The Sexteto Tango was a tango musical ensemble founded in 1968 by a group of musicians from Osvaldo Pugliese's orchestra. The group had a long career until it disbanded in 1991. Origin When Maestro
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 0x912dff3f46ba4a8d4a8c727af58ca86d43396c24db9e5a6b55500c2f82621d6e. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e02fa3de-3322-46fa-a37b-17cdfd52754e.json and https://artists.proofprofile.net/proofs/artist/e02fa3de-3322-46fa-a37b-17cdfd52754e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Recital Para El Mundo - Serie Argentinisima
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 0xed7aafa46522a874a7d8736a9cc18e8e29b2342ecb807157ecd05395c55773bc. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ARF070700157.
Vinyl Replica: Presentación Del Sexteto Tango
Sexteto Tango Live at Teatro Colón, 1972
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a351cd1241fcd164f4d1ed45259d3b08a05267d5eafa004c7d1975d03fcfd6a. 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/ARF038400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637d7c1b5dcd374f268138de16663d1384ca9fb51ed8aa826c70d55f70bec284. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/ARF039900495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a351cd1241fcd164f4d1ed45259d3b08a05267d5eafa004c7d1975d03fcfd6a. 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/ARF038400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f989fa77babe2a6b64880fc1a8adddaae004f73a434e67eefc5f72e9fbb5eb. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ARF038400125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ef48f76c9dab80a62ebedb235e7e0998721335f49560bf7c462192142a56fe. 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/ARF038300066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c206f6eb70f233bf1370f25199d2ae5ac7f14c992364b273dcaa0ed43f0734. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ARF038400089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495ccf6da8429fdde4d4ff8d07fd70de0973cf08610db9c83fbac11bdd3e72a8. 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/ARF038400127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc797e918680b6e44dc2c8b691aeeb69051a9afb05f38c095e1b8bcb7ce33a1c. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/ARF038400122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb294d2f3beb832c148b32c73c88534cd8a0bdf7d43c89ba0540dcd2679354784. 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/ARF038400123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd3bd7be36227c54c9247b9449b88743dbe9bff55732aa5a84b0f0518e9d095. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/ARF038400124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8262e297ecf77617bde19586fc640dc83447f96b08f8ca0a78aaa5294eb9cd21. 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/ARF038400126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1459457e68c3c3ac7df4955eaaade1bd88061c5d17a99ef806aa1dee492d663. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ARF038400128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc218ee335aadc6ecaec49308c743b5e4707eacfaf04d93d645050148eb1743c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ARF038300065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a351cd1241fcd164f4d1ed45259d3b08a05267d5eafa004c7d1975d03fcfd6a. 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/ARF038400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637d7c1b5dcd374f268138de16663d1384ca9fb51ed8aa826c70d55f70bec284. 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/ARF039900495.