Rubin is both a surname and a given name. Rubins is a Latvian-language name. It derives from the biblical name Reuben as a Jewish name. The choice is also influenced by the word rubin meaning "ruby,"
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 0x0fd59f9f46f10d57eeda09975e61bceb477f4fbd4c2fd144c8c7f8e1154d78b7. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8efc772b-2ed5-49bd-8e1f-e7aebd347d64.json and https://artists.proofprofile.net/proofs/artist/8efc772b-2ed5-49bd-8e1f-e7aebd347d64.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).