Horizons () is a 1913 oil painting by Francisco Antonio Cano Cardona. Horizons shows the idealized migrant family and it portrays a colono family –consisting of a husband, wife, and child– sitting on
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 0x3c55322148b7c12de53d604401ef1b2b08b92840682d8363fa2307ce54ca070e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1f2c9b1-f909-4ec0-967b-000d509a9959.json and https://artists.proofprofile.net/proofs/artist/e1f2c9b1-f909-4ec0-967b-000d509a9959.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Grupo Horizontes, Vol. 2: Expresión y Sentimiento
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 0x2eee6cc430edfd146176993fa34a0d7fceb5435cd79e8205853a41603c040107. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FR2X41637025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd717233c2e0e77a5ae25b9ac45ab0a0a25913e55006b99602a8b553859dcc22d. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T18:08:37Z), 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/FR2X41637026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933718ae5861c4aed3c21f6111148385f1f798c532705af189859065264129eb. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/FR2X41637104.
Van Diez Años (Folklore Andino de Bolivia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dee3cd9d83873d46b0f8da5c41b99aba4f5e58f318f87dbf7c795dca5798a52. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:09:27Z), 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/FR2X41461969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6343d5d0b82391ee4edc5036a9ebcc7f06aad23604a82a0d6da6bd8d62f13e4a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR2X41461972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53542e35351621fa420b6151e4870a7bfe788583741cb41d5e3add17478ee26. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/FR2X41461974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28e549bbcda7a8af59ad6c41eb85d3e8b320110461b520574895f1fdffc2dee. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/FR2X41461980.
Lo Mejor de Horizontes, Vol. 2 (Música Boliviana)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09f605f893fc8e84140f310fe2b0298fb1753a907ce5f614ffaaf3ce1d8ec6a. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T04:27:45Z), 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/FR10S1525135.
Grupo Horizontes, Vol. 4 (Bolivia y Su Folklore)
Recuerdos (El Mejor Folklore de Bolivia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f559a4b10dc07cf2297b7b57bca102c44d4dc77f5f52b991fd6cf3ebe7ebd79. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZZ972443220.