Le Volume Courbe (French for "The volume curve") is a band by French-born, London-based singer/songwriter/producer, Charlotte Marionneau/Charlotte Courbe. "Le Volume Courbe" was a name of a sculpture
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 0x7d47b192204206b042774d8638861f573f1051b5d6193394fd3f31a3ddafd259. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80800fed-fa13-4a62-a4c1-98dc49d4d671.json and https://artists.proofprofile.net/proofs/artist/80800fed-fa13-4a62-a4c1-98dc49d4d671.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 0xd199452819a8ff507cf3f093105751642b60294655b0afd92bdf68548b4bb3d2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GB2V81600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c00b568af5fad6a3ac51a3bf953732cb77c2004d403755db6784dd310c50e1. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T16:36:57Z), 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/QM6P41503466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0b039a4b77731e67d22abfdd8e863523ab0db4792dc629a1f337acb150d42d. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:35:11Z), 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/GB2V81500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8e22d0def3cd7dd1f704903736ed14165c0f7e43cd3686f3a1adc2220a5143. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/GB2V81500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c5c25ed501cd5b7c68f3162e436d2fa68707dca3e5107ec249cb85421e5dd4. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/GBJCJ2400041.