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 0x9d57084be3ae1a2258d3bb9a290bcd00ca5009ec0a0b745e5932ebd112cd76a9. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bc4fface-8790-45d9-a6ed-81d57e56c4f6.json and https://artists.proofprofile.net/proofs/artist/bc4fface-8790-45d9-a6ed-81d57e56c4f6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Don Giovanni, K.527 / Act 1: "Madamina, il catalogo è questo"
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 0xa5ccf854551714b5a70413395f6aa34ae598e2db4410c0c6a5746b593e38fe67. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEN961002250.
Le nozze di Figaro, K.492 - Original version, Vienna 1786 / Act 3: "Vedro mentr'io sospiro"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901d102c3125163dc56b58265cb6eadfc70f6f48644cdc7394a0b6f322570abc. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEN961002242.
Le nozze di Figaro, K.492 / Act 1: "Se vuol ballare, signor Contino"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fefeabc32c5fca0b1be6d1c962dbdc7dd675f0d23b1abb52abf3f12d35443fd. 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/DEN961002222.
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
Le nozze di Figaro, K.492 / Act 1: "Non più andrai"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a675116dcdbeb3ec4a78062926313d7aeaf1c7e125a8fa126ff156905d7e4af. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEN961002232.
Le nozze di Figaro, K.492 / Act 4: "Aprite un po' quegli occhi"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4550327904deed0f0462a606bc9ca27f7def298020ee08cd0fca3541a2dc8f32. 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/DEN961002312.
Così fan tutte, K.588 / Act 2: "Donne mie, la fate a tanti"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dac292c21d3e6813ed66751c5ca10faea27b9b718a6cd7132c56d78d3afe2f5. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/DEN961002280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0360e6baa4d605baba885cf69aaea9139dc6ea72c11bada6bb0cdb6ae8db67fe. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEN961002330.
La Wally / Act 1: "Ebben? Ne andrò lontana"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501ae9ecf032a7dc6fb4bca662e17a67706abea8d11c9127e9cb1d7abd6b213c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBF079541401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501ae9ecf032a7dc6fb4bca662e17a67706abea8d11c9127e9cb1d7abd6b213c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T00:51:44Z), 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/GBF079541401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501ae9ecf032a7dc6fb4bca662e17a67706abea8d11c9127e9cb1d7abd6b213c. 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/GBF079541401.