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 0xb1657e52c0a11a879ba0aae3c4c05574f8459c6b1dac35b5ca1c9f7a29cf517a. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0662ad7a-7552-4fd6-b9a1-7667b68cc1b0.json and https://artists.proofprofile.net/proofs/artist/0662ad7a-7552-4fd6-b9a1-7667b68cc1b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonate en la mineur pour arpeggione et piano: I. Allegro moderato
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 0x85b6393d02b897834e149946f5030c9c232160875c0ccdb7ea65386673c6d44c. 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/FRZ130914010.
Sonate en la mineur pour arpeggione et piano: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe81b802864220a3daa99ff11495bd08651e9745ff30364e9eb39f99a6500107. 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/FRZ130914020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3ebc24cebe999c32e1d42bfb749c6656112a7bc4620a818b6aba0ce4ae216b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ130914040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b41a0f0ce7f860733c1bc57674486ce0a30e65ef2d68a484cc4a8cf73637695. 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/FRZ130914060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8962a7ad82c79eb1fb6cdcd850bd334921ea08e8f2350ecc72402acc8c5716d. 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/FRZ130914080.
Shostakovich: Sonata for Viola and Piano - Schnittke: Concerto for Viola and Orchestra
Carmen Concert Fantasy, Op. 25: IV. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73dd0c571e8b0a26e7c91aa14708ae6169378c0c9836406998f31cbd36e10cb7. 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/HKI191020004.
Violin Concerto No. 1, Op. A-7 "Concierto español": III. Allegro molto
Orquestra Simfònica de Barcelona i Nacional de Catalunya
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52ce3176efc53d9070be0f408623133adfc08b7c08640570ed716ea2a65d4c4. 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/HKI191617308.
The Soldier's Tale Suite: II. Airs by a Stream
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8545a38a2ec21fc97635937385aff4110d02aa336721580b8a9f4f86e7d469d0. 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/HKI191517002.
Caprice basque, Op. 24: Capricho vasco (Basque Caprice), Op. 24
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fea190cb0b8663af2f3a8b9ac064e215ed3ef94e1797f64c97f12fad1e9b51. 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/HKI190548604.
Sarasate: Violin and Piano Music, Vol. 3
Sarasate: Violin and Piano Music, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643ebaf65d8fbcb8088e5e5143ad177e225715ecabbe883bb1ebc6ad90e02793. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190709808.
Sarasate: Violin and Piano Music, Vol. 1
Spanish Dances, Op. 21: Danza espanola No. 2: Habanera, Op. 21, No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc45a85d1030cfdb4f1bc4a340bed67004038883446d7cd1b18a05fb77d4974. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190548601.
Spanish Dances, Op. 23: Danza espanola No. 5: Playera, Op. 23, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518c4399b49f424f0eef2df265bdfb860f79e351481127c36c35e1e927dc649a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190548602.
Spanish Dances, Op. 21: Danza espanola No. 1: Malaguena, Op. 21, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42dfe256b34f2872ac05bee248241adb2100b5b2e6a73805975cc821612c1c37. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190548603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fea190cb0b8663af2f3a8b9ac064e215ed3ef94e1797f64c97f12fad1e9b51. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190548604.
Spanish Dances, Op. 22: Danza espanola No. 4: Jota navarra, Op. 22, No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d714d3857ae73f442548205a7d496856b753e0ec29cf9309910ffc28143b58a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190548606.
Spanish Dances, Op. 23: Danza espanola No. 6: Zapateado, Op. 23, No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b95f27e998141e5848e21a230166b851f17e45023719f0c089576f4a883e15. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190548610.
Spanish Dances, Op. 26: Danza espanola No. 7: Vito, Op. 26, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c1731d2a1504362a6c188f82a3440eae6eb0c6a9ea5ac49f0571a35939d7ef. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190548611.
Spanish Dances, Op. 22: Danza espanola No. 3: Romanza andaluza, Op. 22, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ee3f7da55cfe53adc41bbe36bca9a64fdd697876b3cafef162827cfb61754d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:57:17Z), 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/HKI190548605.
Zemlinksy, Brahms & Škroup: Trios Piano, Clarinet & Cello
Brahms: Wie Melodien zieht es mir – Selected Songs
Auf dem Wasser zu singen, Op. 72, D. 774 - Arr. for Arpeggione and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b055d9304054a14950ee3bf21db4e78c073bbf753e295227f056b37eb43571. 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/FRZ130500240.
Orlando Furioso, RV 728: II. Sol da te, mio dolce amore (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638081c5bdbcf3b2c9771b08afb2d51e018358ac966dac30d8b198c834b505e2. 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/FRX290400470.
Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716c5f8e46b7f4d3e748e3bb2e2111106632f85b692b3d4a41c022b6cd2c9a9b. 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/FRZ130500952.
Le nozze de Figaro, K. 492: Voi, che sapete che cosa e amor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98110e22aa5b8dc1ec4eef37ade406a02944cf7358fc4b46e773f2d21e110779. Chain 2 (Bitcoin): anchored in block 957056 (2026-07-07T15:15:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131030090.
Nocturne No. 2 in E-Flat Major, Op. 9, No. 2 (arr. P. Sarasate for violin and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb2cf19e6e99bd381d55747e8dd451d547580e75052d15251c55a8f923857b4. 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/HKI191145705.
Waltz No. 3 in A Minor, Op. 34, No. 2, "Valse brillante" (arr. P. de Sarasate for violin and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa928bcc54e497ec7e1adb974efb3dbba30215e743b0ff5f56d011afe9f0d5324. 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/HKI191145703.