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 0xc84c0cff925131392e656f04c31001fc523c33c157f08b1d708d4c1cca12bd6b. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5a61f825-035d-4a46-a93f-db7b88c66190.json and https://artists.proofprofile.net/proofs/artist/5a61f825-035d-4a46-a93f-db7b88c66190.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Klavierkonzert Nr. 5 Es-Dur, Op. 73: 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 0x05fecb063d8bc4956744142cdd53215733f2c74bfc07bb86a7c016e34e79241d. 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/US2TL0924001 — a six-check JSON result.
Violin Concerto in D Major, Op. 61: I. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c188e8637a6aced2bf894141801ccf40a419e6493bae5c798c97318eb7320c7. 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/US2TL0924005 — a six-check JSON result.
Symphony No. 3 in E-Flat Major, Op. 55, "Eroica": I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e115cb601197626427be615f20508ac9240727928bb1fc4802dead1f0b1660. 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/US2TL0924011 — a six-check JSON result.
Bulgarian National Svetoslav Obretenov Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9719e6b531ac1be95bfc24d133d68993aa771e0b1d0b9fa26a2eceb13345f79. 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/US2TL0924016 — a six-check JSON result.
Piano Sonata No. 14 in C-Sharp Minor, Op. 27, No. 2, "Moonlight": I. Adagio sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa757ad5103febb3bf376ed4d746d769f9db6ebf024d85210353b348d23650e39. 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/US2TL0924024 — a six-check JSON result.
Klavierkonzert Nr. 5 Es-Dur, Op. 73: II. Adagio un poco mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3111637cf23de81ee2d151281355e3429a7497dbdd19f96bce0e2e7dd47e417. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/US2TL0924002 — a six-check JSON result.
Violin Concerto in D Major, Op. 61: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ab026026fd285de44d755542c0df59fe429118c782da07ec4fcfc49164ff15. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0924006 — a six-check JSON result.
Symphony No. 3 in E-Flat Major, Op. 55, "Eroica": II. Marcia funebre: Adagio assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60666dc3bfa62963efc3dcee60a1693715d378e6d192161c3d03f8435c6f140c. 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/US2TL0924012 — a six-check JSON result.
Fidelio, Op. 72: Act I: Finale: O welche Lust, in freier Luft den Atem leicht zu heben!, "Prison Chorus"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d158626c933daa10a1026b5ce36bdbd8e80a1c5eb480f600a6a914c4146adb4. 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/US2TL0924017 — a six-check JSON result.
Piano Sonata No. 14 in C-Sharp Minor, Op. 27, No. 2, "Moonlight": II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8de4ef11c787e15d95acd00ff115e963591696791f9e3f637cd82c4b0b3911d. 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/US2TL0924025 — a six-check JSON result.
Klavierkonzert Nr. 5 Es-Dur, Op. 73: III. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5a828ebf602a14db5d3c026924fa7bcc1de3684403c6362f564ad53c49a4cd. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/US2TL0924003 — a six-check JSON result.
Violin Concerto in D Major, Op. 61: III. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180773974904836fe015ac9d136ec182c37c2b0b2396c4c8676413101a2b0ae2. 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/US2TL0924007 — a six-check JSON result.
Fidelio, Op. 72: Act II: Introduction and Aria: Gott! welch' Dunkel hier!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996da3bbf6425776d675b5ab2c9aa06eda3725c83595c70642aeb65e1fe52a35. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/US2TL0924018 — a six-check JSON result.
Piano Sonata No. 14 in C-Sharp Minor, Op. 27, No. 2, "Moonlight": III. Presto agitato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6f83aa7f38122b47920630a546ade39a4554c18c623c50c4f3ffd936910334. 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/US2TL0924026 — a six-check JSON result.
Fantasia in C Minor, Op. 80, "Choral Fantasy"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb2f2c08d101bee54f7592fef6b8308721b2c8417253a85b50b6276b0deef84. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/US2TL0924004 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54af5149d05d07a6ba97fe42dbcc6d673fb035d6d2e94fa43e175cc723b03c16. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0924008 — a six-check JSON result.
Symphony No. 3 in E-Flat Major, Op. 55, "Eroica": IV. Finale: Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537627faca90609fcd159b23550fd25e34879f062bd1dd8837ab3ffc91c98af5. 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/US2TL0924014 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf87d25f581a52d61e9a63349ea20212cf6f78e9fcd431e82265cb66073b53d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US2TL0924019 — a six-check JSON result.
Violinromanze Nr. 2 F-Dur, Op. 50: Romance No. 2 in F Major, Op. 50
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437f4cf10f9343bbc1738db1f2f4ded6085e29cae90b6081197f7ebb133be4fb. 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/US2TL0924009 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24f8d70ca4ce1ff1fea18f86e62c6b83ddbed2d1e4e83b4138e845b7ba581d7. 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/US2TL0924015 — a six-check JSON result.
Bagatelle in A Minor, WoO 59, "Fur Elise"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dffa285e9649921e8587a034fde22ea2dd9980fc671ad001ccf16ec5a29f3d3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US2TL0924028 — a six-check JSON result.
6 Minuets, WoO 10: No. 2 in G Major (version for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdeb0280ea0cb79e42d49702b9218503dbdee34882410551322fd5fd9f4747e. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0924010 — a six-check JSON result.
Overture to Collin's Coriolan, Op. 62, "Coriolan Overture"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6aa31555fc0989c9647bf4900c02ff77c1722dc2633fd6fd31a207f0c233772. 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/US2TL0924021 — a six-check JSON result.
Zartliche Liebe, WoO 123, "Ich liebe dich"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014198264dcf4350111f1f98f00555bb3631d220f6959d29dc480d6ad4f8624f. 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/US2TL0924029 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5c1d8e60e366ae9c556296395a76392a1e2185cf8d4222995577f241114392. 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/US2TL0924030 — a six-check JSON result.
Sinfonie Nr. 9 d-Moll, Op. 125: 4. Finale: Presto - Allegro assai (Uhrwerk Orange): Symphony No. 9 in D Minor, Op. 125, "Choral": IV. Finale: Presto - Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a9d47d712a3bc682417101b41d57c92b22ee05a95d1957cee6a1f9c9f3d018. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US2TL0932850 — a six-check JSON result.
Piano Sonata No. 8 in C Minor, Op. 13, "Pathetique": II. Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd213cbbfe5c6af47828872d586038c290ac26913157721f7afecdaea08f91409. 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/US2TL0924036 — a six-check JSON result.
Classical Brain Power - Over 7 Hours of Music for Concentration, Productive Learning, Studying and Working
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9ce517aa0828d76a85c7fc05230d12a4f995862fa7f827775ceaa2e02a05e4. 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/US5541602954 — a six-check JSON result.