thumb|Sylvain Séguin (foreground) and Sébastien Séguin of Les Dales Hawerchuk performing at Les Francofolies in Montreal, 15 June 2025. Les Dales Hawerchuk are an alternative rock bandLe groupe Les Da
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 0x01302d1b4ccc034bd50c5cbd48d3e4312ef52589b78aa7a5b055e4a992545d8c. 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/26989129-8307-4a4a-8343-45673baad5ef.json and https://artists.proofprofile.net/proofs/artist/26989129-8307-4a4a-8343-45673baad5ef.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 0x3d7237bfc37cbac71d533c9113bc4dd46fc3ac896a28c7445d54140d54dc8eb8. 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/CAP781100401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6830e338ef75c9b15b6c55504899c55a45f3e91aa8987190944103f32d48d014. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:53:30Z), 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/CAP780800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe633a4364a194e3e4ac4a556953fa55e6da6784a53ea4dc301628f147813d7c. 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/CAP780800104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55fb8f8b1e35780561c0c7bc46abcae918cc856c3048a64954793c73fd472dee. 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/CAP780800105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe95db9e0ee2611b19450b68015f5b76796c808d5a7e07e4886f78ae85d78a4. 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/CAP780500101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0509e26b3317f89b5f66636a6fdcbfe3d86db07738dba9526e1b1f75d085cc0. 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/CAP780500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511af16e8a382f51e197ca383647a7cf4477c299fcc06df94daf57ad093ec696. 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/CAP780500106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9adfebda8712190d31d530f5760df0b9479016468dcaa4d3b7b2ee845fd17a. 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/CAP780500107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88daf31c533b72427baeee423b2cd0c50d6eeeb6659373634546bd8143f24cdd. 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/CAP780500110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b6b34ac5f665586279c8b85b933f63089ad2878fffcda63b8985b976487bba. 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/CAC6N1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa3d3d80d3168aaa95adb6ba7df415ee6fc246f7862b3318b9e3afc8e3a9cf9. 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/CAD432404702.
Y'a rien d'impossible dans une chanson country
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd234a8f7bc2764da8b0695571b49409b8d08956ef581c5d51e600846bce213. 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/CAD432404705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20a6a61a87807c9facbabbafb1f08f5f41a86567206acd1cd5f2a25425cd5aa. 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/CAD432404708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6f67fc42964e09908a6b0cf4c145e2925944c87918075f5de79c0083987450. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CAD432404709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77bb9acc9b55288c1e25d18b4a9125bdac4f84c14d771cd0836f4a5fa92e4b1. 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/CAL541718001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f76e94b5979a004baf8d295ccd3687d03927a8c5d127cdcb227071ec41e0301. 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/CAL541718004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf831c566103e7087c2153bc7722f93bd766784771ba16e2c6367f7a23c0ac850. 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/CAL541718011.