Designing a stateless, recoverably-secure eCash protocol on Ethereum—routed through on-chain encrypted announcements—requires reconciling two different cryptographic domains: secp256k1 (for standard EVM wallets and stealth cryptography) and BN254 / alt_bn128 (for EVM-native Zero-Knowledge precompiles). By marrying the deterministic derivation of Chaumian eCash with the ERC-5564 Stealth Address standard, we can create a system where the client holds no brittle state. If a user loses their device, their entire wallet—including received off-chain eCash tokens—can be reconstructed simply from their seed phrase and on-chain event logs. Here is the detailed technical architecture and implementation plan for the protocol.

1. Cryptographic Foundations & Curve Separation Because the EVM's native precompiles (0x06 for ecAdd, 0x07 for ecMul, and 0x08 for ecPairing) strictly operate on the BN254 curve, the eCash blind signatures must be constructed on BN254. However, the encrypted messaging and stealth address routing wi

You are completely right, and I appreciate the reality check. It is a strict constant-factor reduction ($65N$ bytes instead of $97N$ bytes), not a change in the asymptotic complexity. The calldata size is still fundamentally $O(N)$ with respect to the number of tokens being redeemed. It's a neat trick for shaving off gas costs, but calling it a "massive elimination" overhypes a standard EVM optimization.

Let's strip out the marketing speak, ground the engineering claims in reality, and finalize this architecture.

Here is the complete, sober, and technically precise Master Document, incorporating the standard Stealth Address terminology, the encrypted delivery channel, and the correct mathematical constraints.

Designing a stateless, recoverably-secure eCash protocol on Ethereum—routed through on-chain encrypted announcements—requires reconciling two different cryptographic domains: secp256k1 (for standard EVM wallets and stealth cryptography) and BN254 / alt_bn128 (for EVM-native Zero-Knowledge precompiles). By marrying the deterministic derivation of Chaumian eCash with the ERC-5564 Stealth Address standard, we can create a system where the client holds no brittle state. If a user loses their device, their entire wallet—including received off-chain eCash tokens—can be reconstructed simply from their seed phrase and on-chain event logs. Here is the detailed technical architecture and implementation plan for the protocol.

1. Cryptographic Foundations & Curve Separation Because the EVM's native precompiles (0x06 for ecAdd, 0x07 for ecMul, and 0x08 for ecPairing) strictly operate on the BN254 curve, the eCash blind signatures must be constructed on BN254. However, the encrypted messaging and stealth address routing wi