Montserrat Cortés Fernández (Barcelona, 1972) is a Spanish Roma flamenco singer, artistically known as Montse Cortés. Her discography includes, Alabanza (Sony, 2000), La rosa blanca (Sony BMG, 2004) a
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 0x044b43ad4ebe87329e3131ba6340d2717e3ca915e2076cba220a4c0faba85fa3. 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/cb9ff39d-cfc1-49ae-a1d0-5b568e44c8bf.json and https://artists.proofprofile.net/proofs/artist/cb9ff39d-cfc1-49ae-a1d0-5b568e44c8bf.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 0x8efcd12ad8a2ce9ec8b21a6d810d42e5679b7a7b3202acfb24c3662d1f461e15. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES5119902486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e338cbb1c6ef28bbb5bb7ffb654a72744cd780804b982ad2f765be7c4bc2c7. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ES5119902490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b832809e1b753f8cc7f238cd00d0de547f98cea396791260904cfd25c71ca5. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/ES5119902485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab325b261ba0aa073a0da00f2a69a6481d2e15fe3738da64b6c32afd5732ada7. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES5119902484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06713d5308e84f3a7cc2beaa4f5a11353e95270e2570e159747c5fd5a62af25a. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/ES5020400267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1d7d3f076b675bf9fec727d3248b75cfcfa023afe60da7c6a08206f8689062. 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/ES5020400269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e330334badfaadef76e7f22261a1b628cd47addbf87252753e2f6814ae7d9b3. 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/ES5701300704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c015e507fb360e1957593ed0cac5fec2a25e8a757729eeef01753cf19c22a9c. 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/QMDA62402444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a125eb54835207c929d559394e067d9ec823ba6dd85c29ff693888c2e06c46. 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/QMDA62402445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69dd53ac0be80ea50af78dace4a551728854a4ac99df130e74fef17340a37bf6. 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/QMDA62402447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01835b8491a933e8ff7b4c67f2e5983870d731fe682ff13c64da92ccddc899f2. 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/QMDA62402449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4439d271282bcfc1b74bf770b8cb81dc320f62e56044a0bd54acfc1be9ca095. 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/QMDA62402451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe801e29070dee2e9e3a8706c274b8e542967a0249fd124c482114a35e43e1564. 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/ES5700300651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe801e29070dee2e9e3a8706c274b8e542967a0249fd124c482114a35e43e1564. 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/ES5700300651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82751d4f78d9a06fb728d91a430d979f3569919acd5e7497b9338a0143ba057c. 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/ES6101199102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854dc9787d4dcc3181aeaf75912e217605433eead3068d4fdacec1fc6976a3c4. 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/ES6101199113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba7bbf459535e279da582fa37472bc44ee71b317a7cdc3938fdbbc044c32e97. 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/ES6100721408.
Cantares. Los Artistas Flamencos Cantan A Serrat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e67635fbe5f162d4301a706f245c6506f27ed7759edb36d4d919510611bff0. 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/ES5701100863.
El Beso Libanés (Canción Libanesa-Iraquí)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ada57dd880579e023a7ab61dec6a67967f0bf9caed5d7017110fdf1a7b5ab02. 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/ES5701000656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a215892774c0cf6077700bef7fbf7b768cf52a0701cdd5ded2ada1d67f9325. 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/ES6102422606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af037e1a09a2fc6aa58a2fd77c40337ed0c6c66e63fa8c0e174f12fa1d36ebb. 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/ES64E2342143.