Odocrypt is DigiByte’s (DGB) distinctive, self-modifying Proof-of-Work mining algorithm. It is one of the five parallel algorithms in DigiByte’s MultiAlgo system (alongside SHA-256d, Scrypt, Skein, and Qubit), with each algorithm targeting roughly 20% of blocks.
Introduced in July 2019 at block 9,100,000 as part of DigiByte Core v7.17.2, it replaced the older Myr-Groestl algorithm. The name comes from Odo, the shapeshifting character from Star Trek: Deep Space Nine a fitting reference because the algorithm periodically changes its own internal structure.
How Odocrypt Works
Odocrypt is not a fixed hash function. It is a keyed permutation (a substitution-permutation network) composed with Keccak (the SHA-3 standard). Both the substitutions (S-boxes) and permutations (P-boxes) are regenerated from a key derived from the block timestamp:
OdoKey = nTime - (nTime % nOdoShapechangeInterval)
On mainnet the interval is 10 days (exactly 57,600 blocks given DigiByte’s ~15-second block time). Every node independently computes the same key from the clock, so no extra coordination is needed. When the epoch ends, the algorithm’s internal structure is rewritten.
This design is intentionally optimized for FPGAs: it uses small (6-bit) S-boxes well-suited to FPGA logic elements and larger (10-bit) S-boxes that fit FPGA RAM. The result is that reprogrammable hardware can simply be re-flashed each cycle, while fixed-function silicon cannot keep up economically.
What Makes Odocrypt Unique Among DigiByte’s Algorithms
DigiByte’s other four algorithms are conventional and relatively static:
- SHA-256d – Bitcoin’s algorithm, dominated by ASICs.
- Scrypt – memory-hard, mined by ASICs and some GPUs.
- Skein and Qubit – more GPU-oriented.
Odocrypt is the outlier. While the others stay fixed for years (allowing specialized ASICs to dominate their lanes), Odocrypt deliberately becomes a moving target. Manufacturers have little incentive to design and fabricate a custom ASIC that will be obsolete within days of shipping. This keeps the Odocrypt “lane” oriented toward flexible hardware primarily FPGAs—rather than dedicated silicon.
Within DigiByte’s MultiAlgo architecture, this creates meaningful diversity: different hardware ecosystems (ASICs, GPUs, FPGAs) secure different portions of the chain. An attacker would need to overwhelm all five lanes simultaneously, raising the cost and complexity of a 51% attack.
Why Odocrypt Is Special
Its special quality is economic ASIC resistance through polymorphism, not just cryptographic hardness. Most “ASIC-resistant” algorithms eventually succumb once the market becomes large enough to justify custom silicon. Odocrypt attacks the economic premise itself: the function changes so frequently that the development and fabrication cycle of an ASIC cannot keep pace.
Key benefits include:
- Reduced risk of long-term, permanent ASIC lock-in on that portion of the network.
- Continued viability for hobbyist and smaller miners using affordable FPGAs (entry-level boards such as the DE-10 Nano or Cyclone V can cost as little as ~$100).
- A more adaptive, resilient mining landscape overall.
- An educational use case FPGA reprogramming every 10 days provides a practical learning opportunity in hardware design.
It does not make the Odocrypt lane invulnerable or automatically more decentralized in isolation (FPGA hashrate can still concentrate). Its real contribution is keeping one-fifth of DigiByte’s security model flexible and resistant to the classic “ASIC arms race” pattern that has centralized many other chains.
Which Other Blockchains Use Odocrypt?
None. Odocrypt was purpose-built for DigiByte and remains exclusive to it. Mining calculators and algorithm trackers list DigiByte (DGB) as the sole coin using the algorithm. No other major (or minor) blockchain has adopted it.
This exclusivity reinforces DigiByte’s identity as a multi-algorithm, hardware-diverse PoW chain that has continuously produced blocks since 2014 while actively evolving its security model.
In short, Odocrypt is DigiByte’s shape-shifting defense against mining centralization an elegant, practical solution that keeps one lane of the network open to reprogrammable hardware and raises the bar for any single class of miners to dominate the entire chain.
