Carlos Leitão (born 1956) is a Canadian politician in Quebec who was elected to the National Assembly of Quebec in the 2014 election. A member of the Liberal Party of Canada, he has been an MP since
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 0x2aac2fbb566cb437e7a55b6109759b47e127af22316d6d2a361e48dac59f4738. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0daa76f3-ec6a-48c6-8c99-4df7682505b9.json and https://artists.proofprofile.net/proofs/artist/0daa76f3-ec6a-48c6-8c99-4df7682505b9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Menino Parque Mayer (Marcha vencedora da Grande Marcha de Lisboa 2023)
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 0xc2bd8c1635834818b3474b461ed82064c2c2ef4dd8cd23387fd61c35959fb114. 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/PT9HQ1900079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274287bf50c77a61bd1ff40350e7bf8d5cf803fdaf453bed9c167a03ba5aa15e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PT9HQ1900080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79ac9b7611e3e3ff9a2bd0909ab6743287cbe18a513746984f70f7ff6dd53a3. 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/PT9HQ1900083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffc473e071f909816f874b19649012d18aa04670e0f8a5be780661ac1279d16. 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/PT9HQ1900084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ebaa014e548513e629e0f6d1d419243672825b75dbd6c50934a84c5175028f9. 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/PT9HQ1900086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36182ddd24c237a7c48f627aae761d1c971b049d85402790e3c8b54699acab6. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/PT9HQ1900081.
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 0x8009d20e6eef1d50375cc1d984cef53aac913ff088d2137a2946afe1098a2160. 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/PT9HQ1900075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6fd7b5d84bf20fd43775689f3d0e85d532878bdf5cbdeab934eec07154572f. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/PT9HQ1900087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfcd88894148858829e8db8d7eb5d914c24683ac073df4d2348adf5d4ffddf65. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/PT9HQ1900077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e1578f1c6da2e72bb1f20a978ac3c4024a6866e4c6c7d031fd04764f0d028c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/PT9HQ1900078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801cdf908826245994a20551e1e116bf219c7cf951fd2c74f391d2bd251b12cd. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/PT9HQ1900082.