José Larralde (born 22 October 1937) is an Argentine singer-songwriter of folk music. At the early age of 7 years Larralde had already written songs with social content. Throughout the years he would
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 0xbc562904b660d5cfe417a583e48694c418ecbf275ff3b27b8b702e62d5dd1702. 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/5a5ba900-c9dc-41ff-989c-80de3468cc49.json and https://artists.proofprofile.net/proofs/artist/5a5ba900-c9dc-41ff-989c-80de3468cc49.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 0x4c4d76198e4ef33021f4dc5e1406660b95b9fc3c19952bc3b28f8941fe49a5fd. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/ARG601400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cfb0984478c9caf96484c370ca843b7c31c09703baeb3e45b6df53f6e5dcfc. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/ARG601400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf930083faf04498823dc91e52b23a4b324ee87cb7e3ee4826ab118158a2ce93. 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/ARG601400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82181f63a5aad9e5abe1615001a7ea3cc51fcd1c39db836225368f47869886a6. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ARG601400046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9eac25d2522f55ed800e94efaf6858ebe487f9e22bb3d9d6cc9df307279d7c. 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/ARG601400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b12417e504d8f2841389e5c99fea6ec0091e356f629f5591cc3cabbdfaefd5. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T22:38:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARG601400052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5d3562bb88cc3476e42c2bc118693d0a3973841bf0432fcaa52e93d68624e5. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/ARG601400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1142f3c0210fb9ce0ed22917ca0f30078e1cf1de05a98903748dd878865250. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ARG601400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e448e80b01e31e303c4cee928a6a030b63b3401bc79f791f22ac9baf6dbe76a. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/ARG601400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f97919d719e2694b869c85a6f300a966490a4cf0421102a1b73e8b7c968ce1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ARG601400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52efdae68826e706ced99bc802dbb2d7280207e6684ef0bd58099fe28b93aec6. Chain 2 (Bitcoin): anchored in block 957745 (2026-07-12T19:20:20Z), 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/ARG601400056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4d652fce1205e917a60aed5d7a3e214bfd5c41fa8a31fcacc0fbd149ab1946. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:44:58Z), 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/ARG601400059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa889b6e09ceecdbe973d059c7e77ccd6d02ee9e2561754542e80874b2d38c63c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T23:06:52Z), 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/ARG601400060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e57b56c0f27f4508fe0fd0c7858105e296f827255a699ea716e10a5da0163c9. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/ARG601400061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183f8ce7186b85493440d0a58accbfadb228b174a99c0ada290fed6f3c1f25ad. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/ARG601400062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbe0f32de9a168347fe6cc3abddab2661ab56751443c95859065fdcd241692a. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARG601400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56366e1e96b9921a762204bec9af967e9530561b4ec3e5e92daa06de907de73a. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:42:06Z), 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/ARG601400075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce28b330f4501ab0f31982c03aeee83a956feba5edb3beedaa7bfad2225b9950. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ARG601400077.