Guillaume Tranchant (; born 20 February 1980), better known by his stage name Gringe (), is a French rapper and songwriter. He is one half of the French hip hop duo Casseurs Flowters, along with Orels
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 0x80722a3a5548d0b319fd46671adb5dbb99b07f04af794ea90f32a3dc73e41f04. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/62dd6d24-dfe1-43a1-8be6-b0572b842eef.json and https://artists.proofprofile.net/proofs/artist/62dd6d24-dfe1-43a1-8be6-b0572b842eef.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 0x9c0d3075a290ae404b4edf4b55922f21780f4924dbee7e5964d8f88128ac1cf1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR6F32403150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c592cafa4ad4ed1531d2ed6083f82e2db0bcb2254e1077e27d3327ff43fb9b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR6F32403210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0feb33d12ac89d18547d1dd177e12ac2b05947c18e0c170a3e070cee81f98031. 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/FR7GM2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0feb33d12ac89d18547d1dd177e12ac2b05947c18e0c170a3e070cee81f98031. 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/FR7GM2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0feb33d12ac89d18547d1dd177e12ac2b05947c18e0c170a3e070cee81f98031. 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/FR7GM2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e4563146a922c2e3327a3a7d40a6a441f9900a2ea434ae49e338b049ce32b9. 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/FR9W12222791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e4563146a922c2e3327a3a7d40a6a441f9900a2ea434ae49e338b049ce32b9. 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/FR9W12222791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e31f5a4baf6beabdd05b45c3e7541653161df64076719ff7e74581f836da05. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR6F32102450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e31f5a4baf6beabdd05b45c3e7541653161df64076719ff7e74581f836da05. 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/FR6F32102450.