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 0x04bb3c32fc095dbf6af1b40ea93909f96a88b731ae33db5e4e355297b5a3320a. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/938ba263-de25-4f00-be57-2d38ae67da7f.json and https://artists.proofprofile.net/proofs/artist/938ba263-de25-4f00-be57-2d38ae67da7f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Isabella de' Medici : Lieta vivo et contenta
I canti di Euterpe : Composizioni femminili (XVI - XVII secolo)
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 0x165820b5abc9ed4318f44641e1ded10975bf2c1b3a1bbcab424f454992c395d7. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ITK341003115.
Vittoria Aleotti : Hor che la vaga aurora
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413b3d87e02aaafff8d70eb60be51c3e970eb414ee1b8d2bba357327587bbc9a. 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/ITK341003702.
Lucia Quinciani : Udite lagrimosi spirti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423cebdfb7adc83db53ee662e8ce2666019bb30457aee8f2db29bcf32275d830. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/ITK341003704.
Maddalena Casulana : O notte o ciel o mar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2829763784b401ed509ae884b1e65c189eb73fc90e90794c6128a1123ccc4cd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK341003707.
Maddalena Casulana : Vagh' amorosi augelli
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a68089769ee395fa513586f499a55db104fcab64f1002edcc50f2dbe0cc573. 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/ITK341003708.
Maddalena Casulana : Morir non può il mio core
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa660a68876fd36c9e7ad27abe0ae9458b666e5656e360a9bba29276eec2f7dac. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/ITK341003709.