Aldo Baldin (January 1, 1945 - January 5, 1994) was a Brazilian classical tenor, known for his interpretations of music by Johann Sebastian Bach. He performed internationally and made many recordings.
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 0x70f7d50373df293ae32de58858ca47baf8670bf75c90106f7837d2d5751ac061. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e0f1ff0-f961-4a56-99d7-546bffa3babf.json and https://artists.proofprofile.net/proofs/artist/4e0f1ff0-f961-4a56-99d7-546bffa3babf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x122c150a934bd0057dd08ff3329630ef7257a90b04b8491578171d6494342cdf. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NLA508400101.
Le nozze di Figaro, K.492 / Act 1: "Se vuol ballare" - "Ed aspettaste il giorno"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c7f70a3b8d7e8000a03b75cfbf863db846cbd170e12bc4f5f46d79465e5a6e. 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/NLA508400104.
Le nozze di Figaro, K.492 / Act 1: "La vendetta" - "Tutto ancor non ho perso"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f355ef366aec0be41f2379487cefb2f377bd06c77767446b24efe639d7ea38. 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/NLA508400105.
Le nozze di Figaro, K.492 / Act 1: "Via resti servita" - "Va là, vecchia pedante"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999ce681dd5dd872707e31c0ea150a6fe2d4b06070fe4628bb189794c6472d95. 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/NLA508400106.
Le nozze di Figaro, K.492 / Act 1: "Cosa sento! tosto andate" - "Basilio, in traccia tosto"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb46ffe1ea568954341855abbcf1d21ec0b7f36191ccb60c9bc0788e882f0ca. 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/NLA508400109.
Le nozze di Figaro, K.492 / Act 1: "Giovani liete" - "Cos'è questa commedia?" - "Giovani liete" - "Evviva!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f40aab63f037a273f23f62d158e1be924b36f6c37f28f70aee369452a453840. 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/NLA508400110.
Le nozze di Figaro, K.492 / Act 2: "Porgi amor"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe0c6cd4180ab87c88a6b76fd2cfdf2671282e0fe37772b9f174ba368bd345f. 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/NLA508400112.
Le nozze di Figaro, K.492 / Act 2: "Vieni, cara Susanna" - "Quanto duolmi, Susanna"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489c1be9fc93649077d9eae1bb17253af53154613f8eae06be9fe64c945a7caa. 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/NLA508400113.
Le nozze di Figaro, K.492 / Act 2: "Signore, di fuori" - "Ah! signore... signor!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954e5d346fa7ede0f4cd18f8fd007ddbcbbd6a7d6618874de6123d6a244edc6e. 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/NLA508400121.
Le nozze di Figaro, K.492 / Act 1: "Ah, son perduto!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982e8a281a3db23b5b778749af3292dd3674710156e7a011de9a876a84d3bded. 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/NLA508400108.
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
Le nozze di Figaro, K.492 / Act 2: "Voi signor, che giusto siete"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba2eb161f4b9b73a3ec5f4518b051b68b8ff9fbedf159c8e25cba57dae80195. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLA508400122.
Le nozze di Figaro, K.492 / Act 4: "Gente, gente, all'armi"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248fc93e683a167a1999c9e1fb6c08a1fbfb2e26d4d88ef6e099dea6017e966e. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLA508400145.
Ein feste Burg ist unser Gott, Cantata, BWV 80: I. Chor "Ein feste Burg ist unser Gott"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d892182684e4674f3883abafc6e0b21e0ba48de3230661d7f7ef25aa0c07e1. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/NLA507918708.
Ein feste Burg ist unser Gott, Cantata, BWV 80: II. Arie "Mit unsrer Macht ist nichts getan"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b464bcbdddd75cada6a25371de05cccbee2d204f179cd2c3fa8332616ab1c3. 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/NLA507918709.
Ein feste Burg ist unser Gott, Cantata, BWV 80: VIII. Choral "Das Wort sie sollen lassen stahn"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd918f29cfce1f11b2f2705b4e50d896784aecd47b48fe86bf36f6a5a5ca0c966. 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/NLA507918715.
Heitor Villa - Lobos Serestas, Bachianas & Canções (1887-1987)
Haydn: Missa Sanctae Caeciliae, Hob. XXII:5
Mozart: Le nozze di Figaro, K.492 - Original version, Vienna 1786 - Act 4: "Contessa, perdono ... Ah tutti contenti"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897c57868fc0a8bcbb7fbec790d987b045ada12c31accabcfe4706834f472c14. 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/NLA508400179.
Wolfgang Amadeus Mozart: Schatten ung licht: Chapter 2: Salzburgs Glanz und Wolfgangs Gloria (1765-1769)
Südwestdeutsches Kammerorchester Pforzheim
Carl Philipp Emanuel Bach Chamber Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffd144f0024c8fb524119b09ff493b81cebf3614558c5abb8a99dc3ab590847. 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/DELW71490602.