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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa18f2b29fcbe8335e9b3fd67887223fa49bf20b0b2eae1cfedb96349a62c8cd. 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/564308db-bc8a-432f-8b54-52a2a696400d.json and https://artists.proofprofile.net/proofs/artist/564308db-bc8a-432f-8b54-52a2a696400d.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb3e1f43cf76518366938754ed171d1428fb649a78a0ecdb38eaa047b50a22a. 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/ARFSB0800490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea9bbc1614e3ff332c2ee6f1a232ecdc4357382b15cf16395d86fac459cf6ce. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ARF109903434.
Cuarteto Leo en el Club de la Popularidad
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75e7ec5ef198984d6cb447bc96f00604eb45e96f54089da2bd0eb8ccba57618. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ARF109903428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff2bacda7b4e6e264307c66eed9a122c3d3e40f2db0ae72249bd97955a73cde. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/ARF109902372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ed47ff037b5508444e05e3f118921cf7a822023e4bb02b0660a7cf5c34624b. 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/ARF109902196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe20f83896e33204295cbcdb6c4cd0e24d40971b5e9a1c7d3039717aeec4295. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/ARF106800258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d0d19c0410f88e306e1aa3a2b21a600832df76d17896cbff41b88db3fd118a. 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/ARF107000240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714a05de08e91a74160d416ec84384d19c764d628d9cb00d71bd4eec6a830ea9. 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/ARF109902184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8fd8c63d4ddc64d6fca54778baa2796f630c437833a493887a792d5daca527. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ARF107200342.
Todo Es Alegría y Cordialidad Con el Cuarteto Leo
Con Tu Permiso... Aquí Está Leo, Rey de los Cuartetos
Dale Soga Nomás... Que Va el 33 del Cuarteto Leo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc4f147a366fa9955c42c51d10a288432a8a00bed0a8a69ec7d4e5774eea13c. 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/ARF107900124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76333bc655257cec1fed9ffeff9a455cd53940a175e4426260863820508b8331. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ARF107900126.
Mi Vida Quiero Vivir Bailando Con el Cuarteto Leo
Mentira, No Hay Drama... Con el Cuarteto Leo
Te Pido Que Me Guíes Con el Cuarteto Leo
Quieres Tú, Quiero Yo al Feliz Cuarteto Leo
Ponele la Firma... Que Va a Andar el Cuarteto Leo