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 0xa211e002abc34f62c84a5c6de670d5b0b369f2a7cdd2100ddafcebbb19699416. Chain 2 (Bitcoin): anchored in block 953938 (2026-06-16T11:35:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20b1ddc2-1dc6-4ea0-ab7a-e245ab28cc41.json and https://artists.proofprofile.net/proofs/artist/20b1ddc2-1dc6-4ea0-ab7a-e245ab28cc41.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cello Sonata in B-Flat Major, Op. 14 No. 1, RV 47: I. Largo
Vivaldi: Sonate per violoncello e continuo
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 0x16fca0b1dba6a13815a3fd13ddc3c4c990291bcd9cfe1e7890a817af7affbfb1. 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/ITD552006401.
Cello Sonata in B-Flat Major, Op. 14 No. 1, RV 47: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b1cdd860fd13dc36e8de722844f575bb2e75f0f61643d29ad719acca016e56. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ITD552006402.
Cello Sonata in B-Flat Major, Op. 14 No. 1, RV 47: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140df3763b369bae2789d36c651b669ec9935d9c54b9e7a191a286eb20a7f1ce. 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/ITD552006403.
Cello Sonata in B-Flat Major, Op. 14 No. 1, RV 47: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78370b790a6eaae11dfb6cf4cabff34353c3d257db9f6a0d59afd756afd3eb1b. 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/ITD552006404.
Cello Sonata in F Major, Op. 14 No. 2, RV 41: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c734e3bb3dd2f16ce881312b0f59f2711ca36ced37c625629877e839f48b00. 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/ITD552006405.
Cello Sonata in F Major, Op. 14 No. 2, RV 41: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd4676423c136176a34527f07d733728e0e01c82b5106b1acfc07cfe145e552. 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/ITD552006406.
Cello Sonata in F Major, Op. 14 No. 2, RV 41: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dfc44b081729db2862794f838e3ae3080886422793c2cf8a2c39436c5c28e8. 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/ITD552006407.
Cello Sonata in F Major, Op. 14 No. 2, RV 41: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ef2eca39f4ec1f87600d70ae1244eaa807581bdda9642dbb9431a45d710a61. 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/ITD552006408.
Cello Sonata in A Minor, Op. 14 No. 3, RV 43: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88c8467ee40cbd7911c7d50ef5b24d4d6d39ff1f36036626a16843172787770. 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/ITD552006409.
Cello Sonata in A Minor, Op. 14 No. 3, RV 43: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bf039eb173f9a7874f0619913b7928ff66ba5feebd88b84a6cfe9b619f5927. 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/ITD552006410.
Cello Sonata in A Minor, Op. 14 No. 3, RV 43: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf3747aeac037101381533f2a35aff9dfcf879fd52d915fb0ae58a78b28f406. 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/ITD552006411.
Cello Sonata in A Minor, Op. 14 No. 3, RV 43: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31188b70fb790c1b85b08e5bb02cfd4e354fe381b9ac76c32d746c86c14509f7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ITD552006412.
Cello Sonata in B-Flat Major, Op. 14 No. 4, RV 45: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f52b55fba0dc0d0edabbe4f0ce4596665fd03bb2ca97399c49f7c6c40791ee. 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/ITD552006413.
Cello Sonata in B-Flat Major, Op. 14 No. 4, RV 45: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac942bec58e955a54bb289057a1fba524958376bd5933436e88bfd2202433dc. 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/ITD552006416.