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 0x37279e013423b95ab0c96e02a8a64d5390cb89fd7546a0d253435c2be9890fd9. 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/0994b9ed-cb5f-4aef-9a74-edc0ee824a29.json and https://artists.proofprofile.net/proofs/artist/0994b9ed-cb5f-4aef-9a74-edc0ee824a29.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 0x87f1b9ee80ad2f23a42bcff86a7b7f87760bb1da3b0f62219650a3b4e72035c8. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/ESA011854598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8896f3f9218789f21ea375737de8a95292a3aa0a3c82d04f3140c6d5a734ecc. 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/ESA011868365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55632eecb17baac36a7aeef69762fda4f3d7ff3351348b7bc0c6c3bca18ed16. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/ESA012223469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4fd885acfc5ff082aed0dd1bac2bdb065d385b321308ca09740e34b5129dba. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ESA012223467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d44ea38f616954ccc9a3bf4b9596b3f7abab0b34a26e15bf12cfc7839710d7d. 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/ESA012223466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00d8aa2e791e83d9499963e1bb0dd15b60d82995c9c487e65424631711a01f9. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/ESA012229878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00d8aa2e791e83d9499963e1bb0dd15b60d82995c9c487e65424631711a01f9. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/ESA012229878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a55f4d34bdb54cddd0902ce2e681448299417b3096921a2ff4f302577c42db8. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/ESA012229880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194b8d6f17daa78bc26da3694ebe1576c8bed26737effbec0b62ddf5e0339193. 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/ESA012232046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb6a78e1fe032d28c4c95aca74d2c03db1e10af1c5588c5dcf44acfc72c9c77. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/ESA012232047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c633cd792b3f18c64f4238be0c355a4d48faaa903c9e0fae161499c89a41749. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/ESA012232049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97dea80f62035d8edabe6c7a8ea2ebf51f69c6028ca4dabef18dd1931722a4d. 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/ESA012232052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194b8d6f17daa78bc26da3694ebe1576c8bed26737effbec0b62ddf5e0339193. 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/ESA012232046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb6a78e1fe032d28c4c95aca74d2c03db1e10af1c5588c5dcf44acfc72c9c77. 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/ESA012232047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97dea80f62035d8edabe6c7a8ea2ebf51f69c6028ca4dabef18dd1931722a4d. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/ESA012232052.