Fernando José Mendes Rosas (born 18 April 1946) is a Portuguese historian, professor and politician, being one of the founders of the Left Bloc. Biography Early life and education Rosas was bor
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 0xfe6dae5e2b8954c3b0e6d63ff65e14f8d54b101235c24c9889606822f2230f58. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c74e095-12e0-404c-ad32-a64cd182a09a.json and https://artists.proofprofile.net/proofs/artist/5c74e095-12e0-404c-ad32-a64cd182a09a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Nochecita y Otros Éxitos (Remaster from the Original Azteca Tapes)
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 0x5e3a23dbd598e0ca8747504542dc0820a4e4dcb1d6b8aeafb33b304aa2f633dc. 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/MXF010101010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548892d278b75abf35a8d193dd5d5af100a57f03c5443f6e9300c19c917bbd14. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/MXF010100011.
Fernando Rosas Canta a José Agustín Ramírez y al Estado de Guerrero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc345f0d20c9b2f7791dc918e5cd59b2426d2a12b7891b52715c8dfca2a4daaed. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/MXF019800201.
El Buen Humor de Chava Flores en la Voz de Fernando Rosas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae6dbe5b6183c64768421fa6d851c6697e5fe6327e03864d997de1440d8116c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/MXF019100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239bda294cc22cbfe6b60fa62b7a06936a777771f731132ae380bc317a635b91. 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/MXF019100013.
Tesoros de Colección - Las Estrellas de la Hora Azul
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064e3674af00d3b288e0298f600dbe1417029da49a87851dcd7c5be372ffb008. 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/MXF010101015.
RCA 100 Anos De Musica - Segunda Parte (Lo Mejor Del Folklore Mexicano Vol. 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ae21d23540fae708395c344c7be8e2ea694e56243c9cae66db4d44c1d01581. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/MXF010100991.