op-return-protocol ✓ verified on-chain
Proof of Existence — original address-encoded genesis
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The original Proof of Existence encoding (Araoz & Ordano, 2013), predating the DOCPROOF OP_RETURN method. 115 transactions share this exact signature (2 one-satoshi P2PKH outputs = 32-byte hash + 8-byte zero pad), forming a clean service lifecycle from 2013-06 through 2014-02 that stops precisely when PoE migrated to OP_RETURN (standardized in Bitcoin Core 0.9, March 2014). Block 238958 is the earliest. Self-discovered; not yet chain-verified.