Pablo Barragán (born 1987) is a Spanish clarinetist. He began his career as a member of the West–Eastern Divan Orchestra, and then made an international career as a soloist, especially as a chamber mu
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 0x3b0191a648d596e3302cde1d7779b41f9d704af22cc9b46122d34643bda7b3dc. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7410390c-42ef-4518-826c-64617613b045.json and https://artists.proofprofile.net/proofs/artist/7410390c-42ef-4518-826c-64617613b045.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Trio for Clarinet, Violin & Piano: III. Nigun
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 0xbbd914781ac45f2ea68861c84ef7333223530ef88d2b64046e16180d857a0660. 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/DERK62464303.
Trio for Clarinet, Violin & Piano: IV. Kozatske
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ea94431e925ff5ccb15d594bf93c29bce3ae38508c9d54cb0532cdd5282312. 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/DERK62464304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07536fb7ca2a0556da4c9731a73ed01b159b80866fe4f9a2247a78b8d2f50c5. 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/DERK62464305.
Nature Boy (Arr. for Clarinet, Violin, Cello & Piano by Frank Dupree)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb8052e111cd7f19bd790ffb5c07c83112ff5c9ea6353d25fb90ccc0aacdea0. 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/DERK62464310.
Greetings from the Balkan (Arr. for Clarinet, Violin, Cello & Piano by Frank Dupree)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf720a434ebe6db2daafcf683779891fb83155a2c8161044399dd5c34518bea. 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/DERK62464311.
Trio for Clarinet, Violin & Piano: I. Freylakh
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f666e9ce61794afc7ebfa0e6e272c94d1866e47cb9b52c4541b31c2604ce0d. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DERK62464301.
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
Trio for Clarinet, Violin & Piano: II. March
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe22afe962f4e6e876b649c4e6b08e3bc47bea9630d95fdeaa70136eb68517e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DERK62464302.
Poulenc, Bernstein, Weinberg, Prokofiev: Boundless
Brahms: Complete Clarinet Sonatas & Trio
Clarinet Sonata in F Minor, Op. 120 No. 1: II. Andante un poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662ab90a7c2948225916014c8852ccaef9026863b0bfb9cf57bd6d1113191f9e. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/ES59G1820802.
Clarinet Sonata in F Minor, Op. 120 No. 1: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedebe0e3ac67d33d6f0d028e898df72eec6a9d378b2c36bb9fa6574ef1577cd4. 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/ES59G1820804.
Clarinet Sonata in F Minor, Op. 120 No. 1: I. Allegro appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c616777db0456b410253b385d0b9218e3b9eb59d030d6bfd9fe6c65f3c60a5e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES59G1820801.
Clarinet Sonata in F Minor, Op. 120 No. 1: III. Allegretto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26489efed0ea369a6b6ebbe93b6e1a4fd24bbee14e3fc213990776b3a3367e82. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/ES59G1820803.
Clarinet Sonata in E-Flat Major, Op. 120 No. 2: I. Allegro amabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a5fa88d5db2d36f0a839f006fe55c40ee369c145f591d4f5c7ba338508d37d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES59G1820805.
Clarinet Sonata in E-Flat Major, Op. 120 No. 2: II. Allegro appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363225c41f59f0628f36973a1cabe6ea3bbfad1025f962c5b48fae3f7dd863b9. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES59G1820806.
Clarinet Sonata in E-Flat Major, Op. 120 No. 2: III. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bcb51e58eafa7b9e9ac9d0ee78a34284e63221ef37dfc6cff86c291cc1563ed. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES59G1820807.
Clarinet Trio in A Minor, Op. 114: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6b1e0a559b1eb2b178b2a1d37fcceecf69a2059a9852f0536c683972db45a5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES59G1820808.
Clarinet Trio in A Minor, Op. 114: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e40e2b6a2a4d284bba55e1ff4d51784410ff8bb982974cf84797ed1276b5d58. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/ES59G1820809.
Clarinet Trio in A Minor, Op. 114: III. Andantino grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04750d42c75f5079180dece162dbe763b33e78e8fd1c016eac4bbb961afadb07. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES59G1820810.
Clarinet Trio in A Minor, Op. 114: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86552468754f85278e3e966de442c9ee78573b3fb9a140a7516d6469cccd537. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES59G1820811.
Weinberg: Sonata for Clarinet and Piano, Op. 28: II. Allegretto