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 0x591c0aa9f8f3fa06f691d5ef309e2d70d5aa081444209ba9eb875e884e2cbf5a. 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/0db263ac-b126-4113-8998-01ad6cdde1cb.json and https://artists.proofprofile.net/proofs/artist/0db263ac-b126-4113-8998-01ad6cdde1cb.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 0x8a3d8946e444ea32a4fbd586fd884b9fa83309e4b70c54a253de1f270f31563b. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/TCAFT2149276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb55448691c14e94e661440be81fcbab5c254282d3f45bc96a6212dd0dd60ee8. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/TCAFT2149288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce85656dbd3b90544e6e49342f61c6a7c3e6b7d3f4045de2fbfb929d58ceaaa. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAFT2149294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42763804bfb2731d7536b067d47b88a5f7ed350a84ff09c4593233bcf14ceb85. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCAFT2149307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d15cf0e5c4999b21b683c6641d59ae26ead31ad9035efe23c07272b3763c7f0. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTB72322020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06de0f58c0da3843d89156a11927af0c7002ad9a317396d8f0a93db0689584f. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZNWU2404993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae630b2d56c64e968362eadf8fe547acb9bb004a9d4d7446e95f2b552fb50c5. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZTAU2497984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd835a083917fa3042202558f74cd062466e358b4394c3d81b07d88d5c66ae696. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTAU2497985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3facdd07a9fd9d2111d26371b6f03473a9cbfde1a406420040bfa07ec5013d5. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZWFW2494850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc3639aeb4ada5538792081f0eebed1a06985ea63c7d82a033e86b524dd6a0c. 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/QZWFW2494851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae17a0204026da85bd9d20b8f13b2449662f7e4f45bc65991428e4e20aa39727. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFW2494853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc488e41f91fd87ab10cf2b5934aafcaf4021583b6c8d15be88ba6a21397ab17. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFW2494854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7249117850e60eb7c88911ce69fe9f87346e67b0229989aae69995cd3633f2fc. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZK6P2526173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17549a5113313d6f9a92f7c09b3913b9491e50efcf5a14a38a96b06d630d10b. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTB72590845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f14d3f9e9389aee5ea215131e1c3dd57199dafe63263a9e2a2019ff128958a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTB72590846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80437b3e6af085f4f51b65c45079f982e6e08daf94226aaf547ed86cc802aebb. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB72590847.