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 0x2caf24f75894532b9f885eb1c363ca2d710620712b275c68ff50c85207f8f0c4. 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/e7ede95f-192e-4982-b5eb-92091787823c.json and https://artists.proofprofile.net/proofs/artist/e7ede95f-192e-4982-b5eb-92091787823c.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 0x7f5a279abbda8f9431706f6067029b56cccc2940370877be856ffdf609d80ada. 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/NL4YD2200194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194cf512d0d84465588a68b8a7fdcb3bd8a04a4a4856efc0e246e3ddda886806. 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/NL4YD2200206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe72a6a545d259e80841ce7b3edc12d8aad460b1feb971168374c69e2433c0d. 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/NL4YD2200188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbd195a2072f27821d3990c5529a4aa0bc9424e04ae9982503badb5d9df4995. 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/NL4YD2200214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c973b6aa160c55a34229314ffd12267182559d5e038554ad6e08b43a97371e7. 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/NL4YD2200218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb02ddbc13df58aad8cf8dce2cbf0d56d0801d010f1ffff86884f9e43b53bab. 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/NL4YD2200189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc59e5887fe341f71a92e674e631c62704c269641b5024c05112ade4b9c85b18. 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/NL4YD2200208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492bc176ec6e1fef4dcc5139ee195d1d129a5f08b45eb8e069a4edda77714a73. 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/NL4YD2200215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd15e65f8c7d3845ef04ca2c1a6369c9d26069397c20fc3137b876f9048ad77. 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/NL4YD2200198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cfc09c87650c6544f8eac431119f87bf775b197ae355cd21da697e1103ab703. 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/NL4YD2200192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a226a664c50c9fd37de1c6cbae86b65cf266eec9a01e0446c9865568bf144b. 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/NL4YD2200209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963f5cff64074e5ec56e5e56001fa873ac6435cf2e195acaade5e80d27c156e9. 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/NL4YD2200190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c92c73b9d9839528b5f5df361a3975dd8723c1edce39903e28eb3549bdab59. 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/NL4YD2200216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320d35f00dc51110af57e1bd025ba1d1c898f1abb69dc32f5eac69dafc94b272. 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/NL4YD2200217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24eace0e4e75d7739bead092ebc5258413a71fe3ba3abe9e888e3a15dae33199. 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/NL4YD2200201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2238a67f828ee714917731923614fd3eb50b0b799b3d3e13232984659103f920. 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/NL4YD2200182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8e836af27b340753e6f0b79373daf2a31d7ddc51e1dbbd3fd163861f16533b. 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/NL4YD2200205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594a6263e993cef79f57d6511b47c6e479b6c7532d2e9d9e0922a0453413e2a8. 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/NL4WT2500023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e125dea979c5348180c702637ef9696ca545741708a5e9a57e9d9a3f199f87. 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/NL4WT2400365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1940ab0a5da3ceba098fc18ffbbf46b2c617eec806e420325d23ca5b0012a99b. 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/NL4WT2400302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae341a8c37e9fd76e379ef674ea142104a11d4854e791963cef193efd1777ee. 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/QZTAU2459012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda40a1b92714b8965dfb7fb311645754699e61d99fdcf508c60aa005ba8cdec. 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/NLT2H2400867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9417ddf88b4d67fa2a7739304d02843690e5704e519b416caff4565deeaadf. 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/NLT2H2400812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff66faf37953c61487dd9591c0b6c2826f22cc5299ad72d008e1c099d4308e9. 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/US3DF2453843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a920d990e30f942d6c8ef0ce53f38c2384c6ccc2bf008fa087e4db85ae8404e. 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/NL4WT2400057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455e2f532278a589b00e08c934e5d1bf1b8f51376a1b2cebabe108390549cced. 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/NL4WT2300250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8642ba427cd8396d0e75f55e2224066814bdcd3a272fa23130ecfb6f48eda2e1. 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/NL4WT2300215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1077d0ac3d6e7bcfd92d8278c3d3a3e534980136f89c7e55d3c10f964e03ff. 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/NL4WT2300165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1146b549edd5592aacaf855aa419d46644e62bd614e2504d845a0d3cb35bde9. 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/NL4WT2300066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfde76cb6b6b75cac0ee7003f03df9e185e5f350f1902c7995126dfdd3e6e5cb. 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/NLT2H2200753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e23087f7a90e96114f54ac52966240f0aa26fd055deab7acfd5452955f160f. 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/DGA062228946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c7c4816d2bf69c3fda9248e310e75c5e1b0a4d0e6219e549322132831a5aab. 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/NLT2H2200258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a7f600877ab5a2a1eba6b809d95fe95ce53f9bd7e7e8a3e0b15c237af2ade2. 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/US3DF2224958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda56e6ac4379d79c19dc52c4defda4e2bed431f6c3961dc8c3833c1ad2fbf947. 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/NL4WT2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa70bd43a8b2f61f10d6ad704ed33b1063163bcdbe19c605536c114105b3782f. 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/NL4WT2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72354d5f5f9683c761e5262ea41724634a8ba0539c7c26c6a16330a96f3e2ff. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NL4WT2000250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94c284fab5ac0b114121709c1a41ff131de8a03276df60500f0d0ab86459993. 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/NL4WT2000231.