Juan Rafael Cortés Santiago, known as Duquende (born 1965 in Sabadell, Spain), is a Spanish Romani flamenco singer (cantaor). He is considered one of the successors to influential Flamenco singer Cama
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 0xd3c82e688a1d650d7cfc85eda070194eb839642edab6d34a9beec3a25c47c920. 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/9d3dce4c-3678-40ec-852e-1f2ac58e5f9b.json and https://artists.proofprofile.net/proofs/artist/9d3dce4c-3678-40ec-852e-1f2ac58e5f9b.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 0x6c2ab046717d2ffd6af8c1f0812777d99bbdd77200e75b7541f3ce1842ed4c73. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5120900450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efb7988ba66b79d4b4404c840be935e11a7c98ff57555cd5a89ffb2d20dceb8. 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/ES5120701033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877f6ecdeb1024b47f2a049be28d6971f2334e2135999a992397709b94fc2cd0. 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/ES5120900451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15aea47a169ed8fac6e3b4de9119de79fae2451ab84ffd968e3092de138f085c. 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/ES5120200570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd857d13890ddd8925ee2b035dcbf5a8851cc1c7133af1f439de127b449a57f. 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/ES5120500872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b57fe20a7cfc310df8609890f01269955587c03db456cb3e464c45515e895d3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5120900452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9d320448c3680d1d8c5eb4a67ab69ff1bea575e2cce0a797a792e019bfba29. 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/ES5120900453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae72d0e134a2b4c34d09db3888d8f9f5b840533cb27a481722edd849a313fa5c. 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/ES5120600981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866e7f0831cc7f13f8b7ac84e3065247c1b2e5e88d3f99994d55c11089861edc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ES5120900454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5739408c3bf90c1eff47c830cd1614d50f258117680f44430197b3544658ccac. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ES7580501731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab70cd3faf33032ef0239888a14e00c16efb6edab008c8cbc8a3d44dbe4d223. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/ES7580501732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab70cd3faf33032ef0239888a14e00c16efb6edab008c8cbc8a3d44dbe4d223. 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/ES7580501732.
Grandes Figuras del Cante Flamenco : Duquende
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d8630c42f47c15257dc85a1149634a101148933d8e68f0c697ad85b4bd94f2. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ES7580502036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8251b9e9b07a236ad2c280892ba38dac09515fa943f71e6b8e64a063f87c06af. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:09:44Z), 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/ES7580502040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e865b0e789f7ce5f606447a4d9c52fcd50e5908cca7fb0e4f5bc6f257deb9d0. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T03:24:06Z), 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/ES7580502038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3538293a280fe7e120a0b1b31fb9515d1a3a6d9c7c277764292b10fceace9e8a. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:30:37Z), 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/ES7580502042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d5c72412622ee71a5a2a652bfbc568b99579de5610ccaef06682195fe23115. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ES6100615905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8158dcd400e784580f3ff0cc559d60dc6c03f0276b035af427895b27e9c980. 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/ES6100615907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634a3f089f7f56bb8bca1a35a3393c90ac3d5da8d93e0d601637624f2f4fa596. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:36:52Z), 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/ES6100615910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2133b9723e40cf852cf026a63797708d6f6f677414780f9e69a23732fbda5b98. 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/ES5701201272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5ee27e6ed649cb1640f9cec0e63542e2fd99f00f65eab3ee776493b2a0b740. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/ES7580502041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce15f4acec32b086b02e5fec3f2022370ccccb923d45447fd6b1c2aae510545. 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/ES64E2203538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9895f45c72da19d01e642f1de42697e911f27c9052871b08bba93ba53e42d33. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USSD12201187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe7dcef299a6f09f79fc7c0b089bd57e4103c0b132ff9296c5699913068c801. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PTJT11300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a3b05ed154eee21bc744db3072c54fa144493453128f97ddfa4aac07f61c61. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FR0P12100250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89f6f2eb69e4ad014683fc046c882e3c6dfc64e12f6be92cf5a46d37f1eebae. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES5701800137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e5146154142b3eaa7f529ad6119ae78cfebd03699f5851b5288e7ca7300ab9. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FR0P12100240.
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