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 0x4691a570d2dffd061710b6458c78c734fb65de486b7bafcf4c0b899ab83d490a. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f410e3b-142f-4f55-8035-f9cd11717dd3.json and https://artists.proofprofile.net/proofs/artist/5f410e3b-142f-4f55-8035-f9cd11717dd3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
L'Heure espagnole, M. 52, Scene 1: Señor Torquemada, horloger de Tolède ?(Ramiro, Torquemada)
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 0xc10b307e2adb360ee5022ad746c934cbfe7146e03b8a8a6ed09abe59324dcea1. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR4KC2303002.
L'Heure espagnole, M. 52, Scene 2: Totor ! (Concepción, Torquemada, Ramiro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7964e45fa9f8fa6ff747538be85c7c52373bc4091375017428635bd8eed245d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FR4KC2303003.
L'Heure espagnole, M. 52, Scene 5: C'est fait, l'horloge est à sa place (Ramiro, Concepción, Gonzalve)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5b92f458ea856a9ba722d248ebdf474b35d90960b453b4ac889f772e898428. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR4KC2303006.
L'Heure espagnole, M. 52, Scene 8: Voilà !.. Et maintenant à l'autre ! (Ramiro, Concepción, Iñigo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec2371b5235fe31a29c9e55a679f188afd1329f972ac13601332119a6de73a3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR4KC2303009.
L'Heure espagnole, M. 52, Scene 11: Monsieur, ah ! Monsieur ! (Concepción, Ramiro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3adcb95a380fe38fea11b935b4a560a62a9a63cbace887d0ae2d1bbf90f5c6bd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR4KC2303012.
L'Heure espagnole, M. 52, Scene 13: Voilà l'objet ! (Ramiro, Concepción, Iñigo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15bca777f868d5336ec5b86ad04d30eb6a6f850301e4d12d505f4d3046a3c0d9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR4KC2303014.