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New chain support: - Polkadot mainnet (DOT, 10 decimals) - SS58 address encoding/decoding (zero-dependency, blake2b) - Substrate JSON-RPC client (raw fetch, no @polkadot/api dep) - Deposit detection following existing polling pattern - SCALE extrinsic builder + MPC sr25519 signing interface - LDOT/ZDOT wrapped tokens on Lux/Zoo Files: - substrate-address.ts — SS58 encode/decode (13 tests) - substrate-client.ts — balance, nonce, broadcast (7 tests) - substrate-deposit.ts — DOT deposit detection - substrate-signer.ts — MPC signing integration - Updated: networks.ts, mpc-wallet.ts, swap-pairs.ts, network-type.ts