Midsummer or Midsommar ( ) is a celebration of the season of summer, taking place on or near the date of the summer solstice in the Northern Hemisphere, the longest day of the year. The name midsummer
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 0x8f5ec60c3cf6f94e0aab7c5d3dae85b36171bbe4124cd8a6a9846e90d2ac145d. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/daa2c386-c2d2-4b8f-9072-757123d444bc.json and https://artists.proofprofile.net/proofs/artist/daa2c386-c2d2-4b8f-9072-757123d444bc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).