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 0xad0951d055b12959070befa138174641a1798de176c7a2e64aaae7bb247612e5. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c05eb27e-4b42-4807-a1e5-f4adec07e285.json and https://artists.proofprofile.net/proofs/artist/c05eb27e-4b42-4807-a1e5-f4adec07e285.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 0x023b710a756f9904745fe16872f831a8668458d9ff2f845259d4fa99a801d00e. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZTAY2329797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3157cf4e6a4ae71662746c1c65f83bcf9905bac15e18bb06c3909a4cb64e045b. 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/QZTAY2329798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d694e6610ed49af916dadb602b1acf4179433c093086b43006bfafb084e7da. 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/QZTAY2329799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e17f64deda26165b0959b04c781eda0fc7f3cb29c9b1dd104682a70fcbe785. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTAY2329800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dca06c12bfa82d506283172fc41f92e303c7a79415ac81bb02ef46524f19258. 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/QZTAY2329801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fafbf9b06ae301a9c4c7eb3e1ad11217c4347fd836a8fbc1bcb3dcd87a13e2c. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZTAY2329802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946c11d823e4640911314090bc30f321c520cc73fe5b131f82f3afc16d6edd9d. 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/QZTAY2329803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e79b1fc4eb4730f6521bf22a467b2f614f11d4839797cc37ea9d92a1cae601f. 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/QZTAY2329804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9705cfd145ca31ccae7e466ab1be56578fb6ce3e8262692eaa234558626dd7b6. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZTAY2329805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ade4c6d33b60c3081d997dbc67e36e6a6c2651c1499227832182172bfe5edc. 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/QZNWV2317590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41935a754aedc3c3efb467a0a895d98094c17b57a3544ffb9461771bd2d97561. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TCAHQ2369016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acce86c7fb8adbb793ac02c3046e07fde601b20387d58eb901973ef06488e02. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAHQ2369020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8825dca2c619902c63f1f37235b7ab34889e4bc419616f532bd519aff2e4ef0. 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/TCAHQ2369026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8550db4cf4a9300e080f42dd2e920f3dd710837fee33813db2f3a3635b7b5e13. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/TCAHQ2369040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23580be3e7ec63917e050e20de510bc1dc700a61e399bedb1bdabe50f8aa11e7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCAHQ2369046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4bea5797df94fc7c5ef669eb8d58d31cde2e78d9823f9935e1a6c11bb63752. 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/TCAHQ2369049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c992670d8b51d69b5b5f50851b5131900735fa1588cf0c056fc23fedbaf1cbb. 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/QZZ792475385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923cfc1d12ce1f0155c8b9a58b837463bdfd557e707807192ca15ff53c8ea625. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZMEN2258726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f791d949b244d07aa95f4835c9c73856d19cea64a1b774dd7631d55ed77186b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZRP52132954.