Joaquín Ramón Martínez Sabina (born 12 February 1949) is a Spanish musician, singer, composer, and poet. His songs usually treat love, heartbreaks and society with significant use of literary figures
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69085d0dc1b8719ebe3439b386373cf2cdc862d451fdf9f6e7022dd08b7775a. 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/9c869695-964d-4659-a19c-1134d0f36f61.json and https://artists.proofprofile.net/proofs/artist/9c869695-964d-4659-a19c-1134d0f36f61.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd750e4673de73ea195fa44d96918610a664bc39cce663f64d068596cad120dc7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES5110103543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7798447bc533b2668445b6f13e4299bf86cdfa1d4678fd0433a1ca1de8b4fb2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES5110103544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c28c2ea4eeb6fb41b72f344d87628e7cac196e403384dc14cf51992b48a2be6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES5110103545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f55a2f4f85dc3a9031d85c46fe0faa935b25b96ddb22f8fe94eb38df4119f7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5110103546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd88321e11664397e8a7ea22db414434ca9cdba6dd329bc903b3652301ad79a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES5110103547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597bbc3acf39af196be604473e8698eb958ad3105a0eae68828105c74309887e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5110103548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d16ede4729338c5464264988f73c301cb898d7db2c289f4f8129a22aa1277d1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5110103549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda93d4d0196734dd3a97e295aa85212f601790594d14dd2863ff4870b563a90a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5110103550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d930a4a38ac3ba5572b0bbf5017af852047127dd72da081fbe56050ed337d26. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES5110103551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6ff88bdcb6f9307c2969cbdb756d117404578953e44c471acdb408e6b8a0e3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5110103552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7039c58eff61779b3ef3baa39227a45d82a044ba7908eaf6304bbc7cb0b6ea97. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5110103553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93aa8e9cf334ba67eef946d09ea745b7404f4e1a0def8d1689b2c1a8374fc5fd. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5110103554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6e715a2e89818577d07f30925fbd7be3aa8089e16e0fe7e97374ff66ac2994. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5110103555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd065eddd281fa91227dbea34ec49e578e883e3526dd8e11a172feb3f897aae1a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES5028800110.
Violetas para Violeta (with Joaquín Sabina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ef2c13373a8009c913e50f1953dd4fa402563574fb57e0a6852feafa828116. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ARF100900187.
Me Gusta Todo de Ti (with Joaquín Sabina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8eacf90b2c3a9fdc446f5f49b1a8e656f235fb120d5fdccc474dafe838823d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES5021400610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fc14d705971d2891e592d91d7537f76618502a84738338aab476652b445fb9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCACU1659489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ef2c13373a8009c913e50f1953dd4fa402563574fb57e0a6852feafa828116. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ARF100900187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5134c1e97091c14eaaf33f755a908240ad02c23f03ff5ada840a811af41ea86. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/ES5029900169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95992eb672c5c147dd58a7e8ecd53580b1b2644b8333dfb2ad9c5a957456fd8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5029200072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad3f33a025c62e23c00de376cc4993d5a7fa8b0a1fc5e84de024359854f074e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUM71202450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666cbc5b043785f6aec1861f7aa670f70d9e1f178e0b3592da793f77d68cb863. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES5022000667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e6815a2d66405e30064596eb3d0edeea14ee30afef2939f988aa9cb39c66a2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEUD91767341.
La Flor de la Canela (with Joaquín Sabina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec83aee1e3590e2bc63e4d12e56cd129b1912d265ae1ee6fc88de165a583ce8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES5021200959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14824fa74e5f8138e1d71dcb2c9fb68787f36d9e07a3233806f69ce0c48f3ee. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5701500023.
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