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 0xb32060271395db4e373e5126c4863983d19eddf4af8da414e23158e9d497d5b7. 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/66c10aec-d19f-4601-851c-33ee29d9ebdf.json and https://artists.proofprofile.net/proofs/artist/66c10aec-d19f-4601-851c-33ee29d9ebdf.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 0x257a12c959900c52de77da0651767501ebc8a7c83b93276f7b5105879a5a625c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLG662000241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3faf0fd4532c240420cc8892e5e0d1af34829137da16439538aec787dd80629. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL7EV2200061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331c8cd04be555ac71ce9671ec5262006efb5095ab6043e421d7fb7f78c3bfab. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAIP2431292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1eb286342e3130a7f7e1095f57e9a5f10342a88935cf5e84110e99dfa957de. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NLG661800958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6e406b9e29b51b2a8270cb7c764b8d1e402f84ea6b8bc4668185e621777ea6. 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/NLG661800959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99cc8436db744316001a9b1d2789e618aa07cc04cb25ef24a50535a71568626f. 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/NLG661800960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe60fe69aa0eb06cd0c74e632c52f2bb214ffb83f330471e69ff41bc9b8fa84. 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/NLG661800961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef4cbdfca6b96957a56882123bf21877287d7f81d03b43e79f2683d2b159ba7. 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/NLG661800962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb99ce30ce8817181b6e310502b0c7200e3f1a55597525e8f1f799b4c37b8c99. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLG661800963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c9ff59e2ff792b175b7c8391b5dff19adae936e0b175233c436dd00d916c59. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLG661800997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e46a18b300e87fc2ef1344f78df04f84b41717948505a1d7a9bcdb7092bdc07. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG661800799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4782cf16d6ada66074eea941d1d69d0b365b436def78822d340ffa16835879f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLG661800965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa929f9b4dfab70004ff7c51c313677bbd79bba5373169feacd8054f4f01ce5. 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/NLG661800966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926629bf8087f8cc9b9da1d7cb58f84e5f9df872c2dbc7f64e6869e0047b7412. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG661800939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac3feb254e1eb8b9ad8e6916b73517568d8834b6095437626a1d1dd301eeeeb. 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/NLG661800967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49467a26356af981a8995e2a85a4c8d29a3181204299fc6b0f2282755c4087e. 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/NLG661800968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a661dd5633d1fbaba8c386ec810bbec6b050052599c0f0e84bd54a6929309d4. 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/NLG661800969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6998e720e12831cd7cbf0934a471d5761171a4847e946435ff941dec29859614. 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/NLG661800970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f931c91e37122acac08b90c993b19dc907792f1f3a544bca666125bf8bdc87. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG661600483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ed4f95e5d463337155c3e49fca376f9f947bcfb8af335c8ce7d1ee64c5ffbd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG661500215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647d0d4636c6c21c2833f2d3d052ab0ee00b9358ef0124aceec109abb56ce540. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLG662300692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa30a2c7dbdb96dd59319bca24dacd4ae197044e10d614a3f83c41a4b2b6a21. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG662200261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3faf0fd4532c240420cc8892e5e0d1af34829137da16439538aec787dd80629. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL7EV2200061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fc1a4ae98ef9cb2204f7e7580a15de68c3b0f4200c3d5f936afc8cd29caec2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG661500226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c8a4d02a1fc96dfa5423343f73bc4cd90c658c89edfd0a7deb5f9278d08436. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLG661600663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35d3f0b5de0b164b1f0d9001417267324f77e0a15aba989bf70cb1e53669afc. 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/NLG661500220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7f42cae0daafca9ead5728c6cb75f06d88ea1d5ee009f30b67423027d9f7f0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAHI2370279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09b1b8b8b25fdd1e052cd2000aea35c163d0bab5daec94cd103dd1ae41a2fac. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG661700540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e2581811d81f279a42628e1907d76553196d74adf02f292ec710a49ccea8f1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLG661600644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bb5c016b235871eb4c6ff011362e40725863c495a4d524bc632832273872a9. 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/NLG661801012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb79d67f0d91447bccf2d33b42abc1fee48728f28d4085d245d3b46f4b1b63c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLG661700534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26831126bfea2fa20da47ec532c5c17c1f0c4d05e2e3851f2012824fafc810d. 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/NLG661600266.