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 0xc84f05ef4cb56de3e0f993620498cbec95ee42c874e4a8b058301c9f2d9dae06. 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/44e9dcbc-97c2-433e-a6f3-8acf71fab119.json and https://artists.proofprofile.net/proofs/artist/44e9dcbc-97c2-433e-a6f3-8acf71fab119.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 0x8ca7e216100b611e58c60413923ba0b5d901a2270f7a3181bb5d47af157d1a10. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAEF1946560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd62f61ac026acec9d1c80feb15361e0135b4d832b87490dda63538aac401de. 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/CH7812041188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602a084a08c5e7e7c5a6ec3fd91bec5efeaa14b17914bdbcf3b5ce2d8450aab6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CH7812073295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573e3e33da0067acfa29bd4cd229dc66556b08effe13e44bd8e1d9520aa577d2. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/CH7812231232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31df973b5a1e602ee9cd39683544b5b875cfc6237c26eb3a4a2d378c7db557f5. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/CH7812236938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefedf500e27e792dd71e829f9e0b48e785f7ef0c3bdde47a3800ccdbc8af9ba9. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CH7812236939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30452ea90360cb5000ef8bbff2f34996540eb2bde41d95647d5bd89ebf84a63. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CH7812236940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dcc5e1b0990aa1a36cd29e0ecdaf11c587915b2620be87e0cf046b3cec95f1f. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/CH7812236941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6066a74b2b33e58e4d0741b1ccba2eea698dd703d00b21edcbf4660c5a78613. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/CH7812236942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7e67f9538d5ff2c943b0cd752d6f0ac0c39d7e243680018d84b4fe5e51f079. 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/CH7812236943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba4f552a415d34fc97a9bc30220ec3a766103a74a7bcd69f406163eecbe99a0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CH7812236944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ab2d675b608b3c571027d099f7b4a5eebef07cb5157f91234b38829a3065d0. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/CH7812236945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4da71ede9123615f452d770ac43c7a596a56d4779c11c065f93be6a166f66dc. 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/CH7812351565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6941f97b8bb5fb1ef99da32f966f53a1a9c9cf45fbfe72eb1d507ce69bdaaaf8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USZXT2352394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b7fce13fc895d3512ea26a2e4e55e558487193b2aa63e8d9421f0e67ec17a2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBMJG2317643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97f7d21d6690652113c8015143da12500022f3bed9a5b3f76060a1f62ff60bc. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZDA72513347.