Léman may refer to: Places Léman (department), a department of the First French Empire Lake Geneva, or Canton of Léman, a canton of the Helvetic Republic Schools Collège du Léman, Versoix, Swi
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 0xbcc047c9cbc8a64f91153523308f6a7294546ec22e74afb122e697860bf5d5f3. 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/da0da0f0-07bd-4ad7-a8bb-c37aa15101fc.json and https://artists.proofprofile.net/proofs/artist/da0da0f0-07bd-4ad7-a8bb-c37aa15101fc.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 0x7c2c8168eb36f26faca82d3b7c2e7b86bf1ce1ba35f0fb7ad629624dcb0a168f. 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/FR9W12363488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc770ef9299cf0163fb7f20d0f71c7d938726c54c7ece9a8a529d8f57d1a128. 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/FR9W12318905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a98c85eb4ffd862681bff69e9e48d4b2553199530c95ee7d8a0f113a0f75741. 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/FR9W12405786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b0c2af3fd0a38079247efb223b5f9a25040887552feb039e5bc6a8cd8bbaab. 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/FR9W12201237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78595510f4a258a309b6a3b6decf606b075c78ba643ee6a3b049c123c30693f6. 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/FR9W12302806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f0bf55d7a1b0f421888173024bd533893f8b1023382b1b03f8ed0008e7145f. 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/FR9W12312932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a98c85eb4ffd862681bff69e9e48d4b2553199530c95ee7d8a0f113a0f75741. 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/FR9W12405786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc770ef9299cf0163fb7f20d0f71c7d938726c54c7ece9a8a529d8f57d1a128. 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/FR9W12318905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78595510f4a258a309b6a3b6decf606b075c78ba643ee6a3b049c123c30693f6. 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/FR9W12302806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cb616dadc398ac806a9c473140e958dc82a833b4702b33d002b6d5ffbd51b4. 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/FR9W12201236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe884e6180116035acea22404393a3786a05e91b6a8d8354eb379d0e1261771f0. 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/FR1A92300203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b0c2af3fd0a38079247efb223b5f9a25040887552feb039e5bc6a8cd8bbaab. 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/FR9W12201237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3244db99acdfaeea6b1f375b92428df316782347539effd41eefb9abe41dd952. 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/FR9W12038395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31caf05f65d84dd105ded308f258832d806c5574f278886efa793186cfb23419. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QMPKX1809796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316bc7bf7129e668e60aef100f482a4e01622e8ec485987ec38fa2b38ba7925e. 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/QMPKX1809797.