thumb|Cotton corduroy thumb|Cotton and woolen corduroy Corduroy is a textile with a distinctively raised "cord" or wale texture. Modern corduroy is most commonly composed of tufted cords, sometimes ex
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 0xf338162685d4639b57e31a1be690cadc5c2428df770fa4b679cd88d36b8a3b64. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6e80d15-ed70-479f-968a-5309e8cfe1bb.json and https://artists.proofprofile.net/proofs/artist/e6e80d15-ed70-479f-968a-5309e8cfe1bb.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98ca19dc2304a8f3afeee9e623b955f09cd5ff216fcde928fb8acd87db2459a. 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/QZK6P2139366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e01926156cdc0638d38d4c3f00a5250e235605bb405d3ba316291df02212c4. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T02:24:18Z), 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/QZK6P2139370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f7341998576d062da9b54c2fca64028fbd1c8aaafb36f6a5aca4ab6cdb1bd8. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/IL1042301751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x530a2f75823aecc82ad98fad71fc5d3791d11654bca2b4bfecde17797775790e. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T18:40:12Z), 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/IL1042301752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1569b86c1ee6102c87944afcfe41e5cf82abbc6321a4e33aecca1a17f9cecc80. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/IL1042301753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710c8cbaf069acfd7f2933564a96e2c71ae61f23d48ea9fdb402e5b6abde253b. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/IL1042301754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a554f7f15000b1b313c484ea384349b9fdf069319cac686331b11947e3081e. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/IL1042301759.