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 0x2cf747088ab61c3d6a7ec30915d365e7b41647b2d9471b8ca1c0b7aa3f184d6c. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b765c8ed-ae8b-4fc2-80fe-ed5a5918c009.json and https://artists.proofprofile.net/proofs/artist/b765c8ed-ae8b-4fc2-80fe-ed5a5918c009.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Otello, Act II: Se inconscia, contro te, sposo, ho peccato
Orchestra del Teatro Carlo Felice di Genova
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 0x28fb33c4c0478e2efeb99a904caf620052c5caa92d4299a5912110ececf41dea. 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/GB2DY2200297 — a six-check JSON result.
Otello, Act III: Il Doge ed il Senato salutano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a987e6b53b4d6d8acb9aeb03bb27b79621454655d43fd788e05af5f43d90d95. 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/GB2DY2200315 — a six-check JSON result.
Otello, Act III: Quell' innocente un fremito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54089ecb2bb51b70bbced4d8c3ca12fbacb45eefe891dcc1e569c94252110c9. 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/GB2DY2200318 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab0885e23c2cac83d200b83548869dc93fb515d5810663836ce5fb553526bfd. 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/GB2DY2200319 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349b214b9c5e81223c5e161d48dcdc17ae25f010c51e1c3670f9b8411fdbe399. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB2DY2200320 — a six-check JSON result.
Otello, Act IV: Piangea cantando nell'erma landa...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c24f826ccc947e327aa393303c1a72ab3c70d93f2ee8a488f023ea67131ba0c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GB2DY2200322 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2290e93900db6739ff64fc1c0f1ec92469b59484f3b54bc68f58f5765c00dcee. 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/GB2DY2200326 — a six-check JSON result.
Cavalleria rusticana: "Inneggiamo, il Signor non è morto" (Preghiera)
Chorus of the Teatro Massimo Bellini, Catania
Orchestra of the Teatro Massimo Bellini, Catania
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c0492c15757505d0080c9bc73ccc504ee07adb17cb7916ae1142f122f892c4. 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/ITZ040500027 — a six-check JSON result.
Cavalleria rusticana: "Dite, mamma Lucia"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4be431e8d42b232e9a06c821e357b5cb19f8fb2b8ddd252326a1730fb646f13. 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/ITZ040500023 — a six-check JSON result.
Cavalleria rusticana: "Beato voi, compar Alfio"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2994f913aae59447c7ddac23272a5bb7ac732152fdca1ae40ae9edb2d8d8de3. 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/ITZ040500025 — a six-check JSON result.
Cavalleria rusticana: "Voi lo sapete, o mama" (Romanza)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46de80d24e838b57a07b83002af2aa1831bbdc55fd44966044615e75f360170. 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/ITZ040500028 — a six-check JSON result.
Cavalleria rusticana: "Mamma, quel vino è generoso"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f179800ad27d68adc4747c34a3a4e85d82b30742f80acd509c2886976c5900. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ040500041 — a six-check JSON result.
Cavalleria rusticana: "Turridu? Che vuoi dire?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59e74fd9b512d8a05fc4487618a32e742a0629c558cbbf9f001f886a01a5ba8. 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/ITZ040500042 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f179800ad27d68adc4747c34a3a4e85d82b30742f80acd509c2886976c5900. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ040500041 — a six-check JSON result.