Xabier Lete Bergaretxe (April 5, 1944 – December 4, 2010) was a Basque writer, poet, singer and politician. He started to write from an early age, and he often published articles in the magazine "Zeru
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 0xa89a6b766698e64ac3cd404d516427ad518902f2965f01742b1c8135fadc8e65. 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/c4d643e4-a92b-423e-8aa8-66f1febae1cd.json and https://artists.proofprofile.net/proofs/artist/c4d643e4-a92b-423e-8aa8-66f1febae1cd.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 0x227f488ff36249413f5139f40917c9426989c203e97390bcfad003797def6c27. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590603545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf74421e39191c54aa7a966e1aa31fbaba8a3299a6239f00bf91bb5c09435ada. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ES5590603553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9a31fe53ddaf3b876474b365f98ac777fa7a97dcb886070d48de8e3c5df6ad. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ES5590603536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866cf0959fb5832302ca02adf95536f9b03f96947ceedacbfc3ed3a1908b5abe. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ES5590603537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f19d1a25f2713df3f2132c5746e5c35ced1d1a11eaded834bba7e6a9e202a81. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/ES5590603539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748fa86873b91c601404fa6f2ef24100a8f2afde7c3937614efbedf9081b063a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ES5590603541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb58253203eefc79daefd64f979556c97aa8c2ae04d3d698b997621cac88ffcb. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/ES5590901268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0938363116b5c616894e166b616143ee7f22a19b493761fc2d2e57390c246b61. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES5590601126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597791672b060b0a33164ccf5d2042679f78b7fc1b5f22dbd7766e12e3e2b31c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590601129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5183a23d2e285856064089ef7c38807e3b21192820183607f2f782f2a3e687. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/ES5590601132.
"Otaño - Elizanburu - Etxahun" Berrehun Urtez Bertsotan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775b328cc12b67afd323aac8245fdc8c873a9a257cfd5aa6584ad027c8471f98. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/ES5590900676.
"Xenpelar - Bilintx" Berrehun Urtez Bertsotan
"Basarri - Uztapide" Berrehun Urtez Bertsotan
Xabier Lete zuzenean: Errenteria 1999.IX.25 - Azken kontzertua
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748fa86873b91c601404fa6f2ef24100a8f2afde7c3937614efbedf9081b063a. 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/ES5590603541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597791672b060b0a33164ccf5d2042679f78b7fc1b5f22dbd7766e12e3e2b31c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES5590601129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2014f801a59fc704001a98b458897ea0725deea32ee4be30ca730cc3b41039f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES5590601124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf74421e39191c54aa7a966e1aa31fbaba8a3299a6239f00bf91bb5c09435ada. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES5590603553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fe63ed2966ca2c75a1480b14770917e7fdc9f3a2f125b5fcee75b6befd448a. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES5592000050.