Charlie Cardona (born July 8, 1967) is a Colombian singer. In 1990, he became the lead singer of the musical ensemble Grupo Niche and at the 11th Lo Nuestro Awards he was nominated for Tropical New Ar
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 0x42dc05a4411631f6bd9afe06195912332483d78f6e916c86f1f2db1473aa8b91. 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/0519e681-6729-408e-bd75-ac3120cdd48f.json and https://artists.proofprofile.net/proofs/artist/0519e681-6729-408e-bd75-ac3120cdd48f.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 0x3cf87056cb260dfa2c7d32ab2de2e5e116a725baf10ed35f5e7efd0a8f9e3cdd. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T02:40:58Z), 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/QZPYN2361821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea1640f6bc07298751b790e8db6e607fa82db43d47f46b7d64273eca3b37de6. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZPYN2361825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd13a382f368b244cf46f1b72ca62a365175f0295c2d559820bf1c5775592d33. 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/USL4Q2277472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286a26a50b4193fffe749946a93fb9747dcd6f220d5fde2fff6678e7d04b9fc8. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T21:41:22Z), 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/USL4Q2277476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cbc2825d7233a6dc6f1e956b5e3494688fddce7bf905f9ae2a2d11173f9b31. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/COA4Q1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5284c89a93f95ddf0be926da2e6d6e5953f521fa609d87386a96e0d8898859. 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/COA4Q1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9af224f11d57e412b9c52df814834e697a199814daa060c10c540c61df940d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/COA4Q2000611.
ZAPEROKO La Resistencia Salsera del Callao
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29732efe5c80165985fa70315cb4d097967874cbf425a09fe04a6774c49b55ef. 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/QZHZ52062532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ccdcfd9e86333bf01b683d0bc36a67d365127bc15a75075a8dba294e49abd2. 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/USHM81427546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f00d01631f61a30c0ee612bc51990438c113ad7273c80871ed8360ec1264c3d. 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/QZ5AB2110448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4013297ec91f60d88f94e6d0de1f255152afbe325de7912e3a32f21513ad14. 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/MXF011700655.
Grandes De La Salsa Homenaje Al Grupo Niche
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1f6b505c99129afefdb4338f8d84f3b862aa188f4792903e2460bdbba36098. 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/COC010225257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd499d78f5906db6666add38000da1bfd5914e6c438741b7253d83c7785b5add7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/COC010225251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec590ca3c2dc9e9de4583bce24275f021a334273e2e91d3c3d81282bc95025b. 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/COSO11300046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6bf5357ceff73c89ed5effe460a06baf2f96f8687b736a1b69554788545ee4. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/COC010425880.
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