thumb|Famous in the Balcony of Music. Juan Antonio Ipiña (Tontxu) (Bilbao (Spain), August 17, 1973) is a Spanish singer-songwriter. He worked in the radio station "40 Principales" in Bilbao. Later,
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 0x58831889b90e5a9af633fe3d4593393e6f6f4cc04804f47df776921e8946375e. 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/7f015c83-fb26-4867-a8e1-193e461350bd.json and https://artists.proofprofile.net/proofs/artist/7f015c83-fb26-4867-a8e1-193e461350bd.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 0xc5b7b0b4f0efed9b3168e811d3e28d249a7be96ae1fd23d128c95824b5b1b8f6. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5089804336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d9d009bbf1917c0bb8700606c3bdd2cae4231bf4a3e56357b7b238d96c4061. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1765027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ba9cfe251200d7ecd92530911380f7f4e62529af37f0efa25ac633d4b6c44c. 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/USCGH1765028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f0ccb185b5315060e1c40d9a26ac9d04656625b243d1f626aff0ab097f4d35. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/USCGH1765032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d9214cd554096e6f11c9738bed3b165801d5a600d6d7420d891f8ca023bfa3. 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/ES5080107851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51af20990ad68ebf128c25294e7905a0a52c3854f741bf7699f4bf4e54d7581a. 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/ES5080107846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18813c42ccb5e2e4a98aa37b73cb189ff03893a7ba067558c65e52da05b705c7. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/ES5080107841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b76fe092f69d8248c1b90b7988cd0efcd19eb1d76a5361d86db72643fc3f325. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5080107850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85f6030ab7cbb8505479bc9150b2b5fb053eafb67424a111d17fd04d8df038a. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/ES5080107847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87145d80966a90ce89f3050ebbde1fbfb10ebd6acbd8924beb5e32276d350644. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/ES5080107855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74754894f33590481d464b186732417045c7fe851b0c0d174d58d292e928e672. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USCGH1922269.
Corazón De Mudanza (versión invental 2021)
Somos De Colores Popurrí (versión Invental 2021)
Somos de colores popurrí (versión Invental 2021)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0c32cd92603c673a7b7b1c1e7f0ae12350d40bd2878ffcf08c6700428c5c90. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5089804333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ef5b22f5e88d100a76e8ad4ac9887a8603a5a92fec7e670af0f7e614550f9c. 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/ES5089800240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e4a639bed17c258e2bbe14d460903323f2a80507b44820600df25e8cb43a6e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5089804338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab218261bf6f043443a7866f2ea51e557fa3df1692d9fa73e5af60626c0abf1e. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ES31E2400001.