Osmar Héctor Maderna (February 26, 1918 – April 28, 1951) was an Argentine musician, pianist, conductor, composer, and arranger. Life 1918 - 1938 He was the eighth child of the marriage between
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 0x7055456e69d8bfae9e2e9f44381183ec29b8b7207220972521ab27523ab80f88. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/06e1505e-af9f-4eec-877a-2f69f21a9a3c.json and https://artists.proofprofile.net/proofs/artist/06e1505e-af9f-4eec-877a-2f69f21a9a3c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Fantasía En Tango (Sobre Motivos De Brahms)
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 0x44ee49b9f9c594105f5d8a2d002a41dbf44fae6f79d323b2918d0046285eb781. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/ARF035800122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0957454192cf10cac99eed1a6a94eb1193be518f90cdc16329670575b59fe50. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/DEBL61230541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc8dc173a5f692669c4837f3343b03cb063679e807429ee5f3ec5f154694ac6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEKB71690418.
Antología: Colección Deluxe (Remastered)
Argentina!: Tango Legends from Gardel to Piazzolla
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9385f6f8f2a50f42cb155bd41d54172a3bdd1b4da1534e3ef5e3923d530f56. 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/FRZ333103020.