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 0xfb899ec55339caa5415de1e0e1e940337529064c0d100147b798464c63f57f8a. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/604c8400-2b58-4314-9268-0205dd52a819.json and https://artists.proofprofile.net/proofs/artist/604c8400-2b58-4314-9268-0205dd52a819.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 0x07a8b39ac8c1758ba39b5d6cf9e00a9071913bfe307999de146f3ca473eae371. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZDA42255303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a67c42b2637f22ef4fb7260be19604a2deb927d55d763a3ba747f4d920519e0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA42255304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa655bf95ef3479b1c107c1b2aad1db246444c285770c13af6691c8bdc9c1f494. 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/QZDA42255305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951e0fe5f70c39eab33012037d73826955e599dfde6a55cb3e76d1a1b4c65b16. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZDA42255306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59564c6b1ab94353da0afa175d79cca0148ee9e0772ca7bffa479a73c3f4f57f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA42255307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92147f0e08cbe4be3038f7e2c2ae0b4d369031d092f997a84fd76ce09aac9c7. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZDA42255308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7613dfe0c27a0e4ff7d9c8704e6ca409de5f3db54f1d8b7a751a453f281e9d69. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA42255309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d69faff538ff03f66c41ff88c6adc52adc2d77c8e9cedbc8fd2adc387523ff. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA42255310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8045e5092e4d3cca0ad400d704d1a604ce7da1c4c6dc0ee0c65d317abfc27576. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZDA42255311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c6d6b6f22adfbf70be658d22d5e54ed6bef03b18d6c294901fdfed687be5ae. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZDA42255312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2b47e0d4f42f7d04b86777b8f346848134529b86270959bc2d07e340829fab. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZDA42255313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d1a1bc234505d33412c57845eb415666c82b52677bffc758e25a73dad79eb8. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZES92447262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b17d2eaf22ec53e1c9c2c26524715643e381279f3b28bde4f23541126d981f8. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZES62589223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1fe017577bc2ee5290c18e6b58f72a6e4578747f83a787b11c4dacf1fc346f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZES62589224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4798547254e058b84f9ac6177fdb2b28c0d002331dbd2e5d538df199d61154. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES62589225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96af1f7f054525864857b6558f6378fa4ec3ad61342d2bf6029b53738aee298b. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZES62589226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75902f5e7feca0f521015abfd82d96d75f55fd0fd161a91289c516715c67ac6. 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/QZES62589227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a6466f47174ecc33a1cd3fc38a255b9bf7750c3d5b72dfa21d7a5d001044b4. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZES62589228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72e58898542e2f08985d280dca5ee34234181adb6971e2604142073de7f50d3. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZES62589229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9afaf0dc2e920be840fa7ef1f7eb0b7310f6a2f922ec19925cc76df3f1dd9616. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/QZES62589230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec1799a70023765439b0872a211d487d25d0ebea2b10222ba5f011d52b2e4d3. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/QZES62589231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39e7c0059f0976c821f5399ac34d91eb9d4e328192f4e3fecc9fcd21ce11c9c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZES62589232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d5ae1764c83794fb286fe9054839379f01fbf007796f19f882a77c59ddaa4a. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZES62589233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387b467ecbc71eb1e4fa0a3db0420695be66cb425b57e742e1974cb94a512286. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZES62589235.