XLC or xlc may refer to: Hypersonic XLC, a defunct roller coaster located at Kings Dominion in Doswell, Virginia xlc, the ISO 639-3 code for the Lycian language, an extinct language from the Anatol
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 0xb13f90b22b6856672e0c055652563710ca1e041bf8ea3b0fdd12f78d258df93c. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/19fcabe7-7702-4401-baf0-6aa67c92bc64.json and https://artists.proofprofile.net/proofs/artist/19fcabe7-7702-4401-baf0-6aa67c92bc64.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).