Antonio Sartorio (1630 – 30 December 1680) was a composer active mainly in the Republic of Venice and in the Principality of Calenberg. He was a leading composer of operas in his native Venice in the
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6e89cc30e3d6b4ed609a27c14c89293cd9a33ee212565cf649d80a553791d4. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6512a43-265e-4755-b48f-de062b22e246.json and https://artists.proofprofile.net/proofs/artist/e6512a43-265e-4755-b48f-de062b22e246.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sartorio: L'Orfeo, Act 1: "Cara e amabile catena" (Euridice, Orfeo)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14edeed8f2530e388526cd7e6263dd3dc211506b9cd9bcbc38a7aef1a854f990. 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/GBAYC1901541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac22bf41e6cd6bdc3bd31c47285cd9af6b472125a855b691b666da11694dc66. 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/DEN960901870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e133c241a2ff83dbd46dee14fbbe938d670921cced7391696525d4e96a113c. 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/DEN960901980.
Sartorio: Antonino e Pompeiano, Act 3: "La certezza di sua fede" (Pompeiano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe19786ffe3b81d29cdc9b6f8cfe1d24a776560d428a0a83d4902c4147062ff41. 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/GBAYC2301503.
Giulio Cesare in Egitto: Quando voglio (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930a7bfccc947dbee024f619c8e282906e7874639d0ecd9c37853505f09047a1. 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/DEE861701239.
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
Giulio Cesare in Egitto: Aria "Non voglio amar"
Serpent & Fire: Arias for Dido & Cleopatra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179a7dd737059137a95032402bbaca97e9aa394c4cfb640f823a6d1c845e3b7b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR50X1525004.