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 0x3f0a6571bb941c4ea8eefa18f145aa37a7a76019f81e743aa77f15cc2835fe37. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/059c5946-ee93-4b27-9f2b-d0328632f1ba.json and https://artists.proofprofile.net/proofs/artist/059c5946-ee93-4b27-9f2b-d0328632f1ba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonata for Two Violins in A Major, Op. 3 No. 2: I. Allegro
Leclair: Six Sonatas for Two Violins, Op. 3
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 0xd42a383ccf4d5a05dbd3192e3f41e88a0afedabdf186ffcc2b1c1b30557c6d15. 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/CALC41701114.
Sonata for Two Violins in E Minor, Op. 3 No. 5: I. Allegro ma poco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff595abc184f90eba1b902b1c1856cd971bcdb53233eb1d9691b21eb606a0fed. 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/CALC41701123.
Sonata for Two Violins in E Minor, Op. 3 No. 5: II. Gavotte - Andante grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa72f28b6591e3760adf919e775eaf8ec3daaf7ba71a055d30ce866ceb848fe. 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/CALC41701124.
Sonata for Two Violins in G Major, Op. 3 No. 1: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12fc2a5ef4f1251f37cf2ada6717e16d156d4736b319fecd22079b2e804f8ed. 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/CALC41701111.
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
Sonata for Two Violins in G Major, Op. 3 No. 1: II. Allegro ma poco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367eca8ba6f6fce6b930b14627fb37a63c0979aa59fd34ecf19d9a38cacf4516. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/CALC41701112.
Sonata for Two Violins in G Major, Op. 3 No. 1: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7885456d6b425a4ebd3de33284dcd6b1bc480b4fc13db126f8ab91b8bb44ece. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CALC41701113.
Sonata for Two Violins in A Major, Op. 3 No. 2: II. Sarabande - Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ee60fa5fc9d9b580cd5b60c93048d0f1cadbe7007bfa737abbe4e5406383a9. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/CALC41701115.
Sonata for Two Violins in C Major, Op. 3 No. 3: I. Adagio – Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad6c7e93867072747479b59cdec7d50e5a200158d3f683ba404ec28f6572329. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CALC41701117.
Sonata for Two Violins in C Major, Op. 3 No. 3: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678b40a81eade7851ee92e1c7d66be81101000392e4a31c266d5330c8447ae53. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CALC41701118.
Sonata for Two Violins in E Minor, Op. 3 No. 5: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6bb102b9a6d748f86495c8b4b1b4b76210b53dafb13b812250be9489d98ef0c. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CALC41701125.
Sonata for Two Violins in D Major, Op. 3 No. 6: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebd1ddd69aa461aae66aaefa75451fe4ea83d3b95bc3b934e3d9c7600082d2c. 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/CALC41701127.