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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b9ed39d89a9f43e833534d4e0ab2b79385a721325fdf4e4adebb41230674ac. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/570d2625-31b0-44c8-b01f-f01ed006d5fa.json and https://artists.proofprofile.net/proofs/artist/570d2625-31b0-44c8-b01f-f01ed006d5fa.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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70d88743bac7f1a9084095fb6834c2fdfea8fd47fe5d7a4886c186dcb457997. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BKLDY2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef8ee425db8ccd3c8ebc9fc9408a85477bf279bbc437082d65615f730293957. 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/BKLDY2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf845ef9332afa1c30f8f7a7bd016690c8205014defed1f511fcc4bc39aff5212. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BKLDY2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ac8bd13bc11e4bb4e0f4dc5d7449bb5c550cbee25fc416984b2fdeb009c14e. 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/BKLDY2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc97c5b17980a44df70aea7975fbd3eaeb7eff270b0fa033875a0872a692399. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/BKLDY2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856892ce82858bf9c2c8ed97ebd2eb87bdf64c8f7ff79874989f008b5457c67c. 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/BRKTX2000041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d330159f1d9818a4b64de3353a0426d8705782a5bcb1435be47dccd96ad1d6. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/BKLDY2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70d88743bac7f1a9084095fb6834c2fdfea8fd47fe5d7a4886c186dcb457997. 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/BKLDY2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd741f15f69287d7429596cb164114d608831d2af37c7135f75fcb646842d0d88. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/BKLDY2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f40dde3943ed93fdff49aa30427e4caf87c5eeae64aa0c7a2051d17005ca6a9. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T00:05:41Z), 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/BKLDY2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b7167839b704d212da669d00047769123cfe3b90e065262d20c33f9c623e4a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BKLDY2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02342691c0e06d34bf688018a0d1071acf4d963ea8e743508fbaec87c48f57ca. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/BKLDY2400006.