Antoine Dufour (born February 18, 1980, in L'Épiphanie, Quebec) is a Canadian acoustic guitarist and composer currently signed to CandyRat Records. Dufour started playing guitar at the age of fifteen
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 0x1885cc05dc63644cbeef62b75d3927244aec3e8ca77baf547de314e7a43771bd. 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/78b432cd-adae-4701-a4b6-5d085ac9b534.json and https://artists.proofprofile.net/proofs/artist/78b432cd-adae-4701-a4b6-5d085ac9b534.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeff6a57d5705ae7be41ca95e150a0d11bb70af154edaefe35f1a99937d75de6. 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/CAC9I2011001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1d91cb54b88680a7aa911ba80bc29169641ea4495c78b70ab80076bb0c9511. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/CAC9I2011002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbcacebed7ee183576fd990bd81f5323bca933f3e8bc8df6c2e112d57926346b. Chain 2 (Bitcoin): anchored in block 958042 (2026-07-14T18:24:07Z), 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/CAC9I2011003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc920689a58ceba5ab9d5838fb0c34d925b3890c0311153eefce610326b0bc3. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/CAC9I2011005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5b37075d5bad52fa83685e4bf63d063a0f848a83938244aed590eb239151e8. 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/CAC9I2011007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32bbd9a8b38ae2b69a89f9f3d3a8ab308f03c6bbffdabbf07c1871475001bdc8. 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/CAC9I2011009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2402e31a47d4897adf78826bd3e65edb537a21626487612212a296c4f730c6a7. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/CAC9I2011010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec58a66ae99b75f067d456928a3001cf55be345307d4e444355ad1e74fee0a34. 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/CAC9I2011012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5c3e1b9df2d310b4465bb0ae2abd82e08566656e4aaac9677b61fc69493b52. 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/CAC9I2011004.
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 0x620680f7b099814a89ae0a47262a3044317c53b1bfa592e78e92acafffc99823. 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/CAC9I2011006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456ae5b9f047e21782c906f9348cd4be5fa693dc0583e5206f94c5d755b4566b. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/CAC9I2011008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff278f6b7d6d1020ccc57c9389b6f4a8834a4f44986250f4250830dfd1f46b2. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CAC9I2011011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62a95c1e9ad20496479b5d8fcfe734096f0dcbd0df2c57925f6346f7844e6c7. 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/CAC9I2201022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1bd5d320abb6bfb27f0556889242e4d67f3681fe25858e1db5dce5cf0bf98a. 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/QZNWV2379924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f5dd651fb082075518b5f6b95a59686fe21079218c1bf00e4736b596579e27. 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/QM4TW2026880.