Blockchain Cryptography

Purpose

Guide the selection, implementation, and optimization of cryptographic primitives specific to blockchain systems. This skill enforces correct curve selection, signature scheme choice, and key management practices across all major blockchain protocols.

Agent Protocol

Trigger

"blockchain cryptography", "elliptic curve", "secp256k1", "BN254", "BLS", "Ed25519", "hash function blockchain", "Keccak-256", "SHA-256 blockchain", "Poseidon hash", "Merkle tree", "Merkle Patricia Trie", "Sparse Merkle Tree", "Verkle Trie", "ECDSA", "Schnorr signature", "BLS signature", "threshold signature", "FROST", "multi-sig", "aggregate signature", "zero-knowledge", "zk-SNARK", "zk-STARK", "Bulletproof", "circom", "Halo2", "BIP-32", "BIP-39", "BIP-44", "BIP-340", "PSBT", "BIP-174", "HD wallet", "key derivation", "cryptographic primitive", "signature scheme", "pairing-based cryptography", "post-quantum", "ecrecover", "EIP-712", "EIP-191", "RFC 6979", "KAT", "known-answer test", "nonce reuse", "signature malleability", "MuSig2", "threshold signing", "DKLs", "CGGMP", "aggregate signature", "hash-to-curve", "ICP", "Internet Computer"

Input Context

• Cryptographic operation (signing, verification, hashing, proof generation)
• Blockchain platform (Ethereum/Bitcoin/Solana/Cosmos)
• Security level requirement (128-bit / 192-bit / 256-bit)
• Performance constraints (verification throughput, gas budget)
• Key management model (single key, HD wallet, multi-sig, threshold)
• Threat model (passive/active, quantum-resistant needed?)