upright=1.35|thumb|Ildefonsus of Toledo by El Greco (1600–1604) __NOTOC__ Year 667 (DCLXVII) was a common year starting on Friday of the Julian calendar. The denomination 667 for this year has been us
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 0x46eaaf76119153bad710c181099e0997141ffd112e502e7c045226fa36f65d4d. 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/e84d816f-9477-4058-973c-096446ca0fc7.json and https://artists.proofprofile.net/proofs/artist/e84d816f-9477-4058-973c-096446ca0fc7.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 0x6de876f2384481aa39b2c4e76244c83509b28a85702796ac3a2e36f446786452. 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/QZHNA2090708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9feb15499cd140a391e5a5c034364bd5643261ebafdd18daf0a5be3843a65b. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZHNA2090711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e180c4217495d2bda60dba1f9e0c6c699f056784e34044849fca45c503634bf. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHNA2090715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b4d7b0db5cc3ada3f18985efed55a614f1e621ac51300a2ac731529d855ad1. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-22T01:31:42Z), 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/QZHNA2090722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e931246f6b61f1ec000ab2dbb83eeb03ba5e6fb20a9dcf0d8f42d0a41b8bf3f. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHNA2090723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa78ad6e6599790153ffea9fdf6fab655ad4873b562f7afc3c12c684a8359c4. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T11:04:34Z), 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/QZHNA2090725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a58703f32c27cc857a2ce2b7ec1231f26833812e3567e5698b718b218b2a1c. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZHNA2090730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff61ab8bddac78acaeff3093bc980727aac9321a6808c518c72406afa6e344f3. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T22:40:50Z), 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/QZHNB2067085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc5356158773bc189466e853f09ac1544bdb52ad1b0956727e966344d2dc36b. 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/QZHNB2067087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169050f1aa40ead99830c75b8dfb877a123d9ec9115884e8c9b28795fc858091. 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/QZHNB2067088.