Berta Rojas (born 23 September 1966) is a Paraguayan classical guitarist. She was awarded a Latin Grammy for her album "Legado" (2022) in the category of "Best Classical Album". The same album receive
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 0x7d1ef0d0536cfcc2492ac8fac470af5a039cf82f0846dc691e1a9dd5a4bc1fc3. 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/957abebf-c7f3-4c97-9850-ccd0e6ca6120.json and https://artists.proofprofile.net/proofs/artist/957abebf-c7f3-4c97-9850-ccd0e6ca6120.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 0x0bcab00289d4575f5703a06b087713374880c227cf08cce8198d1d9a58423fb7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USY280779310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6e88d434b268b44e5282ed318bb08b27076c7580e7e017da4041f550c78700. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USY280779311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f4e7f1229e71b21a8985605764074b39dc45e75baff8848d605801925fa89d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USY280779312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d4656288435a6235fcd298d0b563b01cd8f1654c1ca7e9d8e211785c6b0df2. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USY280779321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19016d307278a27d9862cb20999fecb1c19d563c3128c6a275f7cd8f0c400e0d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USL4Q0837441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83ec5783cc4aec3252f4e339cf2f2af052c3170d177dcceeca778e9f8c3456f. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USL4Q0837442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c28ee1247e333b2e2418897cfa581c4e41dbe2222c9cafdca472d9edfc4c3dd. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USL4Q0837443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6e004847b4b6c1e097e790e983a81962e56eea3bb6fbf97432aa2a64272222. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USL4Q0837449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fea95241417a13382606cfaa4d90ce18222c3f872ea70246475ae0ff179336. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USL4Q0837450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170adab45a22abb184eee5a3f521c29b3a5beadc08a1274d93f0822bf0e90664. 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/USL4Q0837451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a22fd5906d2b85593fe76fb99e79f639c394b4adc4caf593391d57ff48d115e. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USL4Q0837452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fe924d28fe45c91a14774e32e66f13386d86568d154247c24f8bea0555e959. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USL4Q0837454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982d2de2eb288de8a3d67633747b99859c8492d69b346ddf33eef0ce1a6c8f77. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USL4Q0837457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229a6b7ca88733844aa94b30753af954123e28a7b46057b5858322e61e521741. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USL4Q0837459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256c5402d6d39a210e0500f1fc189fec7f02a1a278ffe84ef1fe72af69858c14. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USL4Q0848317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfcde92ce0ffef69fd1fdce35a4ab9626711c1749580097360d85effd440e0a6. 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/ARF102300118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ec97d5ff9b2da413ad9fd691a15424019f1c02b843d47466d529b4ca5a8244. 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/USSD12300759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52817204993f8285b8c59af50fec83a46e99865440fb5fa7d4c240b229eff2a3. 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/PYC842504656.