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 0xa8609ae7e713882b35456eb1f10f9c4dd94e69857f446e527494bd6217cf5bca. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f57f3704-27cf-4197-9794-e519ed0cee2b.json and https://artists.proofprofile.net/proofs/artist/f57f3704-27cf-4197-9794-e519ed0cee2b.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 0x0e8744baf3484f7f04ef9f84b8c0ef3baffcea9cfdf36f9465220a55cc896341. 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/BRZ751700063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d6177f586e24b9802e4472debd244e2fe1945ccac4feeb551fad8365d46649. 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/BCRMH2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18fdb941e7aa17f9085335c1b6bb080d246c18c468c04edc034dc76bbaf4a58a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/BX9MC2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bdebf501b5face8f09bb292fd1effd102c070fe9b6d1c2b4d580e00643a9c22. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BXWUH2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e64529c20132a0c35c6539a33876d185c6a893d9c34034745f341be02feed0. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/BKTCP2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea60f52da935e44358c379138e214d3456f12196bb1a3fab61766778f32f1d3. 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/BKTCP2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c02afc449df543f4b4cde30fbeaa6527fc374478a950c58badacc4b8902d67. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BKTCP2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc122a085224ef6ab2d93318a831f48217d45ae0fa8b356ea1ad281b4561598a. 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/BKTCP2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e644cad78aa2d69be03f043f0e3919229bcfab63d073ecee4db4a0bb7b4fd0. 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/BKTCP2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4493fc4af47ae47a6e8c14a7b52ac91f77effa23596bf90359ebee851b13905e. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/BX9AE2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e42969469c9c93351573e15fe68d7cba3c1d031f0ab1dd6d0770d9f8c4bcc22. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BKTCP2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0ddf806ee9bd8c98c90c455faa3a37cf0c79c8addf9ec6658d797fa5a83e26. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/BX9AE2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47eeb0b6d19227fc0c754f87aad9be977d51627cc3278a122cdccd81b045d06c. 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/BKTCP2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249e42412c4e892d462a93a2535d45c3e7ff191453c1f492f8340e8cc1d4f581. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/BKTCP2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8884bf0eb5401629f8a7ef4169e6baa56cfcde6f2fef1bb0bf4eaefb35cd5fe. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/BKTCP2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3a031febcd97e89f4cad2a3133f4eb124892e264e0926eac80068f3f186500. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BKTCP2500007.