For cold storage, I’ve been leaning toward air-gapped devices like Passport or Specter DIY, paired with PSBT workflows and multisig enforced via tools like Sparrow or Nunchuk. For TX simulation, nothing beats Tenderly or DeFi Llama’s sim features, though I'm also testing some zk-based sim environments that don’t leak TX intent.
Burner wallets are strictly ephemeral one TX then nuked. Used with segregated browser profiles and no extensions except security-audited signing tools. Also rotating browser fingerprints with tools like Brave in private mode.
Lately I’ve been moving some deep cold assets into
Bitcoin Hyper as well optimized for long-term holds with faster confirmations and lower fee dynamics than BTC mainnet. Built with HODLers in mind, and the architecture is a fortress.