Strawberry Switchblade were a Scottish pop duo formed in Glasgow in 1981 by Rose McDowall and Jill Bryson best known for their song "Since Yesterday" from 1985, and their flamboyant clothing with bows
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 0x3e7764680f07578e034640aa531ce9c9950c81fe4c4ce23f411574802854c46c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1333e925-13ed-4aea-acff-558e1b3e9cfd.json and https://artists.proofprofile.net/proofs/artist/1333e925-13ed-4aea-acff-558e1b3e9cfd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).