Calixto Antonio Ochoa Campo (1934–2015) was a Colombian accordionist and songwriter. He won the accordionist competition of the Festival de la Leyenda Vallenata in 1970, was a member of Los Corraleros
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 0xd05401dc45d0a2324019b7720e1b1f2e213a2e8622a9a4708b2c352534a89b1b. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ee6290f2-2496-4d7d-b183-c9c3161bd4a4.json and https://artists.proofprofile.net/proofs/artist/ee6290f2-2496-4d7d-b183-c9c3161bd4a4.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 0xb2a92b84efdd409b2b761762d6859e69a57094924ddd80f9b2fbe7f4e7b4d779. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/COF016200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579d1f882a680d56075995f84fa498f3d46f7e55e95267c94f3de7958c17384b. 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/GBWUL2015896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a2ac326de6980575a70752a1a046eb26f7575a836ec714a34a7b4515e1311d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T22:41:33Z), 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/QZHZ42219827.
Rescatando los Éxitos Originales de Long Play - Calixto Ochoa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1402ec0ea093141ae1c62183c897c9d32e606674a1f47bfadbb52045071c13. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:01:03Z), 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/COF019401046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65f4cd978aaf015817646e926250e78217dcc97868f2d89fd52a2346500b6f4. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/COF019500952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de449f93ef9daa1bf1c7c359c5f630f454d372437239384d096c06c8aef66e8. 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/COF018900486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a92b84efdd409b2b761762d6859e69a57094924ddd80f9b2fbe7f4e7b4d779. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/COF016200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa733d9dce63ddc9139b30eefb1acaec088064457bad4faadaad2c9a498e72d48. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T13:45:55Z), 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/COF016700068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00dfc47633fc4c17ae8a42ca26204ac52e10a07124817d2a8ff2583cd7f95e5. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/COF019600503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5dd7b0f88ae365b0719633ae6dd817ae53adb748acad68fdd64764f3879048. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/COF018900719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d555c2e58705b560ab857bcb7f891944096d507fe09e5171a41a7cd7368dbe2. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T09:36:48Z), 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/COF014500075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b803f2bfcc5511210467f76b0803a263020908aa03324468b160486cf72066. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T09:57:53Z), 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/COF013900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de449f93ef9daa1bf1c7c359c5f630f454d372437239384d096c06c8aef66e8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/COF018900486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef398853e4d52f9793e4d52a9d067debedbdcb766564d0fb6b606d224cd17b9. 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/COF019600529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab31a5318d581e8ddfb891ae704debb792226b5a2cdc635606e85c1779e2d064. 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/COF016800042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8da5a5ba872c04720657eac8eef050790339c23970374238fe5d206350d60f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/COF019500946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9520c0026f83e6e87180fdeb6155e1550a640cf80def1ffb800092bb623bc8c0. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T14:14:50Z), 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/COF016900026.
Historia Musical de Calixto Ochoa: 40 Éxitos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2244a1cf561e43162d50f8429680feae7beb69ec6dd23877c886f81510438e34. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T08:48:58Z), 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/COF019500950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1402ec0ea093141ae1c62183c897c9d32e606674a1f47bfadbb52045071c13. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/COF019401046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00dfc47633fc4c17ae8a42ca26204ac52e10a07124817d2a8ff2583cd7f95e5. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/COF019600503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb058b349a2d95b04adeedc73b3bfa5e97da186f46d35ae895f57d4ee2fc42d6. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:26:10Z), 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/COF019501272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936c7119cbb5c05382aa32226853cee89f8424b0fc221a882f7614f824c9942a. 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/COF016900041.
Rescatando los Éxitos Originales de Long Play
Sigamos Gozando Con los Corraleros de Majagual
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6840a8b88ad666e7cd52017bd0498d962a2bd25e194e727ed45c119b496bb3c1. 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/COF019401731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcb5ed98de83c5833d06bbd76d1de6f8b5d1cf1efbe9dc1d01d2c49e1a2521e. 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/COF019401743.