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 0x9c6124484da72f55dd267e4e2b8e3ef3f50d66e83267d5e838a5b73e06078c4c. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1dbe8639-54c3-4eeb-b0ac-703a5e2e687e.json and https://artists.proofprofile.net/proofs/artist/1dbe8639-54c3-4eeb-b0ac-703a5e2e687e.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 0x84ed4c25b01bd26c654f9ab1a8b7f741a993acd99a0c82479dd77ccbdd90ed4d. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/BKNU22400098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1bfc3ffb08470634bfc65f061bdc41dc7e5446d57952232230cfdce9b63e9e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/BKNU22400199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a19afc81fbc31bfd522d6138813974e979ef625982d8d8e56f998ee5a60fc8b. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZTPX2460241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708df3af4502bc67b30ba1412eaa3be82d0c6cb8002c28c011a9d12064c8e219. 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/QZW9M2403673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f28917c404a4297f78f851ccfd1435bf8db27091d6c4704ca0dc5418ed45be8. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/BKNU22500074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dca663ca0fad187e7bcd4e88765ce136bc1eff9526641c89f4ec284a8275201. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/BKNU22500086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8772a5ac221c2cfe489124004bb0a6f19a6ad1d4b90aa3d3cae6b1ea9f81e51c. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/BKNU22500113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fbd0b9a26bcc704d10db48bac4f2644d21c69d024a249cc51432a96707a8da9. 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/BKNU22500114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7f0639ce01919ef6ff6abd22fe8f379c445e8fb1f57b4bd8135779dc8bface. 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/BKNU22500140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03556ff5173c60a749be0403fa3b942bc8dcfa894612ab4f4c6d3a30192f1c3e. 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/BKNU22500214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3434dcb5df6d9480ef08cc81e48e2dec9cf9b296cb5ce5d58833051c6aea2b4. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNC62502180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0961ab15d32ed9bad6687bc93c10cceb63dbfe84effcf925caef0abd5dc6c185. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/BKNU22500273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec350d7f1b6e29054d7fc15ae777460c0a51b3ed9a64eae819cbbecc048c2cc. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/BKNU22500391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0956723b0eead7f0df013b0ab8d2cfad8801cf12b5e835c3d5adf091bc74c38f. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/BKNU22500411.