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 0x244d1ab0ca481d7fe99ef3000126a7d29c0f0ff72dd558b5aed00cb6e852c7e6. 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/cbd9b31e-7f13-493c-b846-50e704fd87af.json and https://artists.proofprofile.net/proofs/artist/cbd9b31e-7f13-493c-b846-50e704fd87af.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 0x6ead5eeecf7c1c77e297bde03305dae2d82dbebbf3f516f2f758213c904a5916. 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/QZDA52036872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf065fff3fbcd3ed4016c61baf15bc2e92d1ef2f50c237a3d281ba0d70a4d773d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZNWY2051353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520fff095f7509a093973a583adcfd712d552d12955b0a843a70c8a96323443d. 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/QZFYY2095825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1419d2dd1e780957473978e7c47080de37bbdfca31673f168887f1eddbb05a64. 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/QZFYY2095826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94243df925c3f94cb5a6de3c9ce11dd3c8e4df2085c28aa31a2172fa1484e635. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:27:04Z), 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/QZNWY2051354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf065fff3fbcd3ed4016c61baf15bc2e92d1ef2f50c237a3d281ba0d70a4d773d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWY2051353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94243df925c3f94cb5a6de3c9ce11dd3c8e4df2085c28aa31a2172fa1484e635. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZNWY2051354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89bb8193c93b256f4d1ce1f9ba0baf18ce8a07bde7508a8fb4b1a3d598e189d8. 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/GBRKQ2199173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d18510b9000d5c6838ae16495feb16820e10cc40d9afa2cd18836f605cce4a6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZ5FN2253308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d18510b9000d5c6838ae16495feb16820e10cc40d9afa2cd18836f605cce4a6. 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/QZ5FN2253308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b04833b8337fd73c8a1064cb1a1b44f583a7373a8b3d0833d07707e4102d5b1. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T10:00:08Z), 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/FR96X2363805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9fa5998029b3e50f6c45cf185ef23e9a280a32934eb3b0e902527ddfe88467. 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/DGA052341582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b04833b8337fd73c8a1064cb1a1b44f583a7373a8b3d0833d07707e4102d5b1. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/FR96X2363805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9fa5998029b3e50f6c45cf185ef23e9a280a32934eb3b0e902527ddfe88467. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DGA052341582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5c9b831293c346f8f066cd57a913ff445c9957776e44306843fcb20ad4d8b4. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DGA062484639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd0c390683e2fbac9c2c4247189343a28ef5e5218e8087e56ac279ee212b560. 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/DGA0H2477360.