OCEAN

The pool's defining technical architecture is DATUM (Decentralized Alternative Templates for Universal Mining), a proprietary open-source protocol Mummolin released in September 2024 that lets connected miners construct their own block templates via a local Bitcoin full node. Unlike Stratum V2's negotiated-template approach (where the pool can accept or reject a proposed template after inspecting the transaction list), DATUM is unilateral: the pool receives only Merkle branches and remains cryptographically blind to transaction contents, making pool-level transaction censorship architecturally impossible rather than merely policy-dependent. Miners running the DATUM gateway pay a discounted 1% pool fee; the standard rate is 2%.

OCEAN's payout model eliminates the pool as a custodial intermediary: block rewards are disbursed directly from the coinbase transaction to miners' registered Bitcoin addresses. The pool additionally supports Lightning Network payouts via BOLT12 offers, addressing the dust-output problem for small miners operating below on-chain economical thresholds. Setup requires no account registration; a Bitcoin address is the only credential.

In November 2023, Mummolin closed a $6.2 million seed round led by Block CEO Jack Dorsey, with participation from Accomplice, Barefoot Bitcoin Fund, MoonKite, NewLayer Capital, and the Bitcoin Opportunity Fund, announced at the Future of Bitcoin Mining Conference. In April 2025, Tether committed to directing its existing and future hashrate to OCEAN using the DATUM Gateway, one of the largest single institutional hashrate commitments the pool has publicly disclosed.

Mummolin established an international hub in San Salvador, El Salvador, in 2024, citing the country's Bitcoin-friendly regulatory environment; pool president Mark Artymko announced the entity publicly. As of May 2026, OCEAN reports a live pool hashrate of approximately 19.83 EH/s. In November 2025, the company earned SOC 2 Type 1 attestation from independent auditor AARC-360 against AICPA standards; it subsequently completed a SOC 1 Type 1 examination and has stated it is advancing toward Type 2 reports under both frameworks.

OCEAN competes in a pool market where Foundry USA and AntPool collectively direct block template construction for the majority of Bitcoin's global hashrate. With Tether's hashrate committed via DATUM and enterprise-grade compliance certifications now in place, OCEAN's near-term trajectory is toward attracting larger institutional mining operators who require both censorship-resistance guarantees and audited security controls.