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 0xb191cf6be87e1a356fce4d17cc4be6532ef8818b018a0baf3c0feb1e2e663b67. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b37c9573-4205-4cf4-aa3e-7f5d54759b5d.json and https://artists.proofprofile.net/proofs/artist/b37c9573-4205-4cf4-aa3e-7f5d54759b5d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Telemann: Works for Violins Without Bass
4 Concerti for 4 Violins, Concerto in G Major, TWV 40:201: I. Largo e staccato
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 0x1a0197e0226c59f0dc443fa54af998f3dfda410de379b855c7b0b75582099ceb. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/BEE022212601 — a six-check JSON result.
4 Concerti for 4 Violins, Concerto in G Major, TWV 40:201: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd9dcb2c3f2bd2bfe444575890b83bc4b62ee76e2c02f4e8f82a12e9c76ba22. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/BEE022212602 — a six-check JSON result.
4 Concerti for 4 Violins, Concerto in G Major, TWV 40:201: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaea4f1aae046a204c74716a5692c24eac9122aebc83d1cc4fcba517b2171c3e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEE022212603 — a six-check JSON result.
4 Concerti for 4 Violins, Concerto in G Major, TWV 40:201: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92fb25ae1a7a2bc43a84b9c86bbbebf349c4cc383ca78da4ea7998844f4b327e. 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/BEE022212604 — a six-check JSON result.
Sonata for Flute and Violin, TWV 40:111: I. Dolce - Version with Two Violins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c711fb3f7537082c38d664057986c7920500960fd461db0cfe0e9697a6f8a8. 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/BEE022212605 — a six-check JSON result.
Sonata for Flute and Violin, TWV 40:111: II. Scherzando - Version with Two Violins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf9fb4c9449199b0f54e4273e9949b279b31161b7414bfc321061406ca9588f. 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/BEE022212606 — a six-check JSON result.
Sonata for Flute and Violin, TWV 40:111: III. Largo e misurato - Version with Two Violins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba40c38d47a80ad46752aaced8af42ca0333a9497f79773998bc7ee5d6245ce. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEE022212607 — a six-check JSON result.
Sonata for Flute and Violin, TWV 40:111: IV. Vivace e staccato - Version with Two Violins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1dd02c5f7a8eafdc92834a7dbb4efd04aa7b525cfc1a3d743a6ffe4a938638f. 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/BEE022212608 — a six-check JSON result.
4 Concerti for 4 Violins, Concerto in D Major, TWV 40:202: Ia. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f79eedd4080a748ec1472430da8b2fc102a5a365a7c78447faeca6d9098b67. 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/BEE022212609 — a six-check JSON result.
4 Concerti for 4 Violins, Concerto in D Major, TWV 40:202: Ib. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f70a3227c021152f22ae954bd27603a5a20884a8db3847e5fae10db53aa841. 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/BEE022212610 — a six-check JSON result.
4 Concerti for 4 Violins, Concerto in D Major, TWV 40:202: II. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71651d60392051756cb632db5f2bf0f56c44e2697b50e1e63c602260e0f5fa5. 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/BEE022212611 — a six-check JSON result.
4 Concerti for 4 Violins, Concerto in D Major, TWV 40:202: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107aec9abb0c4f9db876ef382a46e910477407820435d2ab7c602cb9d632e2ea. 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/BEE022212612 — a six-check JSON result.
6 Sonatas, Duetto No. 1 in G Major, TWV 40:124: I. Vivace - Version with Two Violins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92100e742b0dd8e3d52abd9dccded5ea34b70538917ab3d3f45106cd4e66f028. 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/BEE022212613 — a six-check JSON result.
6 Sonatas, Duetto No. 1 in G Major, TWV 40:124: II. Allegretto - Version with Two Violins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ea8d6235b20b7adc92ae92e3b3d6ffcc1d892670b46ded831a74e674c79b8d. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/BEE022212614 — a six-check JSON result.
6 Sonatas, Duetto No. 3 in B Minor, TWV 40:126: III. Allegro - Version with Two Violins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbaae885c4ca5ec841277bd8258b8d3a8b8697ddcff8d877259a0a9e44473f1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEE022212618 — a six-check JSON result.
4 Concerti for 4 Violins, Concerto in C Major, TWV 40:203: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa639128973b86bceb9a8c75e183801f4f9ca78691de01453cae466d0d3c608ca. 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/BEE022212620 — a six-check JSON result.
6 Sonatas, Duetto No. 2 in A Minor, TWV 40:125: I. Vivace - Version with Two Violins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefddb1a37c9859dda571d87a36ce2e7b2e57b172346cc6ded907f1713e0d2cdb. 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/BEE022212623 — a six-check JSON result.
18 Canons Mélodieux, Sonate No. 3 in D Major, TWV 40:120: III. Allegro assai - Version with Two Violins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52fc4be586e9c2b84806708a5f40c1e52f5015685baa29224a83501db2ca22c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BEE022212628 — a six-check JSON result.
INTO NATURE 自然の中へ ヴィヴァルディ『四季』(全曲)と母なる大地の様々な音色たち
Sinfonie ad uno, e doi violini, a doi, e trombone: Sinfonia quarta "Geloso"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a7e311f03fffb0972f30006be43eea1b51fdb1989bd06b20ad5cc99d25d858. 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/BEE021907010 — a six-check JSON result.