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 0x6f284a6a79486cf04bedcafd020c99fd600d4f14e666b3470911c71d298c387b. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ac152bc-e27e-46b3-a289-0f73f1d5daf0.json and https://artists.proofprofile.net/proofs/artist/3ac152bc-e27e-46b3-a289-0f73f1d5daf0.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 0x3616bfdd1eb614c44e8f505cd09ac50a99fba73f6702b69ac5649c652c604159. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTAW2338394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615b3b58206a149ee925a5b0196dee6ffef1d8da8eb1768d4c4a023369cfe32b. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZTAW2338395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66072516401421f91a8e8340901888dc65840701c4a8eb9ed2b256b3ec18d5f1. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/QZTAW2338396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5af94adb201beb6691317749d39bebce71cbfc5f17c96872a12b20224927d3. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/QZTAW2338397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20988b7f4c2542120a64ea3f9191cd32acf8b4d42bbee1cbe1d868ed8e168526. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTAW2338398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9a939fa7b2e49f16e8a596d2f37bee9317d015eaa5d9abab905edaa1b2ae5c. 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/QZTAW2338399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a8b3817e1bb7589cc8a1c47ee17acc0d482e1d2ae1405d5c1edc79b847b3eb. 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/QZTAW2338400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6462a81cbc1960894b257d43d79fe7786a068d73d192426794211f6fab07ae. 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/QZTAW2338401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86bd445750fc11ed49639b171eb14e4ef8c48e3108b08a3a3ed210f2c5ee6159. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZTAW2338402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7c635e0668e3a9e75e5169f138af84d61e55e60af09157b4b3e33d4768b07e. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZTAW2338403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83efc529136334f41fae0651e5787aa4e042f2d49e5315925ca482731fd893f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZTAW2338404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d1b4b18a11a316fe5d4eebff9b414e5bdcc93e96cc1a0701f1ba3845788ea2. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZTAW2338405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e8290eb5b4f9d8edd6b0abc54a4cd6b0012babe671993a90e8c7984c4e628b. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZTAT2234159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf245369bcfeddd147bdda23d0db7929076b2e32faa27d89993431f322043c11. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NL8RL2404448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f1be4ff9b5263a755550532fd6f036d77143fdc6ed71a6996271695d544bcb. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/QZFZ22432025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d1ab391b4a430a0d7500411eebf4389a4415945f820972aa7170d1cde3bd01. 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/QZTB72352184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1c1bc6e94ceb532cc2e5b5f7662c3b33cd5925675108525b560ac27fa99338. 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/QZK6N2379871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78ef3e18e48bb85c5299bf1217105d7bf5aff620d995682ceb9510f878f58bb. 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/QZK6N2379874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f880867972e3c6ddd2d50d219e09471cc00dc945a0183f865db6cdd76aaf6a8. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZK6N2379875.