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 0x9fee59ad95b43118c360e1c851c48df338c85a3051c7767426eb32dd12557092. 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/a2de53c6-5589-4aaa-86b0-289e6764a991.json and https://artists.proofprofile.net/proofs/artist/a2de53c6-5589-4aaa-86b0-289e6764a991.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vivaldi: Dixit Dominus / Gloria / Nulla in Mundo Pax Sincera
The Four Seasons, Violin Concerto in E Major, Op. 8 No. 1, RV 269 "Spring": I. Allegro
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 0x5d0b9ce99c5fdd097e2318ff22e6b98cb01a6daea86f71d36d0637298a5d1f97. 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/HKI199329401.
Gloria in D Major, RV 589: I. Gloria in excelsis Deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bc3df2819993eff37beeaf1b406b3304f1133189e8b1b0198b06f3fc13fce7. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/HKI199328701.
Concerto for 2 Mandolins in G Major, RV 532: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad14992e6d419650e939bd00808cbac7c24e563b4e1add8c886518d976437079. 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/USB8U1612680.
Concerto for 2 Cellos in G Minor, RV 531: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3be1e985f1fbf01181ea15dd6ed10fa7d947bbef613846676af222689745ad9. 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/HKI191411004.
Concerto for Strings in G Major, RV 151 "Alla rustica"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd471231bc1f75a116d0c7bc44c80be6655b63809c771f1a1824343a6df347277. 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/HKI190538505.
Flute Concerto in D Major, Op. 10 No. 3, RV 428 "Il gardellino": Flute Concerto in D Major, Op. 10, No. 3, RV 428, "Il gardellino": II. Cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9158a0a5535aa6ac6693973170bfe45c7c1665fec1a00a668af0b4e18448bbd9. 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/HKI199991017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4292509e9db35cff79293c224d1ab209c67e7162ebde22993b3725295ddc14. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HKI190121628.
Chamber Concerto in D Major, RV 93: II. Largo (Arr. For lute and strings)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df045b7dd622274e873286de57406592b9c07281d41a32cace4e107c9a85d85. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/HKI199594802.
Concerto for 2 Trumpets in C Major, RV 537: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8264960406b2cb9b57fe3efa2ec2c8911ec2c247f1c78d96ace9ae26b7ddcaff. 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/HKI199506411.
The 4 Seasons, Violin Concerto in F Minor, Op. 8 No. 4, RV 297 "Winter": II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3fff520fce4c75ace82b11d3aa8e2497973508a88f52ab7832f0b9a82e5b57. 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/HKI199329411.
Bassoon Concerto in F Major, RV 486: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7951f0c9861e59481e0f8f689e70a5a4e678c9857a70666460a0422d9158e4f3. 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/USB8U1612684.
Concerto for 4 Violins in B Minor, Op. 3 No. 10, RV 580: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21f6dee0e51382f9f652631929c6edc529afcf728107fb8fd3ac8a949140e2a. 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/HKI199329208.
L' estro armonico, Violin Concerto in A Minor, Op. 3, No. 6, RV 356: Violin Concerto in A Minor, Op. 3, No. 6, RV 356: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5856a54c8bec399db6e714cc92a2a990c96e5db1125fe902acb9c55ca6e289. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/HKI199991009.
Dixit Dominus in D Major, RV 595: Gloria Patri, Sicut erat in principio - Et in saecula saeculorum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c72141921cd4069cd3db68df1e52384451451fc4f1595a84dbf82dc4ec0743. 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/HKI190538613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f5119054303d49bd29ca84e2f2e3903ca1ad366f356a611b0b4d2cbdf5c661. 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/USB8U1612698.