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 0x59b5b06dcec7e24e4b7cf4f51a7c953b1e3da3dd8b30bd28276b2b855a65627b. 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/d130a0fe-9e8a-4421-bb3e-b54c40e21e39.json and https://artists.proofprofile.net/proofs/artist/d130a0fe-9e8a-4421-bb3e-b54c40e21e39.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 0x5d20f5066afe553d853f95bed32f87feb54af614b306fe32baa4750a781c16e0. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/FR10S1648842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8052a2477fd9e8b1ca30a7638c7b9da6c4f4d6a9024e0a72f45d37964bdaf9f6. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/NLCK41043403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340eb026e385423f325bdeb64ecc8dbf3e42eee9e0bb55fdfb0da2378ae4faa7. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/NLCK41043405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7b6b1f8ac0215e1667a8885dcb8fc8cd4dcc96ffeea701658f9c934447f352. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/GBKQU2033097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47054fdc1099329083641a34b0d1397d1f76776d8bacffbbc699b8cb978bbeb7. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/GBKQU2033099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38097db8c700c652c2347465667144bd99c26cffa28c6af7e19a239120aedcd6. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/PL70H2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382438e387d3ca8e747e5bed83944b72c37c6a7405cf4a0b79c9ef0728bd45fb. 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/PL70H2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3f922f900c51d5bd001b19d43f0aea3d8f123b359836aafd27fd97b67da223e. 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/PL70H2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3eb0f35a234dee773c423e630be2ca65c53cbcbcaee0eeb8bf206af20b97a6e. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/PL70H2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af3f48fb2efdfd550e7b23bbe7b0c76c5a8ce3076d41506994504d3036a8d69. 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/GBLV62413276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72f8ceb2be0dafb0de7a9867e5490d03c6932e3f66a4503601dbee17141ccb5. 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/GBKQU2500601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291373de7cf95d918e15afbe54aba183499644f745c1a154a93ba44707a731cb. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/GBKQU2500603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2271298707667e3d82b84eab8e7567067ab193380fc1ff28192c9c0cb74ecad. 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/GBKQU2500604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfa40dbfeea23e92c3e11b72220e8ae41a239b9cb5e1a810ba2262753bdd3ad. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/GBKQU2500605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb619a5c5a34a46f350b191673688df8e3c0e8ed7e2d388a8744a834c42849242. 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/GBKQU2296174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fee27c6524883bd0290671b6e3bc789483f3b109f6df61e589dcd6470e606c4. 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/GBKQU2353149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb619a5c5a34a46f350b191673688df8e3c0e8ed7e2d388a8744a834c42849242. 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/GBKQU2296174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af3f48fb2efdfd550e7b23bbe7b0c76c5a8ce3076d41506994504d3036a8d69. 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/GBLV62413276.