thumb|alt=Dark-haired woman smiling at the camera|Sonia Theodoridou Sonia Theodoridou (; born 1958) is a soprano from Veria, Greece who has performed prestigious operatic roles internationally. Earl
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 0xe5569c0dd9b61005dcce5df422055612efe2794355cdc3aeba3d466472de063d. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d590914-ed04-42c2-b371-95cc79a8123f.json and https://artists.proofprofile.net/proofs/artist/2d590914-ed04-42c2-b371-95cc79a8123f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
I Sonia Theodoridou Sinanta Ton Mano Hadjidaki
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 0x26210ac3aaacf465f861efe6cd0756594609a7651d1a7dde81b8b6e6dc9b451f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GRMU12300046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7283d16bc342d4c95995f07845a4be04e52f008c86d327bd024f3adde9944714. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/GRMU12300045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e13b933063582d9e0be4c6ae361e1b8daa2915bdc48baf09cb6510e17a8fb97. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/GRMU12400001.
La Calisto, Act II Scene 4: "Da le gelose mie cure incessanti" (Giunone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c504f9189394a4b1352a2b88230a280f07153a9a839ccd539b95ba79b06e37. 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/FRZ149414050.
La Calisto, Act II Scene 5: "Sgorgate anco sgorgate" (Calisto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad887761e3be2fd3c33bf66d2a022537ce85571957d2e811a9873c15cdf6ca8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149414060.
La Calisto, Act II Scene 6: "Calisto anima mia?" (Giove)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7608cdb083032835d51b90a7826bd10f2437b41436310cf03d7182528697180c. 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/FRZ149414080.
La Calisto, Act III Scene 2: "Da le sponde tartaree a questa luce" (Giunone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b61d925dc1b7a3adcae60171b81bad8d81a016c5e083e2b10c362db7977f1d2. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FRZ149415020.
La Calisto, Act III Scene 2: "Mi si fa gelo il sangue" (Calisto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c94e4ae314d612d316b976c25c588a7c430c7b3bdecb29814a2e933c887a440. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/FRZ149415030.
La Calisto, Act III Scene 3: "Racconsolata e paga" (Giunone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b28ba177ebbbbb07d83d4b9eaa3e92e064a28194f4aa1b40fe73b0cd0d3e67. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FRZ149415040.