Raúl Lavié (born August 22, 1937) nickname El Negro, is an Argentine entertainer prominent in the Tango genre. Life and work Raúl Alberto Peralta was born in Álvarez, located in the Rosario Departmen
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 0x9c925de78de5119f636fc6d2587867d5f370d83e09f0d230f016f081fcca7a4e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d477a278-f206-4609-b0b1-f73d3724fe66.json and https://artists.proofprofile.net/proofs/artist/d477a278-f206-4609-b0b1-f73d3724fe66.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 0x3cc5b424323803acac111b8ec03bd48484d81dcdbb8a84962d1e6a1110b47511. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ARF860600093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54da933107c1a2c023802baaa5100fc4e75e31ca62d6e58eac24df16c7255386. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:19:30Z), 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/ARF860600100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbdb8d0f9d18f38b3f3bee476c29f5d6978661e719d508fcae8793b1ce65c8f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ARF390700498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7519d2201510332e9b2fca8709f1c1ea979db07192500a1a2f310c91e999926c. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ARF390700504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e6fbc0e281e16d2b097fef61c79d6f0cd1c949c930f79940d2d6dc3cb3efe6. 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/ARF390900734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e023da82401eb982a2e2ef84953ba43284369b35e8c796690d5fd8f7293235. 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/ARF390900735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a086db3697b348a127708b3d5f57ea8b99cf7aa5960c9065c18350c5d859ae. 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/ARF390900736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8d5906ae09ae4bb523d23d2368099945eee48448e31658bf8ec0e9846f7f21. 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/ARF390900737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6bdb8e2118daf5a874700ca985768d43c8a6bd8399fc40ff894c1ff3460dcd. 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/ARF390900739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf778463fb6197751cbb0a8740225b80f0c98fc1541898058661f9b49e26d5d70. 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/ARF390900740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafb88801b9d6f26701c87c7b808b7274bbebc51a1e64b716fcb7bb235249aca. 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/ARF390900741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240e1593acd855acf6475dcb720b244f35c6a72f314432fd748999582b67ea3d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ARF390900742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a7e1dbd760a95082052b1907e7d6e67e1ba554b47b310ef181ed12ea93c52b. 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/ARF390900745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43128b783e980f443b0bc9c4e12e880272d5acaf011f0c670dbaa605071a5805. 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/ARF390900746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c7c078435c2a2a2ff7c56110794451d6a16397f2fc2d2aabc5f3e369732e9a. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/ARF390900738.
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 0x22e8ad3a56895335b8dc510846472e7b54b34baede62446dce482f74e6b8df68. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ARF390900743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e26996d9f61a8c1b641b7715f25831840952d0025f7666b24ab34e9db52f08b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ARF390900744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1693b9490f201ed592a81eded271e80519e7d61d620e9613b51414e4dff76a48. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ARF390900747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4f3de528431b1349509b6d5ae2acb14ed34fdbc37fb6784bd27b24dae5abc5. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ARQMX1600224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf4d06c6df174b09e701ea646b28bb2695492d5c6ca758d80f1bd94ee5e0ed1. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:41:31Z), 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/ARC112500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4863ff87c0a68b4ec3d042572146e1639bae6a22160b295cfcfcd8254cf762eb. 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/ARF391401484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43558d688640fa179ddc15db761bd3908d69fc682ecc92b6403f34ee54e42b10. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ARF100200161.