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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a1e7ebd9e696499bf5c7a5ff7fb2a079afc42c202043e26b02039880105584. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/500ef00f-fdaa-4288-9537-406201d6eebd.json and https://artists.proofprofile.net/proofs/artist/500ef00f-fdaa-4288-9537-406201d6eebd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
String Quartet No. 12 in B-flat Major, K. 172: Ii. Adagio
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddaa90464d4c2f24b636731e407fdee23c37b485960bad1deb0d70e54255f158. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199494702.
Clarinet Concerto in A major, K. 622: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd82c111e5540383f6662d81160367bd6f8fe599fc502363736c9990855d68a. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/HKI199273708.
Symphony No. 40 in G Minor, K. 550: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882cf810d209a1e21e35707cd18c47c172e4acb64c40097d88800fb3e36ff929. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199281202.
Horn Concerto No. 2 in E-Flat Major, K. 417: II. Andante
Amadeus Chamber Orchestra of Polish Radio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cc94a840024a469b2720d5a052d31b37ee2714098263f1ccddcd631690addc. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/HKI190712104.
Piano Concerto No. 6 in B-Flat Major, K. 238: II. Andante un poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe451996f3e77d7bedbfbd3ffc9887fa815d30787abfcb1f7cf5ed32f270bf61b. 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/HKI199276405.
String Quartet No. 20 in D Major, K. 499, "hoffmeister": Iii. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b7724ab85e0f70841b8b0f0d40d6aa54f28b9b7f40369c8a82db15190d034b. 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/HKI199279003.
Piano Sonata No. 17 in B-Flat Major, K. 570: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c6768a9e5d93798e8514b09a4db21031c2ad6f5791ee783431e05324eab171. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKI199277605.
Symphony No. 39 in E-Flat Major, K. 543: II. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8d797893bc8b1a80af07008070b714d432990ea791d48518a1f8d22c21273a. 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/HKI199280709.
Così fan tutte, K. 588, Act I Scene 2: Terzet - Soave sia il vento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c577058320ba017cb97177354dd778cf0bbaccec23051cdda50a7a6e16c785. 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/HKI199092719.
Piano Concerto No. 23 in A Major, K. 488: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543cf7c80e36778f3c88fde8c5e4392179515504c2e8ae098bf5b1991abc3d46. 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/HKI199276902.
Clarinet Concerto in A Major, K. 622: Ii. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd82c111e5540383f6662d81160367bd6f8fe599fc502363736c9990855d68a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI199273708.
String Quartet No. 15 in D Minor, K. 421: Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb645db50915c2219d60eceed4ce13b9ea7b714040a24af7dc002bf5036c9081. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI199494810.
Serenade No. 13 in G Major, K. 525, "eine kleine Nachtmusik": Ii. Romanze: Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0e719cfca95da0ebc40d6ac033333a217864965629cf43f4518b091a2acad0. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKI199274702.
Concerto for Flute and Harp in C Major, K. 299: Ii. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d353ac06dc2091a504a012d0f66a4967a258c9df92ea4b69ecd8815c066d99. 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/HKI199274202.
Horn Concerto No. 2 in E-flat Major, K. 417: Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cc94a840024a469b2720d5a052d31b37ee2714098263f1ccddcd631690addc. 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/HKI190712104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddaa90464d4c2f24b636731e407fdee23c37b485960bad1deb0d70e54255f158. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKI199494702.
Serenade No. 9 in D Major, K. 320, "posthorn": Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009f2ec5318acd67f2c1e254531d6d89c94c5966b2010fbac3dd53a56eaff4a1. 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/HKI199273505.
Symphony No. 40 in G Minor, K. 550: Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882cf810d209a1e21e35707cd18c47c172e4acb64c40097d88800fb3e36ff929. 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/HKI199281202.
Piano Concerto No. 5 in D Major, K. 175: Ii. Andante ma poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778c9aea2e74a8ff781d49ddcbdc6d41f39d0768173a324e82821df1d45c5f17. 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/HKI199277105.
Piano Concerto No. 25 in C Major, K. 503: Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3091771f5af97be7154f629b9635f2a94e6abc8c30a848378dad4491598e6169. 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/HKI199276208.
Symphony No. 14 in A Major, K. 114: Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb74c6e0c0372f9ddddbc44d6a96c8956aa54b3f5aa70c764b619bca7597050. 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/HKI199495113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b7724ab85e0f70841b8b0f0d40d6aa54f28b9b7f40369c8a82db15190d034b. 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/HKI199279003.
Horn Concerto No. 4 in E-flat Major, K. 495: Ii. Romance: Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4460f007003520b88774ae95011085239f3bc0b4709c2bb9536750bff2c28d52. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI190712110.
Vesperae solennes de Confessore, K. 339: V. Laudate Dominum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb152bc5ff934a16a6d7270ea907586728a1c69cb7906036cfcd2a4abb9f2cc05. 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/HKI199650113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543cf7c80e36778f3c88fde8c5e4392179515504c2e8ae098bf5b1991abc3d46. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKI199276902.
Concerto for Flute & Harp in C Major, K. 299: II. Andantino (Excerpt)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d353ac06dc2091a504a012d0f66a4967a258c9df92ea4b69ecd8815c066d99. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI199274202.
Purple Classics Presents: The String Quartet Collection
Shostakovich: String Quartets Nos. 10, 11 and 13
Mozart: String Quintets, K. 593 & K. 614
Shostakovich: String Quartets Nos. 14 and 15
String Quartet No. 14 in F-Sharp Major, Op. 142: II. Adagio -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7756b4a84f7394699a854dbb81dfa60b47828e5a2cad5cb102c22ac25a451b16. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKI199719002.
String Quartet No. 15 in E-Flat Minor, Op. 144: V. Funeral March: Adagio molto -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53be49266e362cbe17c6e426b39e06b7a09cfecf328736d1f9501433ebfffd55. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199719008.
String Quartet No. 15 in E-Flat Minor, Op. 144: VI. Epilogue: Adagio - Adagio molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4b153394233211b6f08013239c106646e785c515a3ff0d3ada727d6fa24225. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI199719009.
Shostakovich: String Quartets Nos. 2 and 12
Mozart: Clarinet Quintet, K. 581 / String Quintet, K. 515
Clarinet Quintet in A Major, K. 581: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556702d87912e4547f570361f5506ecdef5ddbf2a259906fa3fb91b0b6d2edf0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI199505701.
Shostakovich: String Quartets Nos. 3 and 5
Mozart: String Quintets, K. 406 and K. 516
Mozart: String Quartets, K. 499, 'Hoffmeister' and K. 590, 'Prussian No. 3'
Mozart: String Quintets, K. 174 and K. 515
Shostakovich: String Quartets Nos. 1, 8 and 9
Mozart: String Quartets, K. 172-173 and K. 575, 'Prussian No. 1'
Mozart: String Quartets, K. 170-171 and K. 421
Shostakovich: String Quartets Nos. 4, 6 and 7
Mozart: String Quartets, K. 136-138 and K. 465, 'Dissonance'
Mozart: String Quartets, K. 168-169 and K. 589, 'Prussian No. 2'
MOZART: String Quartets, K. 464 and K. 428
Mozart: String Quartets, K. 80, K. 155, K. 157 and K. 387
Mozart: String Quartets, K. 156, K. 158-159 and K. 458
String Quartet No. 5 in F Major, K. 158: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17208d55aa5f8998201d36f7397ceeec972e7cef1f2a8dbe2bcd39ad0294ca0d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI199278505.
Haydn : String Quartets Op.76 Nos 2 - 4 (Apex)
おやすみモーツァルト ～心地よい眠りのためのモーツァルトメドレー～