Renata Tarragó Fábregas (23 October 1927 – 2 August 2005), a Catalan guitarist and vihuelist, was a teacher and performer, both as a solo artist and an accompanist. She was the first female guitarist
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 0x1bf013324df8ab19b50516dea79554c603b4027dbd6434622fefb2635d214a96. 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/98e982ad-6a3a-4384-82eb-3fc76cec0164.json and https://artists.proofprofile.net/proofs/artist/98e982ad-6a3a-4384-82eb-3fc76cec0164.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Chants folkloriques espagnols (Mono Version)
Vintage Classical: Guitar Nº1 - EPs Collectors "Música Española Para Guitarra"
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 0x5959861347210a4a80bbb664c9e28534eb284ea8a441c545565d679417200abd. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5271102901 — a six-check JSON result.
Siete Diferencias Sobre "Guárdame las Vacas" - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bab17e755cc87b716b6360cdfed01e7d7d8734c43c8dd2824394cd9587dd24c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ES5271102902 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca3f436259a9fbd03ec7d8d31f5235c48b09a3f85b37f30d2d2d471f9f2c0d2. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES5271102903 — a six-check JSON result.
Fantasía, Que Remeda el Arpa de Ludovico - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fb9f58840f8ee414d68116ea804a86f0c057f178d0cbbf0163ebaa9e150d83. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES5271102904 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92cafbf6af0ecd81275a4d31f2cd65f725be57122e83a24f072c4c958427296. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ES5271102905 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb1cacc576967d21250a73ffac4edb7f705281af59590826744b395d15ee072. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES5271102906 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190d863a97e0b9fbad62675bb3a38dbd3614c1a58a5ac8329846fd3c9ea29e3d. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ES5271102907 — a six-check JSON result.
Minueto y Contradanza de Los Currutacos - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339d7a601199aed65e8bf49d69f5be9de974b5e6cbae1c988d2adeaf7ede6a5e. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ES5271102908 — a six-check JSON result.
Minuetto en Do Mayor, Op. 22 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab0673480448825c847dc38e1b7ebf7661c72ee8d4e9ae32140c758d8f17780. 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/ES5271102909 — a six-check JSON result.
Minuetto en Do Mayor, Op. 25 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f583cb7824300fc787541eef812e6915801d29ead0a0d8c40adbe95dfc1002. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5271102910 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4544abb4990e19aa849a6f0aa69eeeb608939c15207449a3bfc79b4677f0911e. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5271102911 — a six-check JSON result.
Estudio en Si Bemol Mayor, No. 23 - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f64e7178f7a067aaedb0366fb162fab36fc294be21e46b1e2ac73ceaa3835cd. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5271102912 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41b3c7a82ba206f9438d2a6d5e2abcab34b5adc71949bb56a6d793a44377644. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5271102913 — a six-check JSON result.
Variaciones Sobre un Tema de "La Flauta Mágica", de Mozart - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7e34647d8365cf731b597b96adcdbdbca441dd76e89dcdbad35d4beb76b57b. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ES5271102914 — a six-check JSON result.
Les grands compositeurs espagnols : Musique espagnole pour guitare (Mono Version)
Guitar Music and Songs of the Spanish Renaissance
Concierto de Castilla (para guitarra y orquesta) / Recital de Guitarra
Concierto de Aranjuez Para Guitarra y Orquesta / Suite Guitarra Española
Moreno Torroba & Rodrigo: Guitar Concertos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf85ab5acb80b2b74f3278e7adef8e64b793b2435bd4be3b5a6f48740ae4d78b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CA5KR0000424 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3f0210e6c5d996dd89ded67e374f2b034544261e03ceab0d2789e2970a728e. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/CA5KR0000428 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb8f2ecf1d09a3ff3275372dc3b18fbfa9012093129c4e7348d2b5ce79fc79d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR0000429 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645fdfd70426a922124752e679c4f7032f644e2cb40cd7adc026de88c99b0631. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR0000430 — a six-check JSON result.
Fernándo Ferrandiere : Minueto y contradanza de los currutacos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb303fe54d78469ed6e9b34f611fd3389a533f1b182a622f53ad754eee53d9c5b. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/CA5KR0000431 — a six-check JSON result.
Fernando Sor : Minuetto en do mayor, op. 22
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aba40fc37ad9a9d589d378e3248fed689520f947262cc89da2d3068b0371b3a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR0000432 — a six-check JSON result.
Fernando Sor : Estudio en si menor, no. 9
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5a05dc1c00a8bc62522d5731d7f9bda5f80f481a622964fab948d8ae6530b6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR0000434 — a six-check JSON result.
Fernando Sor : Estudio en si bemol mayor, no. 23
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e190d4f3ffad037c19c03c38b369e5f1b17bf33afea27ebba0c32fd6e50bd0b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR0000435 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5607f6d00b842f81e9f050dea9e84b32f6615d29cc8254bb21b4dd328f81cbc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CA5KR0000436 — a six-check JSON result.
Concierto de Castilla - A Guitar Recital