Ana Maria Carvalho is a Brazilian sociolinguist and a professor of linguistics within the Department of Spanish and Portuguese at the University of Arizona. She is the author of several books and art
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 0xb796f2abd7bfb9e91084ea30b8608e3aff437e69dcd4b8a40e86a530a75a02fe. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/10169974-17f0-46f7-b377-c46e43f1a0b4.json and https://artists.proofprofile.net/proofs/artist/10169974-17f0-46f7-b377-c46e43f1a0b4.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 0xb725aafd013605b365725105f8b71c492c2db9c091f45a3932b66a342f81a02c. 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/BCLD52200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6df7c5b2fcdcbd27a46b0bc258c2e3851b86f26417ab8b5e224768e212eb8b. 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/BCLD52200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f278dc3e7b91a65f696e97d50cef7e52f58ad21d05443cfd9db44072a19892. 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/BCLD52200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc8e7411fa759661f4bc2d8e1c3dd25a553bc6370cf1161b5ef5e75477325cb. 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/BCLD52200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bbf82eebd8275fad86ea5e33b31028f042e566bb07cbef5a6f528763926cd9. 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/BCLD52200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7291bd195b231134739cbd96efce3715380c569d761a118e025463d9da24168. 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/BCLD52200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488b65238c06165d2964e2cb86cd914d844f106841860c6f281df594d175a334. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/BCLD52200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cde9dd3bdf82028caf30816dfb393706691c042bfa15fee54f67960e37a21a4. 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/BCLD52200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408dc756304cfe9daa794f563be307c2205131498f673a8b33d3e191c5a0a483. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/BCLD52200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3e0f370ebb798fea18883ef4bdad2fe144eb1fa7633ca53507949e8a5bba9c. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/BCLD52200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850ed6225f071d52b3a6553def02797d11fd4fa4441a0d21e10c089549ae01f8. 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/BRPOU1100082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d2f449b8b4e058fb08b8f0be6e058bb5396244ce1b88699215b196afe1c813. 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/BRPOU1100083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97424fcef99c1a54fb12cd1a4b8cf59a125e2f1a006dd8e7275922a9040f22c3. 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/BRPOU1100086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55fde9412e2fb3248f9194062040a994cb7729948d7304a735b90204a5d7db63. 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/BRPOU1100087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c16bbc59c090905a5fe41c647df1fdf06fb5c6126bfd10b2d87942792e14890. 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/BRPOU1100092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ca486ccfbe6d5635eb444d41f7f001a04c76701c98ca74085c75e4389baec4. 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/BRPOU1100093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b96bbb4549b891bbc1386d839b0c741a79cd8b5e1abffc554d60b1ba767713a. 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/BRPOU1100094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39a5f4304c8a4d97f9e6348a0ce199116ba2ac412df4aed0db6251a492bda3c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BRPOU1100084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02be84613005b7faf0a0aa61bde422741fd6c2c794dd1ace16957304b2a1771. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/BRPOU1100085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095625be2177422a9d38d08942db544cb8e1c610fa76db0c24b9cee544b74602. 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/BRPOU1100088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa585e8f5fc45bce4e93462e5ae4ec6c12aa3ec7b7094038e3b58ab0e75464b4c. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/BRPOU1100089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd201a2272a7c1bdb405bb539f930c0492efbb968f3bd1b198a34ee029ec89367. 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/BRPOU1100090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a4c759faeec27f63b8c19e0f998226ef484a47ed7d10cfb7e3306a8c566875. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BRPOU1100091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bbf82eebd8275fad86ea5e33b31028f042e566bb07cbef5a6f528763926cd9. 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/BCLD52200009.