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krakendb ======== This is a quickly written utility that generates a binary tree containing a summation of the nodes below it and a verifier hash, similar to the one described by gmaxwell (https://iwilcox.me.uk/v/nofrac). Usage: krakendb <dbname> [key=verifier key] [<position>|<hash>|root|dump|gendata] When run, if the db file <dbname>.tree does not exist, it will attempt to use <dbname>.data to generate <dbname>.tree. For testing purposes, the gendata option can be used to generate a test <dbname>.data file. Generation of the tree requires a verifier key, set with the key=verifier-key option. The nodes of the tree are hashed using: Leaf nodes: hash = SHA256(SHA256(code || ":" || value)) , where code is a random salt code for the account to make brute forcing of value more difficult and value is the value of the account. code and value are known to the account holder but not to anyone else so that thee user can verify that their node hash is indeed what is claimed. Interior nodes: hash = SHA256(left.hash || right.hash) After the tree has been generated, the key option is no longer necessary and options to dump the entire tree, query for the root node, or query for all the nodes and adjacent nodes between the leaf node and the root node are available. Note that when querying by leaf node hash value, the hashes are not guaranteed to be unique and only the first entry is returned. In order to protect privacy (both the business and its users), a third party is necessary to ensure that the tree is correctly being generated with the proper math at every node, and that there aren't any negative values at the leaf nodes designed to deflate the value of the root. Note that there may sometimes be negative values for some accounts for various reasons, but there should not be a lot of negative amounts and any that have a large negative amount require further investigation as to the reason for it.