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 0x71aefa3575adceeecde970a6440381a19df264d3a44b4fe3447041e25825d21a. 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/b43c7c5a-edeb-45e2-bd4a-e3d08b0569b0.json and https://artists.proofprofile.net/proofs/artist/b43c7c5a-edeb-45e2-bd4a-e3d08b0569b0.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 0x53821f123ec134b2821f5f201078087e9bc3e7fdf204158a9ef8822148e52fa6. 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/QZHNC2313732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85c3c6ed7e33ebe71370fefa91a77316592f8624ed9095ed92f6090bf22811a. 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/QZHN32393828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80507f2c158c390341a51aa3a391341b9a61279d269d5fe559720e28b7a42468. 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/QZK6G2239492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b65ce86ca049d2682900a389adac5cf5ab74e5036896c698802c99c4df644c. 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/QZTAT2105733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67af497a61e4104307840da549817108653fe53bdf85a82b31be8cedde3b8ac5. 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/QZPLR2197344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df55007ead6dc04809564cc60a3b441575df2036b2be381dd4beddb6e2500b3. 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/QZNWX2122028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f1a306cd0db7f357fa88a25eb8363c8b0b9dcd7c14e4094b77dbd72987b587. 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/QZNWQ2124106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dc330117318ad3fce25f21833840e0436e6971031955afa674315b2e0772aa. 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/QZNWQ2124105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341e645c8a78ceef53406818e8b41fa5991da622f27d97a9bb15f094f3ae86c9. 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/QZK6L2187751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106180266bbe0c9e48c4155ebe39fb0cc7793525a0d7882865c02e5db50672af. 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/QZDA82197228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5339b5130efef392ec275262bf7f675cb12fc4d13eec0065ab3cd2db633109d. 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/QZFYX2177893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf49b0ddb3b33b8749c82ecae620a4ff43d3e44bedd46966daa04d734d5f229. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:10:51Z), 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/QZNWY2071329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d60293331e6225979ea48c49d5cb09059190e850c295b293c2ef685550afc9. 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/QZK6G2057190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ecba1f1e9c18444d146d86f918ba2df503513c7c4604672441480fdf8f7d470. 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/QZK6N2055473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aee6e4c68c2540488ccb0898b1e70398c8828fba099b9a20d5051c972ab0313. 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/QZK6N2026291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bb5eb5d91390d664ecd50d74234d47b02e561b12c87c6daafb7bf8e51c736f. 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/QZK6N2026178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d381d7efaca58f56a4d51cc6433821d05caaba807f92d9970718c8e0f4f102. 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/QZTAT2429548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630660b8885b3b8f6d992ed728e43bde0ccc165099afdfff42345e9175e463ed. 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/QZHN32433956.