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 0x6314c1ae92926e5cd782f12975a818d4ec2f650f522ff554698b26d435cc00f4. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e499084e-6273-4e77-88e4-7c9c1fcdc62e.json and https://artists.proofprofile.net/proofs/artist/e499084e-6273-4e77-88e4-7c9c1fcdc62e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sonate pour flûte à bec, basson et basse continue en la mineur, RV 86: I. Largo
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 0xf2bf412aa77b59fa0ba474fa0c950afd343bc4c8bb65e37f091336b4636d0910. 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/CAJ721775301 — a six-check JSON result.
Sonate pour flûte à bec, basson et basse continue en la mineur, RV 86: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f51e692dba7f6166b3705d1d9bb6ce10b37b459bd074ad0525a97d92373635. 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/CAJ721775302 — a six-check JSON result.
Sonate pour flûte à bec, basson et basse continue en la mineur, RV 86: III. Largo cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe545af6916f3e60ca094dedf61215184b78c31c0e5a7d5ebab561caf45d50b26. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ721775303 — a six-check JSON result.
Sonate pour flûte à bec, basson et basse continue en la mineur, RV 86: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea1c573daceda849d581d1eb268e373db8cc66e24d8e7545b14ff59a6377910. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CAJ721775304 — a six-check JSON result.
Sonate pour flûte à bec et basse continue en sol majeur, Op. 13 No. 4, RV 59: I. Preludio (Largo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4748d01deadc96d757fc0e3ce4b3b28a694e3dd11f6a52fd67a15d046f0ac7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ721775305 — a six-check JSON result.
Sonate pour flûte à bec et basse continue en sol majeur, Op. 13 No. 4, RV 59: II. Allegro Ma non presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9aa0318734bba4cdf174c1cde55ba628a1eb9654864663b6289e768928363f6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ721775306 — a six-check JSON result.
Sonate pour flûte à bec et basse continue en sol majeur, Op. 13 No. 4, RV 59: III. Pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c891f5e48f06dac58eddc81abde9b995126e4de8e4b61890ca61c162ba273f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ721775307 — a six-check JSON result.
Sonate pour flûte à bec et basse continue en sol majeur, Op. 13 No. 4, RV 59: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ed393dba041ec99cfd0d388adc4381b14f543f851c6327d7f833695b5e3797. 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/CAJ721775308 — a six-check JSON result.
Cello Sonata in G Minor, Op. 1 No. 4: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacadbd2ee1e379fe410ffe5ab83028cdd644a976d07f2af2d26bb95d295a4aa9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEE022212301 — a six-check JSON result.
Cello Sonata in G Minor, Op. 1 No. 4: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48ebe9de82e2dccdec8ed63bd5758f183d94930132bda0adb47e1d792f4c9df. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEE022212302 — a six-check JSON result.
Cello Sonata in G Minor, Op. 1 No. 4: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1419f4bb388edb18ae528a41786ced01d9d67b11fd2c62fafe8326a7c683f2. 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/BEE022212303 — a six-check JSON result.
Cello Sonata in G Minor, Op. 1 No. 4: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301451de7315d0235a582dd72717ccf98c661e21cbba1e89faae2ba54003cd1e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEE022212304 — a six-check JSON result.
Cello Sonata in B-Flat Major, Op. 2 No. 2 "La Dupleïx": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae7dbe2255fb3536939aed081af3b44124fcb24b81dc0ed2c762859c55b6cb7. 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/BEE022212305 — a six-check JSON result.
Cello Sonata in B-Flat Major, Op. 2 No. 2 "La Dupleïx": II. Adagio amoroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fe93c67566ff6a82064eb7220be09e501c59b96f6dd072364a095e365ee26e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BEE022212306 — a six-check JSON result.
Sonata for Harp with Singing Accompaniment of Keyboard in B-Flat Major, Op. 8 No. 3: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b7345fc18ae278ddef7b2aa818071c01069893e7d82e25c3cff5a6e060ee76. 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/BEE022212308 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4801facfcc6ace09b46f9a4c497d569c0b522a157c27e2acd7b8ec63b60d5a2d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ721978018 — a six-check JSON result.
C.P.E. Bach: Fantasia and Fugue in C minor, Wq. 119/7: Fantasia
Schieferlein, Telemann & C.P.E. Bach: Sonates en trio
Sonata a 3 No. 1 en mi mineur per violoncello concerto, violino concerto, e basso continuo: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029c0bbd19e4bcd19e528e50b50e31e786b1f3dfd4d48be204e3cd0c339f6efb. 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/CAJ721774402 — a six-check JSON result.
Guided by Voices: New Music for Baroque Cello