Antonio Agri (May 5, 1932 – October 17, 1998) was an Argentine violinist, composer and conductor prominent in both the tango and classical music genres. Life and work Antonio Agri was born in Rosar
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 0x81b2fb6bc97412c6b189d9c6c3fe4a2b48b2ba2998b43ae9756eaaa6be487235. 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/c0a0dc29-44da-4de8-a1c1-8e50b2f9a229.json and https://artists.proofprofile.net/proofs/artist/c0a0dc29-44da-4de8-a1c1-8e50b2f9a229.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 0xd13534a014285f7f95d6b4e39d81ecf99d8089b52da7f4274335b8cb20461b34. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USSM19702281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6b0bb4c1fd57d25bea3727bc49cc084c6811bf06c5c68f8f551c6c50ca1b1e. 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/QM7282185794.
Viejo Ciego (feat. Antonio Agri & Esteban Morgado) [En Directo]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109cfe986a13dbc11741bbf2ac2e2160817a132d0b268c806d9c411071ce0c34. 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/US6R21344788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13534a014285f7f95d6b4e39d81ecf99d8089b52da7f4274335b8cb20461b34. 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/USSM19702281.
Piazzolla: Soul of the Tango (Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13534a014285f7f95d6b4e39d81ecf99d8089b52da7f4274335b8cb20461b34. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSM19702281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864e0c64f58a13a519cfc23ade6583b94d16b81730526b7c70567a530cc67d85. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USSM19702278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04dd03eeb917aa5c6a06791763d25a472d548c373c98e0d1d4a021afc9261fd. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USSM19702280.
Tres minutos con la realidad (Three Minutes with Reality)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8b174cdce4f64da82274f97023dc3bc074f56a5b43ebe73ea352c25e993088. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USSM19702273.
Charla Sobre Homero Manzi / Viejo Ciego - Con Antonio Carrizo en ¨la Vida y el Canto¨
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa182515701a3c83d177a2b02894a694d46246f68e4b7e9f7b1d0d8b55bbfab24. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US6R21504769.
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 0x75120445ffef6a5780bb315e5af011e2004d25ee85bdd8c477b02beb566e3bf1. 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/USA560306971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972923c939285587fe5dd7e3af257dc5b0fdaa8899153f9f2d84511265366a51. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/USA560306972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc13d507827d6c50877cccefcbddca2607cc0bd32e68247de41b40629f650f1. 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/USA560306973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3501cd1bc5bcb9b8f41ac5df7891ee1de8be8843f0ed2eb596671fd0ed668593. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USA560306974.