Negre or Nègre is the surname of: Ademar lo Negre (fl. 1210-1219), troubadour from Languedoc Jacques-Étienne Marconis de Nègre (1795-1868), French writer and active freemason. Charles Nègre (1820–188
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 0xbc2c4fd7860880a0bfc035b5fcfb7d7b4fa58869ae6ee3ace6e69a8180bccbbf. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb56daaa-b1c5-4305-995f-ebe4b9adfa72.json and https://artists.proofprofile.net/proofs/artist/eb56daaa-b1c5-4305-995f-ebe4b9adfa72.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 0x75a1c7d984188415ca5c247b0823d84d96740bfb1d075d89eac4673973bffca8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWQ2340266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab291017bc968942e4a9655956209cd6b1f772f5cbbbb842980aec4f17acb9cd. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T19:03:58Z), 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/QZWFL2340769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb410cd986903a050ddd08a71ff0326b09368f7b969a0fc5580cb4ad5cebf6452. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:32:53Z), 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/ES80A2522204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9c75d5025c641d21b92ce552c73d6a000e09e3e67b4121ddce2dbb13ca40a0. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/ES80A2522201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fa285e6ab983ec86b0723a319a2046234b4395c5d24117f6412b7f0c83abe4. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T18:10:35Z), 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/ES80A2522202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986d54a2c6301fe3fb918c62667088eb42c82d55f13681307c759dd7f17098b1. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/ES80A2522203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884fe31a65dfeb5ac073d93550f0279fb0f14a643167c796ed5536c90dc1dc8b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES80A2522206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fad8cff56d21e0ab4ef34ae7c679d2d2f603f111fe9fa56120f578b203074d3. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/ES80A2522207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8730bc568b37d966d494887efde98592f329e676b5a377574e33ee04b3a30a2. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:09:26Z), 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/ES80A2522208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde572a19c7c3c4240cd63cde8d9b365eeef91e6838328b28e99daf3c91b499e3. 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/ES80A2522209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca593fc30a0553f0d637f41641849f0bb8ed3edd32e68dc049b5b54bbae95f8. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:20:57Z), 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/ES80A2522210.