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 0x9b69efe23509cc4c53c80356f49502a910823fcb04d8c1981c8d9dbc1c0f00f8. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e790a528-37b4-49a3-b611-9d6cff8b9843.json and https://artists.proofprofile.net/proofs/artist/e790a528-37b4-49a3-b611-9d6cff8b9843.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 0x2628c0edcd5f9b71e6927f7b285795dd6a7b94bad414bc8722ebf3399bd6071b. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/US5NR2332803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856d138886d8c2f47f9aa41beeef6d65eb1fd133ed1238f78a042ef671bd06aa. 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/US5NR2332804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2fdcd22057fcc318ceadfcfebc449ddab603498787eb529736af9600bb5502. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T09:53:22Z), 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/US5NR2332805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a3c4395d906300948ec5edf1fa3d5799907873b52af224284b2d6e3f7957cb. 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/US5NR2332806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52873e0fa2a8f1fd1b33b8c71adacd47b5a6d74028e1d668cee87eb98b9b1e1f. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:44:28Z), 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/US5NR2332807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e99739b6cb84ea518bc83104116a4ae5056ee4f8471f7033f539ccddf1bef2f. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:51:32Z), 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/US5NR2332811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6265278d1d83c836002e22dacf29bdeab5bbfdc38053be0e03c1e8b09adc17e9. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/US5NR2537212.