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 0x4b22d11703037de5a0d08388d956fe0592d9972275e1b2f1b03291b059cfbbff. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/74b18fc8-5ae3-4b5a-ac8e-99e6ad7c65e7.json and https://artists.proofprofile.net/proofs/artist/74b18fc8-5ae3-4b5a-ac8e-99e6ad7c65e7.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 0xea1ecc25a32e6031357352df734ec67700f9a37e9c2dd16283a5e4cd23477dc1. 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/QZTV32444242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d2a977449fd8e7dbdddf74164460d6a38a2ace6de4cbba02438baf73bf7384. 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/QZTV32444243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992dcf6ea286f947a7959ea8d0bfe7ee7e61703a30dad4c23b8033aada318b30. 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/QZTV32444244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547b15db3baec4896c9e6cf4f3a0730d7824d9b62fe6bc414a6f99e945a952a1. 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/QZTV32444245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacee1b48b0a2112c43a42958d06c410d73607e9e7349e67cee352e510add097c. 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/GBRKQ2355669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb474a56b1436861af665d8084860c8deb0a43425fdfa73d9bd6bdf4eb9e69ff8. 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/USCGH2168496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25c04f58afc426c5e716bf3c8c0171f8ae5081b72629b67bab385a14fa4f18a. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USX9P2069333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2a2ea3ca21371da4d7819066bf55807709d1eb9c2c81bcb7c9d303e7bd820e. 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/QZWDE2388626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac573ba9618f9f4aa0006cb45db77e8347dc6a289cdd4e8f64ad7f6b0432e159. 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/QZWV32356161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a51392f4ffd7fc49974ba396d7f860b0b2dbddb66b673814e23112bc8b238c. 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/QZWV32356163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a219c1ccd7511aa2f2ed124c4b340b80c4d00623d1080553c1a5ac1fe6b3dbd. 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/QZWV32356166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1304b467e4e9c48c6fc4bd3b765381af92a7a89744cb69ded3125ea927f183. 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/QZWV32356168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cefe15f74eaae7d7e83928242e0020093999b404e3154edee5ce1459b81baf. 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/USLZJ2285097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff455c94d263359d468d3255fae7119836e42ebaeb46d3843b0bb93dfb6885f. 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/QZZEC2321013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ad3f339dc8f2f6f8b7e6417e18ef8d1ac3ef7d48b6f7f83fe00c7ccf3f3d95. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZHN32370342.