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 0xc1ee8f875dd197b9b74d32af79102fb530d4a8426c20a6fdcbedae9515d84a58. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b61b0586-152e-4b52-adfa-bbb093f51c28.json and https://artists.proofprofile.net/proofs/artist/b61b0586-152e-4b52-adfa-bbb093f51c28.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
La sonnambula: Act I Scene 1: Vi ravviso, o luoghi ameni (Rodolfo, Chorus)
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 0x973b2766f5282df67d1061e50a45da73c2fc3d0d024e9b19458c42064ffeff8b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1509533 — a six-check JSON result.
Verdi: Rigoletto, extraits - EP (Mono Version)
Grandi Voci – Mario del Monaco canta Verdi, Donizetti e Bellini- Una collana con registrazioni originali Decca e Deutsche Grammophon rimasterizzate con le tecniche più moderne che ne garantis
Orchestra dell'Accademia Nazionale di Santa Cecilia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58fe893ba46ab84ba921297336f842d244183d81c11dbdf8f397ecf9b7e726fc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075311390 — a six-check JSON result.
Coro dell'Accademia Nazionale Di Santa Cecilia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d25219619f0563f311bb7156b83190f72f53d916bfb614b3df61fd7b31a2ce. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075440701 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733f198285a0f0a039b19f0c479395ede5aede3d3f63e7851d3d5da1437d481b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075440702 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae036260844c67e9bc130aa24c71e768cb1f98f1028d6ecdaef5f59b1377493. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075440704 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831a14df54fbd8caf2e050282c924516d08f0389f907a1cb863c82d6233b07b8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075440728 — a six-check JSON result.
Otello / Act 1: Già nella notte densa...Venga la morte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88bbc16e716f438638f5988300c88b9f07af3f147b2ac47920e407cb3e354d18. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075440709 — a six-check JSON result.
Otello / Act 4: Mia madre aveva una povera ancella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30b5cc6e8afcde4c44d0c5485d01436c7ae5636a719f5da436d27376ac58b70. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075440739 — a six-check JSON result.
Otello / Act 4: Ave Maria, piena di grazia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ea818cfd3a85fd5e1a43d7238f95f85b9828b6b42ceb4bd318cd218a24bcd7. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075440741 — a six-check JSON result.
Rossini, G.: Barber of Seville (The) [Opera] (1956)
Il barbiere di Siviglia (The Barber of Seville): Sinfonia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cbe3c870fa88475d93ca6e7c889804bcd8f3ad2a67094bcf780743f1c6dd86. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1006599 — a six-check JSON result.
Dokumente einer Sängerkarriere - Giuseppe Taddei
Aprite un po` quegli occhi (Le nozze di Figaro)
Orchestra Sinfonica di Torino della Radio Italiana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6214c26e911ad2311cc853de0a27f1b8ef52036724df884ee0b8c7e66d810c7f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATP130250201 — a six-check JSON result.
Rigoletto / Act 1: "Quel vecchio maledivami...Va, non ho niente"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcbb5381e0bad8edd74e008e41dad595478a338be0155e1b16be03f15a5e7a70. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075440806 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda289595c123cf89ad69048ac1acd891302b2f4ca843171bf90ec09cb1067986. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATP139107407 — a six-check JSON result.
Rossini: Barbiere De Siviglia (Il) (1956)
Puccini: La bohème, extraits (Mono Version)