Sondre is a Norwegian masculine given name. The name began to become more common in the 1960s, and became roughly twelve times as popular from 1980 to 1990 before declining in popularity thereafter. A
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 0xb803333d52a97461e2e7fba2a61b7007aefad3555a8fc9591f87b9cbd6acf076. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0e3c744-5b48-4080-8bbf-181afb13b731.json and https://artists.proofprofile.net/proofs/artist/a0e3c744-5b48-4080-8bbf-181afb13b731.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).