ls is a shell command for listing files including special files such as directories. Originally developed for Unix and later codified by POSIX and Single UNIX Specification, it is supported in many o
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 0xa93ffb6d7701e1e8e873d90178c3ca74c8a5cc01e21f228d01f2103593446376. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc44ded0-c48c-42ee-91b9-44ab4f2fdfbe.json and https://artists.proofprofile.net/proofs/artist/dc44ded0-c48c-42ee-91b9-44ab4f2fdfbe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).