Dux (; : duces) is Latin for "leader" (from the noun dux, ducis, "leader, general") and later for duke and its variant forms (doge, duce, etc.). During the Roman Republic and for the first centuries o
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 0x6a1c32fcbb076f505298d5f87127fb3f1dfa907d721d68e8169401b42e2f7a7f. 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/2c661f46-3e66-4827-8b37-b888acc23a67.json and https://artists.proofprofile.net/proofs/artist/2c661f46-3e66-4827-8b37-b888acc23a67.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 0x3491223a86f273774a5b47932ef5257647699166626f1dd8e109ef75b34cb7c5. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QM2PV1662863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ae753f34f0b9de54026161395f4ba92e5dac07966859476cc38224b9191ec7. 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/QZB4J1800327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb62bae26f9bd06688ecc1974da951b57fb35952fd820f5b2b7f61e7eca1cf5a. 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/QZFZ61944475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1039cc41d41f871b68b9fb5268ea8186b64663537918a5d5b81a3f95b359fd0. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZHN41980242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9351b7af2da6800c849d8db9ba6c9fac3421233d7c750cce3ab9009cc9c9d12. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA82121015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04254774566f5ae5231967e38fdf3414f60a923ddf63de36d51677d7af7e51c2. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZHN52313446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6f4a1a9c79885aece961516bdfd4d11b9bee414721f5e74c3dc65ace231703. 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/QZHN72321662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3308b612a6759b458bb5261c90f47ee643090967cf7694fb575abd89d85e37. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/AUMGB2400978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6f4a1a9c79885aece961516bdfd4d11b9bee414721f5e74c3dc65ace231703. 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/QZHN72321662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6de9f998e1c3269ca355d775bc812085dc3c1cb3cb884dbb513a35599f12e5. 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/AUMGB2400605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81089fb51706f46f37a28daf10992bcf6f84b9e3491db8668cae3472d1763529. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZES52302549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b350dcf9056cef969636091410cc1d52b6af2dadf9a7c31d830eb31f10fd46a. 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/AUMGB2400979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a458ff1ceb401dad06f55806d426d2e09901da83e9aca19f8380a608565fc69. 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/AUMGB2400980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e340f717c6dd58ac65a757fe659be63db37777624f631ee256eed10dff10c3. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZTB22339610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b375df2b65c94a6109d69bcbc78e5e7205a4d1759bc7a8b095447c54176708. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZK6M2135039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9f3d40791e3bd65dc284820ed2f31367b858cbb6404321c947ad32aaf03629. 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/QZNWT2384810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c136ff19026673bb01e906e56bd8a5fbf7cb7897ed2484ae1ac10e19e0c363d. 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/QZFYZ2189644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2a2e262568f50a0741d4f9a6bb8dbb5eb76e916412be12e93a273ac579852e. 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/QZHN91905803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2a2e262568f50a0741d4f9a6bb8dbb5eb76e916412be12e93a273ac579852e. 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/QZHN91905803.