Helio Matheus (July 5, 1940 – February 9, 2017) was a Brazilian singer and composer. Matheus started his music career playing in nightclubs in Rio de Janeiro and São Paulo, first recording a single i
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 0x3de50cc2b018b67e809d94aa547b51e17d5a81a7829d3475ffa794ebcdda8262. 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/53892868-17ed-44ef-b001-5144ef4f9d46.json and https://artists.proofprofile.net/proofs/artist/53892868-17ed-44ef-b001-5144ef4f9d46.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 0xc7e474faf719eb3f1ca6b237ac658f3af62673206f913a52c6a89904017e5df6. 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/FRPHR1900110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbefee177a30abb7018f7fef043569c411da08cd00011b40208224ba902f15c91. 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/FRPHR1900080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd15436446bc98150fd87fd9a2117b148553cc7b549255f9005734070836caf. 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/FRPHR1900170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4102f54827dc52cb45123c0d8df196a9a49a7942c1d01ec53681555d2f4864b. 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/FRPHR1900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2ac5943e65181a10ed3fb04980dc53d6a5bed9ac139a24a4b3246665b03c7b. 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/FRPHR1900060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188a7a1e2de9b7917c07ac937a18f3b38ef470d163836a5746ef4372d8982ea0. 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/BRBMG1600265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e3415232376dbc4b386a2732e5b71e8228a0cadf1deeca225a764c98a002b4. 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/BRBMG7500184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf36b2e2f828ace93aaeb6b402c3a85437634cc880cf477a2e58470bd9362484. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:33:05Z), 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/BRBMG1600260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed29ea8293c4889e17119e0269e15c5a89ec840f8471db9b4a560e89a8db6d5f. 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/BRBMG7500182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5785501aaf93d7300d897472eb538d40226f073d12d21a6d2d568cf71a793c2. 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/BRBMG1600263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59e13fc9c534b70aa4c98a63e8df87a0d37c31ed40e07f03342253534e134c3. 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/BRBMG1904053.
Eu, Réu, Me Condeno / Feijão Com Farinha
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29cf577e426db81745dfdd327cca22b09f609a3afe24d56977451c4d458b92fe. 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/BRBMG7300118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c47eee8b979808487e1db86f752f47bfb1da7915542a7c3e353a4ef40aec04. 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/BRBMG1904051.
Elefantinho de Marfim / Caixinho de Música
20 Anos da Sicam - ao Vivo na Arena Anhembi 1980
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac49fa75f3cbb7ac16355c7e720e0ce553b64e9c57db5b8b295d7e68ad5eded. 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/BXCPT1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12dda49e3f6050a9a5350bd13367ba593550535cba845872ee185fa89354668b. 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/BXCPT1900005.