Abstract: A system and method for verifying a cryptographic transaction includes requesting a portion of the blockchain comprising a merkle tree path; verifying a value of the cryptocurrency key using simplified payment verification; and bundling the cryptographic transaction, a block header of the cryptographic transaction, a plurality of block headers subsequent the block header of the cryptographic transaction, and the merkle tree path thereby forming a cryptographic currency receipt.

Abstract: A system and method for facilitating microtransaction involving an autonomous transacting device includes generating a plurality of key pairs and sharing a key of each of the plurality of key pairs with the transacting entity; establishing an escrow at the blockchain and providing the plurality of key pairs to the blockchain; exchanging one or more of the key pairs using a sidechain; requesting a release or a refund of funds from the escrow; and presenting one or more exchange key pairs to the blockchain thereby establishing a percent completion of the sidechain.