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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78fe00b310647be54cdeebf7433ab864d058b79c2e8665dfbe7f1af2de71b5e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c91182fc-c489-47a5-8c04-03d62c7bd19b.json and https://artists.proofprofile.net/proofs/artist/c91182fc-c489-47a5-8c04-03d62c7bd19b.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5ede1ea963d0ab413959c5a3e8c16dc75f8a70cf7cb09605c01b2eac7d572a. Chain 2 (Bitcoin): anchored in block 957852 (2026-07-13T11:25:45Z), 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/CH3131600148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609b4d2ba4cdc1749900e8208e4003d9f2dc9f1ff09b45b3c791b3082677a4e7. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/BXBB91500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e68d658f9e2763d1dd2ca06975e10ce1ba178745b493aa88183653c31610ff3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BXBB91500026.
Com Você é Melhor (Remixes) (feat. Di Ferrero)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37257ddfe7592d55b2e83ce47fc56813796eae2da31e3671da1e369f30c707ae. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T09:43:45Z), 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/BXBB91700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a330f7f559c545e67c4b07001ce5c658b88754cc724acbb47fbddab7357edf. 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/BXBB91700018.
Malandragem (feat. Clara x Sofia & Raphael Capelão)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b46896d069e54306a72e4e6ed87fded93c408e25373d5fc0f78037a267bf11e. 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/BXBB91800005.
Hold On (feat. Giulia Be) [Extended Mix]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee8bdc022f20ef85ae137094ab3748af13945ce594c90992aaadf6775b929df. 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/BXBB91900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e845c6840c588c083784a7557ba6887dacb4750c4d2ba1ac723a657dc5655f4. 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/BXBB92000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9205d6de63c6db92e91d64b0296715b4da81d1c550be8040d06a5a56d982e38f. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/BXBB92000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a80d35edc979576749c2de2e0e3faf7f10dab69d7e85f464de6a38534766993. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:09:53Z), 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/BXBB92100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429c9cc956f58b400f31e2880f21c4c1489333ddc95f6822d63c048ce130ff04. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/BXBB92100004.
Nunca Fui Desse Lugar (DUX Remix) [Daparte feat. Lagum]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eae5f5f04b7e060bbbfea1e0bf99633d4ca33007b3875c4e45f712b3d47308b. 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/BXBB92100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0dc0ef3c0abbab7d44fb9afb10f0090f0c20772160a697c7b0af73e10a21ce. Chain 2 (Bitcoin): anchored in block 958691 (2026-07-19T07:19:31Z), 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/BXBB92200004.
Porta de Entrada (feat. Igor Trezelê & Paula Marques)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0d4d0c1b7fa6236a4ba346b4cc34e2428c642b839a92f132b16e9059439271. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/QZGLS2396290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b2c686fa5dfa6fe669cbbc489ede835c14c8fd515a8bcfbf1cc42b9a22086f. 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/BCQAB2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1a4bc9b35ea386e742895565f4220bfe90c2a48946ac5ad8d1f133716ddf66. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T16:31:39Z), 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/BRM4J2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5287f3d65983653a286c851238a11ac83135d306bfaeeb3c57a7cb1ebd9ed31f. 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/QZTAX2548647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e845c6840c588c083784a7557ba6887dacb4750c4d2ba1ac723a657dc5655f4. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/BXBB92000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429c9cc956f58b400f31e2880f21c4c1489333ddc95f6822d63c048ce130ff04. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BXBB92100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322f6d6dd2136884115d2f4b88fc17fe3da6fa4174baf46ce50f8c20ddc41401. 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/BXBB91900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed85294a33da28c4105c0a132069164fbcbc9ab86b393690a1366f92d5f1349. 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/BXBB91800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322f6d6dd2136884115d2f4b88fc17fe3da6fa4174baf46ce50f8c20ddc41401. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BXBB91900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed85294a33da28c4105c0a132069164fbcbc9ab86b393690a1366f92d5f1349. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/BXBB91800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322f6d6dd2136884115d2f4b88fc17fe3da6fa4174baf46ce50f8c20ddc41401. 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/BXBB91900011.