Marta Almajano (Zaragoza) is a Spanish soprano.Biography in Spanish The gramophone: Volume 81, Issues 967-970 2003 "Much of the appeal lies in Zaragoza-born Marta Almajano's attractively dark, richly
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 0x092063ac590e36dc47128b023ab1e2c7babe580c0f4bf9c8d43085c6d633a49f. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff85cd13-9f0a-4451-acf9-e006c82e6345.json and https://artists.proofprofile.net/proofs/artist/ff85cd13-9f0a-4451-acf9-e006c82e6345.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Orquestra Simfònica de Barcelona i Nacional de Catalunya
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 0x79df71f6eea109a8fb48d4720d1416d588c88dd44612de0b8f41eeec391782eb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1270901 — a six-check JSON result.
Jeanne d'Arc au bûcher, Scène I: Les voix du ciel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca47bdc15a4987d89781ba2815fbfdad6d2735286db8b8f1061f826886c67210. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1270902 — a six-check JSON result.
Jeanne d'Arc au bûcher, Scène VII: Catherine et Marguerite
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf704c80023791ae93faa9c3c44357b9169cac8af106e35084ff56b46a30d8a87. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1270908 — a six-check JSON result.
Viento Es la Dicha de Amor, Act I: No, Que Quiere Mi Pena (Seguidillas) (Liriope, Amor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2e2967a057c99de8776b2faecc7ad3d299df414eb155bf5e2da85c4f855496. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1735694 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4381d1e1379430abd83cea84c001d7d93892556434710dc07e84ff5b14b8d1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7891902001 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92d3f569756566f9414e51b6f42e379959971d4eb4c5e8c63ba7bdf887e93d0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899800101 — a six-check JSON result.
Albinoni's Adagio (And Other Great Italian Works)
Adagio pour cordes et orgue in G Minor - Attributed to Tomaso Albinoni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6fe15f98e9bebb5652d17635e37fa8166774da115cedb23ed99e6644641bccd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1702005 — a six-check JSON result.
Selección Clásicos - Gluck, Verdi, Wagner
2 Coplas castizas: No. 2, El dulce de América
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38aa0b75f4ce0a2358531c674354d8c094bb6b7c7b5780053f0d55387458a6c2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899901002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00964583f934d4a169acd4a46d7b3774803dfb50fe12508bdf7e1d72bade7c52. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899901004 — a six-check JSON result.
Music in the Time of Velázquez: Songs & Instrumental Pieces from 17th-Century Spain
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12418fa7dd0cbbb7aba5e5f913451ed06dca171126a5248be8f4131170accd1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899300101 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd01c2a8cf044b905f3336631ab5cf8b2f82259044c47682a6e6bf781852a2f. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899300102 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea46148929ad5460390a6659b61f97e45aa3e5b2523c9d42f6b35b2482b85d06. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899300106 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070e908e4f9e57693ca9b0a2e87837ba064c81a31ee6ee82508f627b5e165d59. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899300108 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b41316babec6f5725f09523e66efdaf4eab04544c15de3a98bb08f03986b3c1. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899300109 — a six-check JSON result.
Leçon, Op. 31: Study No. 23 in E Major "Mouvement de prière religieuse"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d1f8403c62d419b0a1b8871ac4b88fcc9a74a247423dd7aa768d233d0ff7c5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899500113 — a six-check JSON result.
Al alva venid: Secular Music from the Spanish Renaissance
Nebra: Para obsequio a la deidad nunca es culto la crueldad y Iphigenia en Tracia
Boccherini: Concertos pour violoncelle & Aria accademica
Concerto pour violoncelle No .7 in G Major, G. 480: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d1f68ac312dab32e8aa0df660370ee78324108ed2b2413e3fefd6656cc31ab. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X41714172 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1868fe3852a4222d83f235eb1cb58ab1b95577f166c47daf100bd66039a7bd. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA371635301 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52366b312044e3797eaf3ee061e6956f29587d5767b0fba05a8e368a9295a1a6. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA371635305 — a six-check JSON result.
Barroco Español Vol. IV / Los Elementos - Secular Cantatas