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 0x8f7bad684804bdf8f39b1243486b97f0cfbe51ad9159357eb24df5eddccebcad. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a177aab0-ebfb-4baf-8743-3d485507fde0.json and https://artists.proofprofile.net/proofs/artist/a177aab0-ebfb-4baf-8743-3d485507fde0.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Bassoon Concerto in C Major, RV 469: 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 0xcd8e3f8efe90ec963a166c3028898e4c096e6c78fac70e2d4cca20a6986592de. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429010 — a six-check JSON result.
Bassoon Concerto in C Major, RV 469: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f026bf14e470b5c9ac22f3c647c60d75eb07afc076351e4b927cb03d86cc005. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429020 — a six-check JSON result.
Bassoon Concerto in C Major, RV 469: III. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d79533cf877703a539fb813bf6b4394c2a0d0b4727cfa5c1d69bde2172dc41. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429030 — a six-check JSON result.
Bassoon Concerto in F Major, RV 491: I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6b3a50605b59eaf1ee2aa0edade998dc4ba0d3cd9b07e603120b77205da32a. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429040 — a six-check JSON result.
Bassoon Concerto in F Major, RV 491: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662a40c94ff49a8b75ae84cf0b00daba7c3431d33a0363ae39af12796a5cfddc. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429050 — a six-check JSON result.
Bassoon Concerto in F Major, RV 491: III. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18866a7712721e4573c6c840871ae3bf1c8027d84fae643bd2522d10616dd879. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429060 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 498: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0adee2292e40e046ed1f6331a0a499215778cc6506ea051dd2125b109d7e56ee. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429070 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 498: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cfd502401af1e41150c3fe00af3fa1232f4bc54f0508be9a15d1b9898184964. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429080 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 498: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645cb2ae06e4b1f171bedf8f6dbe893aa9b4ee97fa502773114a12fae8439dc2. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429090 — a six-check JSON result.
Bassoon Concerto in G Major, RV 492: I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a4fc3dd7c669e2b11f20c9a511b9cae110c83bd835a64398a5805cdad94e4d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429100 — a six-check JSON result.
Bassoon Concerto in G Major, RV 492: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eca2cd8c363dc506938e85c0628ed505de96826b7701cbbc935bbd192c9da7d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429110 — a six-check JSON result.
Bassoon Concerto in G Major, RV 492: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19eb63661f2d19034c9448815fee90705fdd1dbad391835b09b319c5209fe93e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429120 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 500: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83146bc2dcb50ddddd5e6e22c779c12ae6859ffc7a094b2ea2b30dad95473cb1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429130 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 500: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b26998198f314bd46a02409a82656fc51682a63bd2308464e91c0ff6d5690db. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429140 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 500: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabcfcc756ffafbefc89ad8c560abba23cb933eb7a91a22e6713824e47ac58d97. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429150 — a six-check JSON result.
Bassoon Concerto in C Major, RV 473: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa434cb1243731f3607ae1b5e834b2d579015d03edd95d6d11cea2fd8cd35840. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429160 — a six-check JSON result.
Bassoon Concerto in C Major, RV 473: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3673d5df6de5ffcd647511970c8af198921da73bdc6c44f7cfcfcfdd94d49b7a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429170 — a six-check JSON result.
Bassoon Concerto in C Major, RV 473: III. Minuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5175bf8e4a56a5c5f89670ab6120f6ae962a4b2450ea2596affc9427e0b8d08b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131429180 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 497: I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331d2c8d2dc4a52b2f438beaced33cd856852ad511acd06032055468357e67e8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132004010 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 497: II. Andante molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c65c2fc95d45b1214f71b88a3a6fdf78aee1f4b044b5bab6f1729747387994a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132004020 — a six-check JSON result.