Abstract: System and method for placing cryptographically secure data in a network comprising a public ledger, including associating a transaction inserting data in said network with a cryptographically secure transaction. The invention is an oracle schema that implements a mineable proof of work (POW) competition to eliminate reliance on trusted third parties for access to off chain data. Users engage in a POW competition to find a nonce which satisfies the requirement of the challenge. The users who find a nonce which correctly solves the POW puzzle input data for the POW Oracle contract and receive native tokens in exchange for their work.