Matheus Leonardo Sales Cardoso (born 11 February 1998), commonly known as Matheusinho, is a Brazilian professional footballer who plays as an attacking midfielder or winger for Série B club Ceará, on
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 0x26e75a32dcae8305aee402e99652282da3f3460d5e52eca4cdb3f245a7a97777. 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/d21e2dd3-23ad-4082-acd9-953bdf86d1cc.json and https://artists.proofprofile.net/proofs/artist/d21e2dd3-23ad-4082-acd9-953bdf86d1cc.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 0x090a840619bae366c4af2cd9070d9eaa8b80c3a924b6389556b5cd3ea8b8b5c9. 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/QZNJX2264415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d18c229ee41b6d0ee8effc9dd64afe125d2e21b44a82fd6c6b26ca4c0fe412. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZNJZ2361633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c581b1611a31015af9494e9aa11bd7d0b38891cac9128e2d8f35c639f8e87ac. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNJZ2361634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2646951b47892c6aec6aafb7c079f67a4a84788191f7a4abd2f9a2c8eaa8623. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZNJZ2361635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf44212b42c61df63b11746c9758dc6a3c44e7037ff00dc536c100aab5c87ca. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNJZ2361636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde244da6305d4fe137fa6f118ce67f3d58051a64e3ba0e352a3c781067cad0cc. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZNJZ2361637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0deac73678523ff4a80ddc0f0b9897f445521b5f9ef9e661dc54ecdceec225fd. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNJZ2361638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb664be0486b1acab034b3919da4f2211baa1971fdd8b9e4ed9abd61a46bd1b12. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/US7VG2408540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbeb21ec6529368829492e868a13fa5f8dfc23746510297850ff04da873d26f. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/US7VG2408541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5d77352fe22abd3c41fc7ad06d014755a1370b0860e4014a1b302e9ddf5511. 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/BXSSW2300994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8c45cde9ebfa093b06979ca6346cbccbe6e0923a75e36d8a138ae1f7212841. 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/BXSSW2300995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97add3cdb8e5499c2847a98c659caba865cef968c980ba874390a44af1d9f91d. 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/BXSSW2300996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51a5752aa1582082093ca2e0a05e66abf7e22e20e9468763dff0834b02be016. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/BXSSW2300997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0740705df1e83033b483d2d26574d4b9e88bf9a347126887390ab944e8b515e. 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/BXSSW2300998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe0cf847ccaf1a99cd5a6734f71580af2ca32fe1685e2923260efed798727b3. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BXSSW2300999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f9a72ecbbcd2f461c818168c4e8b3449fd21efed3decf3619ec7ee0e33b7a3. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/BXSSW2301001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fcbd1ada0c2bb921d80c5a1a869590e9ee26f9bf339289439fba8436e54c99. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BXSSW2301002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd07c3bb88da281c34cf98c06475aab1d3768725935394b6069326ae414486f5. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/BXSSW2301003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7953128574b868511d135cfca19377e622da24fae0fa7934c7a86707379af7ed. 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/BXSSW2301004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406e32ea730a8a3c7794178c918a70b59dc5dac7c9c6ad71a550dc5e5b02131c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BXSSW2301005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfe1bc0bf4cee2a025d611a1f54707e45fe7a44e8f91e66f87c99cb73e48017. 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/QZNJV2425464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bda24a2fe7063d0cc1bf34392ee83c95eae35503ba495a1c978d7213898fcb3. 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/BX85Z2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa58e294bdc134890b9ae7672e2709236a472cfd91fc2fb354fa8bec7a15d2b. 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/BXKG22400985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7bdb728d8a8ba49c71d4a4c9e9e1f43d54d0f053c71e22d854f800f2acde45. 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/BCHY22300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06b28823ebcf7aa7f3fdb2b9a1ed6ee1be49cba0c655fbcb1d0b5178ec5d1b6. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/BR9Z22400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9c09cef06d28ea660eb5d3984203042460731461ecd0b3de141777d9d48c79. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZNJZ2413188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8d12b67e081dd5ebcb202f073154e1d49bc5ee76b0fe9fccf2776b3af5dd74. 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/BC1WJ2500008.