Maria João Alexandre Barbosa Pires (; born 23 July 1944) is a Portuguese classical pianist, widely regarded as one of the leading interpreters of the repertoire of the 18th and 19th centuries. Early
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 0x913199f2f9717f3cc093b5b3720187fe45f5381a9000a7ee7b8dc1f18528927c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec477fb1-4c21-4350-94f7-03c5212b4350.json and https://artists.proofprofile.net/proofs/artist/ec477fb1-4c21-4350-94f7-03c5212b4350.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Beethoven: Piano Concerto No. 2 & Triple Concerto (Bonus Track Version)
Schumann: Kinderszenen, Op. 15: No. 1, Von fremden Ländern und Menschen
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 0xfc635bac169a455b5c026142e02f9b82b5a42e35c6f881bab27d17bcd3ba1b30. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208400801.
Partita No. 1 in B Flat Major, BWV 825: VI. Menuet I da capo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c9c1be006b979e7feb509d9a0beb5e3f8bb7d2a8c11b67339ae61e4c713f64. 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/DEF059403678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6884e676b74a4fb031ef32944686607195c465af8c4df1b72b975bda30f32d82. 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/FRZ208400807.
Mozart: Piano Concerto No. 21 in C Major, K. 467: II. Andante (Excerpt)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d249130b24244f93e4cb1478708f26e7d10aa2539e1f99272d62b4068f321e. 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/FRZ207391007.
Piano Sonata No. 14 in C Minor, K. 457: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280f46fc3de09069de4a09c1ecc347b25ae5ac28e042bd3ccc50bcb03f5a722e. 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/DEF059002022.
Piano Sonata No. 12 in F Major, K. 332: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b1871be9052b9a8c04985ffa403ec64337ec9f66c969708757b328ee1807aa. 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/DEF059003852.
Mozart: Piano Concerto No. 12 in A Major, K. 414: III. Allegretto
Boléro - From Ravel to Fauré and Chabrier
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7f235115d719d23962db4e8057971ff4797d14d881167c967dfcba238d71b5. 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/FRZ207600403.
Schumann: Waldszenen, Op. 82: No. 3, Einsame Blumen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ca2d9608a86a93424e802473e9ee494364e105eccd7759e794f365c3d7496c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208400903.
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
Schumann: Waldszenen, Op. 82: No. 7, Vogel als Prophet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f88f76ffc285530400eff26c88c8f38cf7b5f049e107ea5349f93657f9505a0. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FRZ208400907.
Piano Sonata No. 16 in C Major, K. 545 "Sonata facile": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897b18ab7cebc6a88e0e9986b6f7fa95832b802fe57a2e05aa32651dc140f63c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058902281.