9a21. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GXD7V2553165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680780cc8b757fcd326fb7e80838a0a21fb17f1d7a65002922ae25638abf986d. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/GXD7V2573406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adc10f19dc08b9a23824fa1920da3ea9d376468c392ceec76469d827367d43f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GXD7V2571732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c1c227ab0495861be6da31e135953ab7d7d27aa13f222e499d91152215aae4. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/GXD7V2599673.