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 0x74223ec19eddeb94528b4d44af52ef8e7b5e1a1912e82b74c07c89f0de782e1d. 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/912a33bd-1cd2-4a8b-9a58-977da26fad11.json and https://artists.proofprofile.net/proofs/artist/912a33bd-1cd2-4a8b-9a58-977da26fad11.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 0x1e2cb1c4c1d948ff3ffd5bf55c2d1954a847f3e107d6652f24d3b7bec6071e43. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAHC2323932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537169ffa66581797f47488eafb3d2a9291f1c05e4432e2593273902c9b9ca41. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAHC2323959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb557b6f9b340af7ec8d3d9af9caebfa4bb4c497c700316b00839dc270df41a86. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHC2324000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da1742b840043ce368aa72c7ff578cc2164978f0f5343fd26f1f400cc1e04f4. 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/TCAHC2324014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f80185799046f8fe7671691250d1ca98ddce4fe0c9938b5f25dedbed202c934. 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/TCAHC2324027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7881dd2534e88c58eb7fa23722433c6c49917e76f9d9ab86a854adb8cff0ac3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHC2324034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0804254b96a7342acfb1a24b9a8e03129b3e658fa076e8a18c2df0dcce40b1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHC2324040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76773bdeb00c78e2d52b8742f2ef151c873b0b404e9dda37eb917135fcffb2a8. 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/TCAHC2324043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af96615d4cee722905d92ff696c03c8606ffa902050a8d24373ced29ef7c1f6. 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/TCAHC2324045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c93f318b8b4e8d6af68c5d8c21442bc2109068214b72f3e30229b79e8da0b00. 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/TCAHC2324051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fef3278b4521fdef04fc954a4e991795de09c96e3ed9c08e9d941912f4bfa1f. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/TCAHC2325058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85799fc86ea0ebb756fdc80139e332048338ac7c9c144ec02b72f0b6b900c673. 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/TCAHC2325064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a2353209b25927b16c815adf4a0280862bf4a957e460e8f0a6b1e848325d2f. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/TCAHC2325075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f69fe2416c89efeb42d111d8ef25f3a7d53c8d687a7f4d04181c456685e8a75. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/TCAHC2325083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27507a0f821478b793cebdc9babcb5e814e25433e0470f4bbfa613a2f1ffa7b7. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TCAHC2325089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544704da976891cf3107b63128065683e05bd776b7d1dc2711747424b207db35. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/TCAHC2325094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee91d6e9a877bc5195a51d4fd0384718bf252bf9371b7eba19c8cd4565fa669. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TCAHD2382436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c4ac227e8efc440daf1374451d5cf8e2ec85e970c1edbaec5435ae6e765671. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHC2318387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091b62c98f9ac34ec622ee2d35fd12b3634d56ee43a48501b2b336abefc20217. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAHC2318397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbc2e5984913a2f91b06778a8e1bbbad4d632b4180180eff1a395d5457d8fb4. 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/TCAHB2331000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146e62299b29c54818b75b2840d9d96ef77fd0b1d89a9ba158b5ff0e9f98e97f. 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/TCAHB2331021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c61d6596f3a5e545554050f7036d6d5e2b7047327f1be49cb2087466d3639d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TCAHB2331036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f3849401edda3088b9515efd7a25bd0f4735e52dc752418894daea323cf96e. 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/TCAHB2331045.