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 0x4a9cc53b9bda5020caf5622dee208787ba4fcf579474393dcbd67f9cff640987. 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/995f2eca-6ad3-4187-94c7-ba046498b76a.json and https://artists.proofprofile.net/proofs/artist/995f2eca-6ad3-4187-94c7-ba046498b76a.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 0x6a07f5fcb6403f1473dcafcd6145ceda87d58bb2f264c8fe63de17c082ed03aa. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZMEP2160699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb7ffe2e37c8c9ae63725da3eb5af114db9851458cdfa68c48291de30d54623. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/GBWUL2489431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1477f1aaac90c7be121a672d7c9dd82bdc7e24e11c89396d1dfb66d0b890bc. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USL4Q2420909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfe6e2341622a2a4eddf3e0b29b7f70c89720586f45ae8858e51e64c80f6fdd. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZTAU2279648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86c3a9314721fe5c816ba04461b25b08c92ffcb6205a28518876f0bd19b0c5f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZNWW2100647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238f2c48aa5e87485a4c44f346d8a271eacb41a541db3767da4b2c61b603a702. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZDA72591829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39d61dac03cadc997563448d26ccd2347fdc03b51c4b072cd65080ec7bba0f6. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZFYX2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e465a0b28c7559338bb446231bd644e0b913c878a1e1b22a1362b5718de03ae. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZZ8B2467120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa921a3196068677c34f50d2c800239ea6725f7e9f7b2f8384553feb19d5eaac8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDA72586839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e5132094a8ffd94ffe69deb8ca4aceb1ae5bf7d32e766dcfbed8f23ae328a1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDA72593675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641fc685dc9239046b5bf721277135fd21d1ca8971e5895da15e0a984c85ac05. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZEC2416018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b507495681b69fd31f400d3fc381c3793478ce199248c0f2783f262bf52823. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ8B2437712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b33920e69e421c766dc9e09853f2915d4482022035febd78b054881a4584cf. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZWDE2435603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0ecd6901c845589d8199ab117d1f2485aaa8ffd075f6f56b96bd74809cd65a. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZTV32419349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11ee317c769271aec583a9f7d1e554b0612aebb517a08001ad941685f1f05b3. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZK6P2009686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce477bb0827852dfde701668dbca06c6a0acc3a8356592a06232483d1a00089. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZTRX2473229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4982d5e763cddfc40b6d6e21f5f06762864612acc7da9700356717fab5c309. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZZ8A2464816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0cd99f3a2754bed193bf94d6edd472d7e0d1aab3ff2292bfa252e32f56cf18. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USL4Q2419600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72955c22eb5f61f0f91dd80c38136f9b7afd8d7ef5038d6929645f3843266de9. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USL4Q2419623.