Sergio Daniel Tiempo (born February 24, 1972) is a Venezuelan-Argentine classical pianist. Biography Born in Caracas, Venezuela, Sergio Tiempo began playing the piano at an early age. His first teach
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 0xd1e29f0cd5a62d02fb068ed9de76e94a30aa47b9d34a140ef784a6387ba7396e. 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/19e52d13-8ac4-4c67-865f-768329bc0bae.json and https://artists.proofprofile.net/proofs/artist/19e52d13-8ac4-4c67-865f-768329bc0bae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Martha Argerich presents...Sergio Tiempo
The Piano Virtuoso: Sergio Tiempo Plays Chopin, Bach, Mozart And Ginastera
Sergio Tiempo plays Liszt and Tchaikovsky
Franz Liszt : Totentanz: Paraphrase über Dies irae S.126
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb830865d0abf88c6ad7d44fb1a833bd572a2b0ae3c51a8766ae0028a29accab6. 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/BEB141103801.
Franz Liszt : Sonetto 104 del Petrarca (Agitato assai — Adagio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb338ddd83af121a202c88a88769d7c32f3d133304515eeef0e32f5a993e29d4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BEB141103803.
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
Variations Concertantes, Op. 17, MWV Q19: Variation V.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0226d52d2b49635a949f5578feed250acdf8aef8a1b6b7258dc58f23dad877d4. 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/DEN960200106.
Variations Concertantes, Op. 17, MWV Q19: Variation VIII.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe769bd692640a6f9eecc8875b5876e1a75a3bf80bc1203d684f39b1bdfca9d3. 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/DEN960200109.
Lieder ohne Worte, Op. 62 - Transcription for Cello and Piano by Alfred Piatti: VI. Allegretto grazioso (No. 30)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0024db9c3976ff42a6ca5b376e88c35eb6d243fc9e5ba5d1ad620564bd2115. 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/DEN960200097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926f065133d8bdbfee135633ff90095e0f6d613a79d3b3eda383ef77c5bd2c00. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/DEN960200094.
Variations Concertantes, Op. 17, MWV Q19: Theme
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc322df89531c158f33a76ba9db3d2aebe61c7d2ac15d2db106354b7a6fef9a. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/DEN960200101.
Variations Concertantes, Op. 17, MWV Q19: Variation IV.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0e7544c492cc4027934901c27141919393953a6b1567d1f5917d1cb0735b90. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/DEN960200105.
Variations Concertantes, Op. 17, MWV Q19: Variation VII.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e611de5bb49fe256ec18e240bb5b84bc50c08df14f9d7a804af292fba1f6d1. 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/DEN960200108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676e5979f52bdb6a3266e66d34cc1784016e866d20730bbf11e2a2237ebfd573. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEN960200095.
Lieder ohne Worte, Op. 62 - Transcription for Cello and Piano by Alfred Piatti: I. Andante espressivo (No. 25)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51eb464263c02cd32a9a18eda0e7362f99564afd24fdbb678f2846b29682e6da. 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/DEN960200096.
Schilflied, Op. 71, No. 4 (Transcr. for Cello and Piano by Mischa Maisky)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e3c50ce90c6807656de9b78c32f90b63aceffdca37194ee44b3433c5b78840. 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/DEN960200093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d17a9d4ba71a7da363c6740f9fe930e1ec7a2be78583c46514d78fe64bb3f5f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEN960200092.
Cello Sonata No. 2 in D Major, Op. 58: I. Allegro assai vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089d1b18646c7ad7c94861dad25ed0bfb97c8d502ea07243f1e5c09e67a905fa. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEN960200061.