thumb|The Baker (); oil-on-canvas painting by Job Adriaensz Berckheyde (1630–1693) now held by the Worcester Art Museum. A baker is a tradesperson who bakes and sometimes sells breads and other produ
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 0x35c8f164ca376f58131eaa00d448b61543c638abbf6c701eb5c15f42a64feea0. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/edada102-99bb-48be-9e50-afad6f6ec529.json and https://artists.proofprofile.net/proofs/artist/edada102-99bb-48be-9e50-afad6f6ec529.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 0xbedcfac4686cc486b9ae8ad564e5393bcef20ce5f67e9ac574885a3f5baffcd4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB8KE2418414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ce084785d5b758acb2c8d9c201e249523a47603f511901021a44440d201b2b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB8KE2418416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d410f9394e8f85a5ba056a745ab86cae4073ba690328382c55678d60ab2e22. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GB8KE2418418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f432635f4c166429e668cdbcc262a68f7e771ccfdb0f59b0d584d874a99e947. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GB8KE2418419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ed26782d814bde1768920c38e0b5ac0a80c7c6aa711c532e9ceb49892b7d45. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:08:20Z), 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/GB8KE2418420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87028c54c862b2ba1f49f075418cfa88252f8b75a346c45dc593163c7c281c60. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB8KE2418421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8adb1c0c8a02e94ad79124e03433d4e78298dd329895e7d7af08e1f08f830b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB8KE2418423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9794774e039871f407257cb85a9f0b9195879d9551ce5d70344d0770973f3b8c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GB8KE2418424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8024727895e4c4c329762093cc0f59a3764675ef1ab15ad100b06dd9b45317b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GB8KE2418426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64518e980b4ae9ead50dbd10f89f13479b5433a2a6165b7a457ca78a3e0f928c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB8KE2418427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb202c4c854d5221882b14a7f74015b610f8cfd455e94a5bb494dde9c47237dcd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GB8KE2418432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1b59d5378376240ca6ca1e8d281fba601e9678b83c811140df2e10a3ab6e0b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB8KE2418434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37676e0bf83125e37ba0c8f570e143e83bb01d7429c9540d8656d9c100192445. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB8KE2418435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d525685ca8009d7fbd0650cafea191927c47a600d14b8a8087346827732596a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GB8KE2202247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb779a4ae82cbcaed763bd4a1fafc802cac18c74ab2bdad9fcef1b58c6890e38. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FRX872125687.