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 0x2d9c6e1eb1c9d7e8b933a608a5a4f5754f337112eaf24df46462ca4e2cf7ee33. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4094a9ab-13f8-4fbe-9be8-f1a9f333a79c.json and https://artists.proofprofile.net/proofs/artist/4094a9ab-13f8-4fbe-9be8-f1a9f333a79c.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 0x0525ef9bbdc3bf6411513a99642e4de9c5907cf653636fe12174a490e14119c1. 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/QZS672177557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2f902000c03d041e88c795213f44605894e546916737e11ae9e6a6731f5406. 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/QM42K2136585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb005d3ea7a59debddc9739059774442e9730059160def915a2f172042370cf7. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZMHM2063452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6e0bb99336f3afafd4756aebb35582fcbd4d9e6ec8cd84f554825f34c459c0. 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/QZS672168722.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452fb103102430b8428249c91e97b3a037aec2bb5a668ec2369fa42465c89289. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZS632125978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fb22ce3d6ebcd923bd6961c8dbb774fa0e858cfdda4d4d06de090f0b09cd35. 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/QZMHN2245926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9cd2702db3ccf0cdeb9c47b02cc1f88705fc1313e190293d1766bdf5d12804d. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/UKU932348007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd80725574fd7eeb4a0d554788d71f3b6a5ff88ee31885db329e458af59230b0f. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/GXBNP2308894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4711733bba8ec4d77315b062758c35370ee2796f6d5a6c4b3565e6807c39dd. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/GXBNP2448636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383c5f751b562e79c7f7f93efe3826d681c0c712a5fbb7894dc7c6abd457a721. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/GXBNP2451187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302ac504b8f6fa4aaef9a7400880b80a80695d4682e197308af72cda7e0495f5. 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/GXBNP2474040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91dacb4f7d693b50477db0936a9024eeecca3d05579cdd25f218b05bc58601b8. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/GXBNP2593373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1537e01787efdbc62738428772cf7484285050d60a5c0c4c597a963f1d2d977. 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/GXBNP2596989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23fc4b8dd3ac8db0ac2664c684cee3966933ccb1cd8249f9dcdc83fa5ef8cd66. 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/GXBNP2539082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafce266d08311649ab00cf9a0aab6d92c65271f092558fc762d348f53a673f3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GXBNP2549428.