thumb|upright|Original libretto cover for Johann Adolph Hasse's 1730 setting of Artaserse is the name of a number of Italian operas, all based on a text by Metastasio. is the Italian form of the nam
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 0xd02621d3376b89fabc7ae31378077e149874e7978d03fc9d31c18f36ae927931. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/faf8a0ea-ccee-4c48-b0ca-71d5a1343208.json and https://artists.proofprofile.net/proofs/artist/faf8a0ea-ccee-4c48-b0ca-71d5a1343208.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vivaldi: Stabat Mater in F Minor, RV 621: I. Stabat Mater dolorosa
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 0x9d318f51d2da9131ce0040399baebec6988662f02059295d7b31edf7e907958e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBAYC1402077.
Vivaldi: Longe mala, umbrae, terrores, RV 629: I. "Longe mala, umbrae, terrores"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8208cee18ed8cd86d28c37cac65bf73ec0b932256d42b2665ad6b4422b1351d4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBAYC1901536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d318f51d2da9131ce0040399baebec6988662f02059295d7b31edf7e907958e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1402077.
Grandi: Motetti a due, tre et quattro voci, Libro 3: No. 21, "O intemerata"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa3aeb91fc8d5393a0032bb4cb49d268d1dab6c78c04cc0654507de30bdca83. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1901543.
Il trionfo del Tempo e del Disinganno, HWV 46a: No. 45, Lascia la spina, cogli la rosa (Piacere)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a53015bb7a6c1e3c547136e3541e6f65dff1673aa7aae3436a6c2bbd5d0863c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002536.
Handel: Arianna in Creta, HWV 32, Act 2: "Qual leon, che fere irato, se sua prole" (Tauride)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f40b588d0d889eee74b73e071c8038e6e0a5ae8be3fca92f51e546735725331. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW2100280.
Handel: Amadigi di Gaula, HWV 11, Act 1: "Il crudel m’abandonna" (Melissa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c916438cf5dfcb4eb2aba04047ded67dc7e9356f6b7fe4a3d3d1dd123db08d. 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/GBPFW2100281.
Handel: Amadigi di Gaula, HWV 11, Act 1: "Ah! spietato! e non ti move" (Melissa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a54067ca5b175d3cbf7a480d1919c7039b1c4c2b535014ecc252fc76e3b3af1. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBPFW2100356.
Handel: Deidamia, HWV 42, Act 3: "Ai greci questa spada sovra i nemici estinti" (Achille)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d8131d46773950947a47bc9487862afceb7d7e794a8aba02c73770eefb82b6. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBPFW2100282.
Handel: Partenope, HWV 27, Act 2: "Qual farfalletta gira a quel lume" (Partenope)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe618cf30cb5bd6bf19e10ef21a410450c0bcf6f297d268b83e81c371ce26a981. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW2100283.
Handel: Radamisto, HWV 12, Act 2: "Ombra cara di mia sposa" (Radamisto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503badf463f11268a522e720b08133e4cc0b3d42086a7d593015ce364fbab872. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBPFW2100284.
Handel: Alcina, HWV 34, Act 2: "Ah Ruggiero crudel" (Alcina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126a1209171b4a671e1458aee254478ad00d0d92de7ddba71ff33ddd7f984507. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/GBPFW2100285.
Handel: Alcina, HWV 34, Act 2: "Ombre pallide" (Alcina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf49d85cd6cc8e35cd6f1d3829ae776572e1b7abd67798e52566f4078fcb00b0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW2100357.
Handel: Faramondo, HWV 39, Act 3: "Se ria procella sorge nell'onde" (Adolfo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff076d5be60b3cd350a89f00920277e8b1780161aa9be2c458766f8c5837b0e. 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/GBPFW2100286.
Handel: Giulio Cesare in Egitto, HWV 17, Act 2: "Che sento? oh dio!" (Cleopatra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19363ed4d50965bb6ac13a65e1ce428f65109f65e5d1e11986bd47b22de1f3d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW2100287.
Handel: Giulio Cesare in Egitto, HWV 17, Act 2: "Se pietà di me non senti, giusto ciel" (Cleopatra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8da8b93b59481bf9b51beb06f11016b5b78a90b34273575d0f24a2fba4a40e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBPFW2100358.
Handel: Giulio Cesare in Egitto, HWV 17, Act 3: "Da tempeste il legno infranto" (Cleopatra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f184b4a186eabc65f4c0db74e99190ea0a8f0cdad4fe03642b618d0e3c6b83. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW2100288.
Handel: Radamisto, HWV 12, Act 3: "Qual nave smarrita tra' sirti" (Radamisto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd214c79d66b43421fe6b82ef5d8f7cfa8212e0e79f76485e70787f2e3aca6786. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBPFW2100289.
Handel: Lotario, HWV 26, Act 1: "Scherza in mar la navicella" (Adelaide)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be34067d347038a6e6d13c6a7665601515e040b6285620b9dea852a089afb7e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPFW2100290.