El Cuarteto de Nos (stylized as Cuarteto de Nos) is an Uruguayan rock band formed in 1980 in Montevideo. Over the years, due to its particular sound that mixes elements of hip hop/rap, alternative roc
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 0x9ab98a8f99d8dc9a89c6d5db2ae86c2ab06093b19b762d7610e7ef26c105800b. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2997f6e-2ce4-4154-84c0-957673e77b0d.json and https://artists.proofprofile.net/proofs/artist/c2997f6e-2ce4-4154-84c0-957673e77b0d.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 0x6b4534e374169d962f7e5bc8c7ae4a51722691f282766e5000b11f4a15ae1ab5. 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/UYB141602504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81622cbffed34fe02afc509481a1d1d3d3223bb5b4c798b2e6999454a74a23a7. 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/ARF111400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8641dcb7c88c666bd58fb9667f261eb3e5005cf98c66c1ed12398d98c2c282. 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/ARF110900970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8641dcb7c88c666bd58fb9667f261eb3e5005cf98c66c1ed12398d98c2c282. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ARF110900970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5bd8397cb8e9dcc40c19d95cef10d35b299de7ddd38de3b2e436fd159211d7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UYA131400148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7b7127ca68c09a0dd84ee3459c9579fb498c19a078760b2e5977aabd3831dc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UYA131400149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1c027d0ac55260141fdbb74a7f273ca9cc999c6c7bbf0ffae5fd924b047627. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UYA131400150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3bf5ae0cda8c179f33aab265fe8ae6ccc1224e618f53e745ab028031ab7448. 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/UYA131400151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0f21c73b468d275ba4c60aa697496833cd9c4342f8ca7ab4a5c9a388f7c7ab. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UYA131400152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f3b081bffe947c28fce37a1c489d14a5b228aaa3af6bd636ec8b555993365d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYA131400153.
Tracks para sentirse en un anime de pelea
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054a12bbb884909d6b3da59aa2f98ec1c322b1fc7129fcf0c336fed96696d99f. 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/ARF111400104.