A method for verifying proof of assertion of a value using a hash-oriented transaction scheme includes: receiving a confirmation request; identifying a confirmation message, wherein the confirmation message includes at least one or more chain values and is one of: included in the confirmation request or stored in a block included in a blockchain and identified using a reference identifier included in the confirmation request; identifying a declaration message, wherein the declaration message includes at least an asserted value and an identity hash value; generating a check hash value by hashing at least the asserted value and the one or more chain values; verifying the check hash value using the identity hash value; and transmitting a result of the verification of the check hash value in response to the received confirmation request.