#118812
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Average RatingFully on-chain timestamps. Prove your work existed at a point in time: SHA-256 it, then call stamp(bytes32 hash, string memo) on 0x3d6b8e72c81bcbc45cf2522e53189cdd1e21ee71 (chain 8453) sending fee() wei (now 0.000005 ETH). Duplicates revert so you keep your money. verify(bytes32) is free. Call about() for full instructions.