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 0xf6f6310c22993038dafceceede12ebfb718a5d664be5e75e8df9b05da9824aa0. 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/e9064604-2f3a-4f6d-a234-d8105945a1b6.json and https://artists.proofprofile.net/proofs/artist/e9064604-2f3a-4f6d-a234-d8105945a1b6.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 0x6198380aab515ab092f408ca3e8a68861b5ff15715b81ceac32d7239abc33612. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7Q2427972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114489b1fcd30a90c886886742d301d43a87cfc76824e8949c209fbab094ad42. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7Q2479224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057fa7dab0871911ff51b4dfc6ec21b9b4f0d44fef93b94487d582abec6ce637. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7Q2477776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc426298c2ea729d3b65ed2fc66de4411ef7c6b33927676d13cc4887de6ed0509. 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/QZZ7Q2479221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35508234a6924e05ec4b3987ed780df8e3c8e49e521fe90eb470cac0f5564e54. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7Q2479219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7241c49f9ae40c5f6fd87978b9487f1c3438658237c055af7cca7916463e466b. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZZ7R2414175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8579bec7b65545638544d5c203555eb93cfac0b69531f68748951b27916fec48. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/QZZ7R2414173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5ea97638fc10920a9090a9c9935612270b21c6447e36961b0ffb01b6f350c9. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7R2414170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d8397da51e4b275451d60de6c726a7cdcd778e3718b8583ae197a249736377. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QZZ7R2414163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd382952d1595fb5c013e5275e02dbe675308ed56f5e3e8b3e6f3ef9072eff726. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ7R2481367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ed4b52e66ee6b9c7dfe651c2d83f274d2a079fd19938ccd6162ff278fcb582. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZZ7R2478268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31051e797f5429238794d3c9d5d3339887d331cbd96b5d50e0e4c01147e2552. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7R2481383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709ea7d9ccf9f70eb2ffb0d9c9eacd741eb980518d53250363bc749e73c6f00e. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/QZZ7R2481361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4a40feafde2c86866acfc61f5dc6389a175ed2c657adbcce4565df04f036b9. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZZ7R2481363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9de73b15e4323b9cf2fc3bfbe28c99cf0b8f3e38a58c2f4dc7f799ecdf57b7. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZZ7T2489099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb035e700957cba81e0d7a54d96892e7eb39866632da900f9f69cd870864558. 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/QZZ7T2489101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5caebcb69dfc32adf4605e0c7f5f33c06075fd7babf5809b017af84755e29499. Chain 2 (Bitcoin): anchored in block 956404 (2026-07-02T22:12:38Z), 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/QZZ7T2489097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02b496e3e8a50a5c61952f55330cff020c973632ed9f1d5dbddf9cfa56035a9. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZZ7T2489096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ed14fd7cf71239856a648d6535c8b92c5e6e4fe9a4bb8b757514c06bf28b28. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZZ7T2489102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fe13ca8e692e3068d11b95de81804f7482ca877a10df227a95a6218a006bd1. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZZ7U2484566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e46a10e942dd052de05522c416c0f04238fbe0fd6563205159d6a2183c0f8a6. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/QZZ7U2480859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd15cc02b83f42b6de47f7f6cbea9ff68f3201da1eeeace2a0f5204f0944a42. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZZ7U2484562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba5da9585e9a51fc0057b8ff322b2a3576302fe09ddf73c6b4198b2a94232bb. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZZ7U2484564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2498e0a90582e1de5257b48401ee1a47a9705022a9f5e58479eab94965f5de00. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/QZZ7U2484558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd402a307c973a50d6325d3fab1fe8e5847163cfdce26a083806937628c6cb9fc. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/QZZ7X2462063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388db25014800bbb87a0e54a4f59a98bb757a3f36b40a8b06c0649dde89d2f30. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7X2462057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdd0ca91ccf975ad43cefb8cb6af2887ef8374ceb22a343c2c3f163ac847a24. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZZ7X2462061.