thumb|left Pietro Spada (29 July 1935 – 31 December 2022) was an Italian pianist and musicologist. He was particularly noted for his technically masterful and vivid interpretations of works by lesser-
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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 0x91420cf0b76c325dfd9ed6ddacf8f9447c1af0dbb8aa3dab25e02d1480b0fa1a. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2bfb5450-bc3b-4a5a-89f2-bf9b904612d3.json and https://artists.proofprofile.net/proofs/artist/2bfb5450-bc3b-4a5a-89f2-bf9b904612d3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Clementi: Sonate, Duetti & Capricci - Vol. 4
Clementi: Sonate, Duetti & Capricci - Vol. 3
Liszt: Weihnachtsbaum / Bartók: Roumanian Christmas Carols
Schumann: Carnaval Op. 9 - Kreisleriana Op. 16
Clementi: Sonate, Duetti & Capricci - Vol. 6
Clementi: Sonate, Duetti & Capricci - Vol. 10
Donizetti: Complete Piano Music - Vol. 1
Clementi: Sonate, Duetti & Capricci - Vol. 8
Donizetti: Complete Piano Music - Vol. 2
Clementi: Sonate, Duetti & Capricci - Vol. 11
Clementi: Sonate, Duetti & Capricci - Vol. 12
Busoni / Bach: Complete Transcriptions For Piano Vol. 1
Donizetti: Complete Piano Music - Vol. 3
Clementi: Sonate, Duetti & Capricci - Vol. 9
Busoni / Bach: Complete Transcriptions for Piano Vol. 2
Clementi: Sonate, Duetti & Capricci - Vol. 15
Clementi: Sonate, Duetti & Capricci - Vol. 13
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 0x5bcbcd3cdfe967a3cc5ff9dd3682587aaa0f6114355cf94f4e83d8ab33502e69. 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/GBUM70801681.
Piano Concerto in C (1773): 1. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eea6057e64b14d769f16207e04d00468b8defd78d9d77c98b64c9ef38d9726f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBUM70801682.
Piano Concerto in C (1773): 2. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172e4363616705013577248628bd2ee2406f7403c0fbe2fb9067a72ed7b88791. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBUM70801684.
Piano Concerto in C (1773): 3. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d0fdb5f021b03bf8a9e4b27d310080c4a024c16b26bcf90579e9a6a1242047. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/GBUM70801685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c712930f3d07ac534a9543900b3e451a7a302ad2781c297aff054f138d20f5. 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/GBUM70801686.
Piano Concerto in B flat (1773): 1. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1805a9a515fb4ad8b59166e1bcd413064e5566a75203a0265386f6f044f23f8c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70801687.
Piano Concerto in B flat (1773): 2. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf647568a6996b60c4815ffacb2f944e3394023bea4f25ccc73d62e3d36ae7cf4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBUM70801689.
Piano Concerto in B flat (1773): 3. Tempo di Minuetto. Piu mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ec09469ab76c7a1c93a5bb40d97b8a8caf9e15746dc4989e3e95b02c2a84bd. 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/GBUM70801690.
26 Variations on "La Follia di Spagna" (1815): Theme (Andante)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b19f08019b2c6095d1177851a5b9899d1804d076e3641195083cc88b55e013b. 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/GBUM70801691.
26 Variations on "La Follia di Spagna" (1815): Variation 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea550883842b8d66c6f7ea810d645742fda1e1dc8cc8d7735a31fa53ccedf41. 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/GBUM70801693.
26 Variations on "La Follia di Spagna" (1815): Variation 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9be385d37d953f89bb26ad3e10c21595492993460b5f7c63955f1723391a0a. 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/GBUM70801694.
26 Variations on "La Follia di Spagna" (1815): Variation 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4236cf4ef131cb009082cc9e3d0415c98695dd4d73432ba4d678f92b1166f744. 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/GBUM70801695.
26 Variations on "La Follia di Spagna" (1815): Variation 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e3a938275851021da6b57db0b0c537394913bb4b425e4e69b8b7f250db27a5. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/GBUM70801697.
26 Variations on "La Follia di Spagna" (1815): Variation 6 (Andante)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8620cb0d0893895634aeb2ca85a6196ba422a1a455617a4040310c645938b49. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/GBUM70801699.
26 Variations on "La Follia di Spagna" (1815): Variation 8 (Poco adagio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189deab4e0d3e0e955259ff60b49460eb39356a5e00cefc55a3ebf0ebc407dda. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70801702.
26 Variations on "La Follia di Spagna" (1815): Variation 9 (Lo stesso tempo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68133e153aaa22ad9204cf67dd787d894e808a861c4b371e6abb3fb9b02e04fd. 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/GBUM70801704.
26 Variations on "La Follia di Spagna" (1815): Variation 10
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c9ca23d6a4611d134120e6be01d5ae3430556bd2d6840b55fb1770fa94d854. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70801705.