Luiz César Pereira Caldas (January 19, 1963) is a Brazilian singer, songwriter, multi-instrumentalist and music producer. He gained prominence in 1985 with the song Fricote, which contributed to the p
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 0xd20767f1b98ce56cf9ccf1f53764213d0cf30f5e4b3ef363d065a68f2fdd43ba. 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/d44b1e9b-66b6-4a8c-bd82-e01e4f0eee8b.json and https://artists.proofprofile.net/proofs/artist/d44b1e9b-66b6-4a8c-bd82-e01e4f0eee8b.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 0x59c992331f07078e9810986190e7720739830ce76b8ffef0190eb78d7177c8d9. 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/BRUM70702238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55420a729c7a5b45bec235604596cefb9d65a15164dbe772031429e7e7c53ef. 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/BRUM70500841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5db5b787098ae74004de4bb36861b9e5efcbfc7cb38e64c1e865b69bb8048e7. 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/BXB5O2000075.
Luiz Caldas e Saulo (Ao Vivo na Macaco Gordo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6233c32e4850d1fe497082ee945690f2f762af0535e33a17bb186b7302ef5c5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bf2248ffc0b3d4311180ffcc5fea52e8027a2c438ae5b7142d5cfd0714ed40. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BXB5O2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccf564e5757242f3847817b9824715976bfe7ddfaf26f4b219adbe15ef79cd1. 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/BXB5O2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96bb9366638e266229ad12dfcd846271e8801fe7bd2311dc2f4c9dc3ea94ff5f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b6474f6f3b2906899b3a35b0bf0528c2560ed5417da5f733f81391e4f61535. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b4361aac6615eedb0e9b83d1fd94e1234965755b2a5dda017c3df52ec690e3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0855a9cd3339c27a8fe2353b217f8df23de421396e3caf76427f5937e4c8d031. 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/BXB5O2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb613f64e3ce6834f849af5dd46675941eba1ba60281ce60365b85877dc5a421c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac920c02fb58de34c69b5902d17bf1dc7189f94d581af9f146a06d9ccffc6a15. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3af50909b6e57afc39f8905f42cba7287e124a3d452c64c47ebbf96924cb9b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x034c333a1c094b8488d9eec4b2235bd62501f87b8efaf0dd81662c80db6f15f3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07cccf8c18b6f4847e5f109b790fbe6e5744883c95db5e93bf4dbcd9ffcd6fb1. 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/BXB5O2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9514b70f1ee80baac47e9a7cc458f1c4f50dd39b0a5e168ea6c5a712ed525b. 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/BXB5O2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158867cd81c34639fba9c4fb99510889a849464a341531037e70df3ee0c91def. 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/BXB5O2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd42a9af5973d854455c2b1248d34c231af4a45ec714816df36f46a491a83ace. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d4efaf15e88e070560a9b44e1df312d59d8171f7c2b483f2b61b352fd2e5ae. 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/BXB5O2200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc094f613ec212414f642146da7cb62e930b7a54369776e96c40c4381e291b377. 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/BXB5O2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d4280c4aa606c88343f516d75ca1ae752901a88c6efbab75cfabed732c0627. 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/BXB5O2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e197ace33e610ef8bd11b90f747bc3f78970b5ccf75270a00e901e2f76d17d5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae73907d797a63ed5b977df88953283f8a4fb801bc801538e9454ef82be51774. 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/BXB5O2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21aa1a8159c107b5d56a2bccad96aafc617edb16490d3926dd363735ac2f16a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXB5O2200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d6b694016b2933624e33b7c54c2d001db3abd225e38a72d276e43191b2a392. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BXB5O2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f141b6aa53c85793091430037c7cd2eac37d619e2ca8e2b8682b9034876f2f4. 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/BXB5O2200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3050f6844e110d38d3ccc231cb33bf36280370876c67248f4bbb6915f40baf38. 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/BRSHN0400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1ded11b21b5c6d1f24d75e9a53242c40566a065f1adc0420d886e75b510bb8. 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/BRUM70500303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48056372c572875e5745eef83ae904958732874e69da5900f726f4881b81072a. 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/BRUM70500307.
Tarraxinha (feat. Luiz Caldas) [Ao Vivo]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f697c9ffe4d07a1a0041c4adbcbf2c7c4dc3dbfd007eef57d62f7bfef6dd8a. 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/BR0P71300016.