Spyglass may refer to: People with the surname J. Elmer Spyglass (1877–1957), American singer Other uses Another term for a hand-held refracting telescope for terrestrial observation A monocular,
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 0x2951c5965fe1ea0d01e3b3fd0c4f31bef424a0597b75dfbf908e0f4ca670001c. Chain 2 (Bitcoin): anchored in block 954593 (2026-06-20T19:46:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf42b58e-1317-4cd9-a12f-acb28845da5d.json and https://artists.proofprofile.net/proofs/artist/bf42b58e-1317-4cd9-a12f-acb28845da5d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).