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 0xf1c8e957b698e0d06727468ccd63e4fdabea880f74b267643a2a9d4fbcaba12f. 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/b7a90c0e-3ab4-457f-aac0-bef6f19272b0.json and https://artists.proofprofile.net/proofs/artist/b7a90c0e-3ab4-457f-aac0-bef6f19272b0.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 0xbc43abd222960a38e22e78af63aac369277710a4433b1393e81aaf4b606a63fb. 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/USANG2254593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cda3bf96acbdf6aaba637f19fe5c96ca9c5d9dbcd65394e263593d73225b56a. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USANG2463375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9f72d9c95d1e6f79565382784ed2c8809f21e42dbf99fef8e7b3075ab7cdcc. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USANG2471550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089bc0a8e0d13d15d931ccb6a76d73295b7dcd618e285fd026afc375efa6ef4a. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/USANG2459957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d85e4e0fd9b61597fe4de92898bab531fe54ece05e043b59df7c90c8245b2b. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/UKZGC2410159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10bd58b921da2c0feb3f281bb0afb0ccb26dc406701a005ea391f7427798a37f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/UKZGC2410501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8abd6f97105478b8e7eec0af1dad6e12444eb792c8b8f85169271f341a875fc. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/UKZGC2500669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb41ddf0b7695f9d8271824af331b1c7a424b09448df581bcac91dff03e8aab2c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US3DF2514259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9ac62d30f1f618a58bbf84d7e797e6534d17d17091926be8d9121b37bbd97b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US3DF2556841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bbadf91c770467de11041dc7f93788f54be06b6ed7c175f0c1a668e2efa69a. 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/US3DF2214321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09942322b6e3486a8ba55218f799f300a7c5a20e80d2663a81d3461dc358865d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USANG2099611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81035eb5149b7f5992daf0fb75400fd8209cb89be0e67e6e0cc9e90677f29235. 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/US3DF2076713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac3bf6b4dc02f216469c4e379dee62710f9be4d4ae7a0e9cd30ec13f327bf78. 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/USANG2103157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e14afa9399fbabebd09d627f94a5d9475512028b4701f6071a9f1698809972. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QM3DF2175161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ea0f64369dac4d70cd4be467d149899bbde606e761c2f28559a30a207a70dc. 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/QMANG2233800.