Group: Crums

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I/O and other utilites. This library's more common constructs are gathered here.

JSON library. A source-compatible, minimally updated fork of simplejson.

A flexible Merkle tree implementation with support for navigating the tree's nodes and constructing Merkle proofs (about an item's existence in the set).

Adds more niche capabilities to io-util. (Less commonly used constructs gathered here.)

A low level library for fixed width tables. Provides methods to sort tables using custom row-order functions, both in memory, and for larger tables, via on disk multi-merge sort.

Timechains and proofs of order of operations.

Support for repeatable tests that need to interact with the file system. Artifact intended for scope *test*.

Notary for witnessing hashes and issuing witness receipts.

The skip ledger, the base data structure as a commitment scheme.

An lightweight JSON template format for generating PDF reports. The goal is to embed customizable, branded templates in morsel files, so that one can output PDF reports from them.

The skip ledger, the base data structure as a commitment scheme for append-only ledgers. Differentially proves any cell value in the ledger using compact packaged proofs called morsels.

Simple scalable hash based file-per-object store and deeper-as-you-grow hash tree directory structure.

CLI for encoding witnessed SHA-256 hashes on one or more timechains and local archival and retrieval of trail proofs.

Crums Timechain REST server.

Collection of modules and tools for maintaining tamper proof, evolving, historical private ledgers and for differentially revealing (reporting) any of their parts in an efficient, provable way.

A small collection of utility modules for Java Collections, JSON, general I/O (java.nio), buffers, and persistent fixed width tables.

Crums data model (for vending witness records), parsers (JSON) and utilities

SQL implementation of the hash ledger. The hash ledger is a skip ledger annotatated with crumtrails (witness records).

Command line tool for converting base64-32 encoded bytes to hexadecimal and vice versa.

Command line tool for working with morsel files. Verification, output, merges, redactions, as well as some minimal presentation capabilites.