Tren Loco is an Argentine heavy metal band formed in the suburban town of Grand Bourg, in Buenos Aires Province. Their lyrics relate social issues, like "Clase trabajadora" (Working class), "Fuera de
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 0x555dcc2e1920edf49e29f604d77f4d979d910c955da6cb2bd95bc17b48794745. 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/4c9ecaee-af8a-4302-b7aa-432ebb95a8c0.json and https://artists.proofprofile.net/proofs/artist/4c9ecaee-af8a-4302-b7aa-432ebb95a8c0.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 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 0x49ae5b8dc15de3c3763402b312516f4a8ccb93070a3b71c696309b4c987877eb. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USA561082795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc496e51dfb22013f962f8408fc9b613d27610801ff308882df1bf75a4784c63e. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USA561082796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6625f3c6fff408db4eb1ba038c45867381e18f09ce81965e51d40dddb95f1b. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/USA561082799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d1fbc8c44d3833d613dcebdf960bf3f8cb837642b2ce5d18bc1ed4d57fe21e. 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/USA561082801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818254bb18f32501caa2daebb7e9f8a993e36b619d106ff72f81c7941c556210. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USA561082804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e2b01303266a06653bc56ec39aaf527cb52e844dd30620c589d14a323a7cc7. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/USA561079089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571ad2164614dc8cc7dbbc32ffe5155dd74072adea01e936ef0464b9db1db19b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USA561079091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86639a11233af245e98f665d52a2f85423c4fe18ff905e08c12290e98e9e47cb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USA561082438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b16377f9f38f9f688fdc3d8714d5d276d51e1f5a092adf9f18e6c25df90950a. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USA561082439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740a1483e1b8949a146b9c07a0ab615d0f347ca4aa9055de1a445fb0cf2626c5. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USA561082441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4577f7f489b2eb963175c2d5efa8e7cec8dd714babd0fdd3de73431b9c5b0d. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USA561082812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4f73910b926083385f5c180d15134e7b8e97799e254af790c9a5b190a9dfd9. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/USA561082813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4873564521d816bf6296e2a706935493ae8501b9a97eac2e49e9ea7e0ffcc18. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T09:05:28Z), 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/USA561082814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935a2e3fcc0b33e9c0146eb96925503547d28bba060565457dd3fefcbdbddf46. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:55:20Z), 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/USA561082815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf9ba80af9523a7c311588fa01d675c851cb0c25201dfcea7729ae5a0f336a0. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USA561082818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e1628bb643d811375b09b462c3f97843ccec6fefffd7eaeba38c449b8464d8. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USA561082820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d36265480b9ddfe1c66bb08e8854938fbf0f43458c1c4a21ac65b7eb843295. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USA561082456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0ff13da3214f19432cc4b8ed8dc637f5e0a92c4b458132748b74c7c9037b4a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USA561082457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3003b286962572da02763917ac35f8f54a2bd27ce178aa71cd8633cbc1b24436. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USA561082458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1e8899d3a547004a15ed66aaee4f62c51be7ed771f501d66bdf2235dfd6a2c. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USA561082459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89265b3f4077deab87330e0be707e918570adc7c0887703be7e6c24e10de2469. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/TCABW1426928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42973342500e52f9a89bd9db84d63cb04d4d4463d3b3f37e534c8ae0fdbc0da. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCABW1426929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2433643eedb15bdf221bc1ed508bea1fba209b5a94bdbef17267419dd5c8b7a6. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCABW1426930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc7bec0470e79d7d3743ee5d81aaa2be1ee36276cc49e0f05f433ca03782e06. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:45:32Z), 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/TCABW1426931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c4f8d9e7abd9b7b8c557cc3ce498c4f66d1fd328fb23ddc9bb2dcb45d7ebea. 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/USA561287484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a67be64ade6e1f3bc0275c54d2f4c7e438402a8dda13749dbd39cfaa4edb58. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:06:18Z), 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/USA561287486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a4672c5a2c950f85ef63d1eef40f29b601315a42f0a8b94ad9469ec50e65b2. 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/USA561287490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec0416f2ed9cfe6789b9491e5cba12c51722a4cec9c1bda29ad8924163a73f0. 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/USA561287491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95992a7dc8ff67febac18c7eac321bc6e556c057e2a022726c0ad2f805a7d6a. Chain 2 (Bitcoin): anchored in block 957688 (2026-07-12T09:52:21Z), 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/TCABW1424206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a501b8fe76976eb46b9a78f80aba0f1e7e154fcd06f10947e545a2468afc89. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/TCABW1424207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42deb54d7b11595e7884b2e5ffd19a67b14da350ad3241d2ad5bd52758cbe66. 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/TCABW1424236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d734d4105116217a7fbb75b5b94a032be4b8422c345be9f16fc12b0e7c5d5c6. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QMDA72262625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10e6495a6d866ce3567f68c5522431bf07c20266b13b04fb2082c8f658d9617. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:41:33Z), 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/QMDA72262628.