SLD may refer to: Computers and technology Second-level domain, an Internet domain directly beneath the top-level domain Simple learning design 2.0, a specification used to express learning activit
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 0xa9ec6898d7763b6165bfb403e7332f7cece897ea548c88be3bae9b5e5d76136c. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/164987e8-eaa5-4a9b-bd80-ce7a29bc958f.json and https://artists.proofprofile.net/proofs/artist/164987e8-eaa5-4a9b-bd80-ce7a29bc958f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).