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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5eb6191e93c2edbd07553dd0d0c9994ed284989538fe3e7c06350d08dba5e5f. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0476ad4-e286-4e46-9530-bdc2ba4b9c14.json and https://artists.proofprofile.net/proofs/artist/e0476ad4-e286-4e46-9530-bdc2ba4b9c14.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc927c0bd531f82b3db24f837bb570c2d32eb0ad2802efcd096a8929bbcb99ef. 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/ES03S1400519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f2197bae74d88463fa816e14948f2f846028b633583f2bc23777ee71305ce6. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/ES03S1400520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56e1ca84b0236611ca3499e0237afabd8d45d77894f12fd7321d5de6040756d. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/ES03S1400521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc149da78c17899faf1349a8cd32d288373716199b6720898d56899d3b12c40. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES03S1400523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c60b36ba3e999da24f1ce693ff063a9b9f653a57082f0ffac0901236cab77f7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-21T08:50:29Z), 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/ES03S1400524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74e1edb21e5005868354643ea31b25244f42848b9710cb3cf6740600316c387. Chain 2 (Bitcoin): anchored in block 957726 (2026-07-12T16:04:28Z), 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/ES03S1400525.