thumb|right|200px|Carbonell performing in February 2020 Joaquín Carbonell Martí (12 August 1947 – 12 September 2020) was a Spanish singer-songwriter, journalist and poet. Biography Carbonell was born
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 0xe2660e1a6f6d27adba6c201c8dfe0bcbab51581d2ce0f0c063bd380e953581c6. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7f0dd07-7928-47ec-b92e-34eda2ad0259.json and https://artists.proofprofile.net/proofs/artist/a7f0dd07-7928-47ec-b92e-34eda2ad0259.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Con La Ayuda De Todos (Remasterizado 2023)
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 0xe1c772860dc16a2aff7d78713622f5591dd0d652830a1a8876ce28a8bce5874a. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/ESA011790231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a345594184ecdd860c52b3e595e7293e217059770634c7838b73d6c8be3e56. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA011790232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2c986074a2664a72dd5bca8c8d7f296c5826a8e2e52244b3292cf208332eef. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ESA011790237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf685f4ef6a9ade91b46e5e617822e0dc055a31d80f33681e36ad2915febfc22e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA011778426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473baad72c009c0dbf796f241945e3d97baf58f37e0cd1ec9e5519c4304245d8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ESA011778429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451d66bae752bc6cdd7a1bf7d4e27e60350925eb845df36d2541862ee9d0f4c9. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/ESA011778444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586299e1573b4165b767b35090eb476e9f3d018ca31494c1e02ce081271ef861. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ES7861000326.