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 0x25babe392815d7c09bcc0a9928b863facf6427043515674572a80048882e0cb1. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/28af0fa6-d9fd-4af2-8169-e641d939b542.json and https://artists.proofprofile.net/proofs/artist/28af0fa6-d9fd-4af2-8169-e641d939b542.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Danzón No. 1 (feat. Orquesta Mexicana de las Artes)
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 0x62dadf2c8a210c100b288c7f773bc4bde0be38af23fb79a9f14d577c53ee60a2. 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/USCGJ1212862.
Danzón No. 3 (feat. Orquesta Mexicana de las Artes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e1ca7cf7c42c508656ccefbf7b4f2af7d7942b5c9a3b9c67df089caac81b31. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/USCGJ1212864.
Octeto Malandro (feat. Orquesta Mexicana de las Artes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53458668ee07707a6829d78dc1e8402461ccd497d9ec65ef14a0af8141a41050. 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/USCGJ1212865.
Danzón No. 4 (feat. Orquesta Mexicana de las Artes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf111c05569c07112ed250aa0df0eebc45d1b22a4416742f1f80a55904bd1d67e. 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/USCGJ1212866.
Danzón No. 5, Portales de Madrugada (feat. Orquesta Mexicana de las Artes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0746dca12510c8303ddfd46ac00a09f7175e35f32567bafb34d1d8c3dcee1019. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/USCGJ1212868.
Danzón No. 8, Homenaje a Maurice (feat. Orquesta Mexicana de las Artes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f289f731fa65e9440b7060c5cc7ac599e154f055ecf0ef1a07ae021e1a3335. 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/USCGJ1212869.