René Dupéré (born 1946) is a Canadian composer from Mont-Joli, Québec, Canada. Biography Dupéré is best known as the composer and arranger of music for contemporary circus productions by the Canadi
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 0xa7623e48c181744eaa2e8a2276aaf612da92db47d2283fd9f538409859b86d4c. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b4f0442-a5ff-4513-9312-e72a0ec3d0c9.json and https://artists.proofprofile.net/proofs/artist/3b4f0442-a5ff-4513-9312-e72a0ec3d0c9.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 0xb2500d9ab210b0343490e9a3e4e09885fe6c402e86651af7bf1e4ec2223d1103. 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/CAC609310010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e8dc55322f74f84a7cc9de32bcb20dbc104d6c0bf9410e3f124fda78ca0cd1. 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/CAC609440010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba77abcce2ed6fea10c00b0b0b6d5e2fd2759d0fdb2791719c5c96f7eb07c99c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CAC609330010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a14c01af24df068256377fb436bd4a280db1bab2ff37725c993a9426a90ec83. 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/CAC609320090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd0e2dcccbcaeeb39585d3cfe8fe2559d973df8081cb363e0ff2045f0c436cb. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CAC609450040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2599d6ad53330ad9e3851f7f3813a5a647cba72aa66dd71a57d5c37424825e5. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/CAC609310110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8307a909552a6803054c241b998c8ae2d6177ea0660831d17d1f9d0af39dbe2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CAC609330070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f2d380b8deaea22b27318084acd982067c5ff79867708a2ea63a44a476ad62. 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/CAC609450010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f2e34c0107651cc07924fcb4baeb47bf382736394f16a40a5af8d63f6a6e13. 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/CAC609440090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674ae2aadf06c5803c4f5dd7d7604a80eb3c76e496ee7bb227f01c406da110ce. 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/CAC609320140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554850f9ab4ad2eeaacee9c5fdd203b267993802795c3481cd6a880f3f390726. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CAC609320010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1b990252dbf986265c906b74dbe38d582f110022278a78e79fe18ca64cb974. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/CAC609320020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4aabc33ec5fb8f095a3be1c8a96eb93f9b80b23bab71c5bb1e0d3951b9d9f39. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CAC609320030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dad2bba76ff6021e5dd39b88526c44f39c1f3c77af8814643208b3ee2da4803. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/CAC609320040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b4d4f47f5eb11471c57013d3f2565470bf5b52a6624ead8cccab6e8bc23a20. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/CAC609320050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bfa3ea553f14ab6b46f268fc0d0d061a3eccf9a44fdb5c7ac9522bc5cc35c1. 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/CAC609320060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad17942f7ce2b3d1b8c2cd60dc9531f271b954c485f0ef6132327ec4fe786eb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CAC609320070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69caa58ae684bcf07d38edfa2b37189332e06f43b59f6d1b25add94b7728681. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/CAC609320080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cf73c51266837f73ea6f72386f68812ef94a461766d1cb1b19ab70f3e7bcea. 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/CAC609320100.