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 0x345219dcbf3927354a027d99a8a221260e57e473953ebd603b3828c8b6ed1ebb. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02087400-f211-41f6-a8b3-82552c2b8dd1.json and https://artists.proofprofile.net/proofs/artist/02087400-f211-41f6-a8b3-82552c2b8dd1.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 0x011366fc2a6bd4e7d7349f9700a9ab34b18ab22ce0befdc23c9a2d2eeefa4cab. 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/SGW502528160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d435bdaa6b9fd568e2602ed46f60078575a89115a1e0270a5afd3a2bf18db58. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/SGW502541279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa8a00f4b0de6ecd25688e527586433798c042c3579d3519b5d89e76d30ca89. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/SGW502539401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9117ba3825a11f5d29058b3d95eb8a9f423c9f1ca43f269e9d9bad7821ea79. 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/SGW502521480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a295ddaf82eb83f3a30c1dd6e21073a3d79338597ac3f7e0966bbaedb7f1058. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/SGW502584322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833a438bb6184bbf3b5c541d9d5c7580af777f4dee9452f1b43fba5c1ed9d1c5. 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/SGW502521582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb5273f16e42a234f4e1385f44b21af132e018d0aeafdd5b7bd83505bd08e0e. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/SGW502529478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802138df2730e29c2d536039acf832513f750d5547f7e0c8c1305f96df49ce5e. 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/SGW502572728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696f816aefb3ceeb8dbf0ac906f0dfd44bdf9508b9e52d37ba01e6ee7250a20c. 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/SGW502535733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94090cd0efcf581d24e5c8bfe35051757dca1f1752d38f4fae3f475d771451aa. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/SGW502563981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc948bad246ea97c06dc2ecc72b4c8ddd925ba55f10f6ae127ddd5d9bffcfc6ec. 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/SGW502575783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34cf8a9b39342d4b12b0d7e6e515d5e15f84c26a4482b00d7c497563477bf19d. 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/SGW502540410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38afa5257dc7578ef13adcac31c136d56153c9b86f9070910a8ebde87921a5f7. 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/SGW502597454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ecf679f2a3cb8bb2dbd479e675d3ff006ef581624f6195d0af946f32bd2e89. 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/SGW502545450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d73d62160516939dcd0f86a2436c3ccfa0a9a0743b912afa123d74e515b328. 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/SGW502529255.