Cold Summer may refer to: Cold Summer (Mustard album), 2016 Cold Summer (U.S.D.A. album), 2007 "Cold Summer" (song), by Fuel, 2014 "Cold Summer", a song by Adonxs from Age of Adonxs, 2022 A Cold Summ
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 0x182c648a9a218c8b44738adc70c88c5aa1f1f83c927b55bcc98edbe3b825a28a. 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/ddd9346a-314f-454b-a977-74e409b74aae.json and https://artists.proofprofile.net/proofs/artist/ddd9346a-314f-454b-a977-74e409b74aae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).