How Bitcoin Miners Actually Delegate to Core — The Technical Mechanics Behind the 89.9% Signal
Core DAO Deep Dive Series · Part 3 of 10
In Part 1, we established that 89.9% of Bitcoin's total mining hashrate is delegated to Core — and argued that this number represents a structural signal that the market has not yet fully priced in.
In Part 2, we catalogued Bitcoin's six deliberate limitations — the constraints that make a complement like Core not just useful, but necessary.
Now we need to answer the most important technical question: how does this actually work?
How does a Bitcoin miner — operating expensive hardware, competing in a global race to solve cryptographic puzzles, focused entirely on earning Bitcoin block rewards — simultaneously participate in Core's consensus mechanism?
The answer is both technically elegant and conceptually surprising. And buried within it is a question that no purely economic analysis can answer.
The Starting Point: What Happens When a Bitcoin Block Is Mined
To understand hash power delegation, you need to understand what happens when a Bitcoin miner successfully mines a block.
When a miner solves the proof-of-work puzzle and wins the right to add the next block to the Bitcoin blockchain, they construct that block and broadcast it to the network. The first transaction in every Bitcoin block is special — it is called the coinbase transaction.
The coinbase transaction is where the block reward is paid. It is how the miner claims their Bitcoin — currently 3.125 BTC per block after the April 2024 halving. Every miner, every mining pool, every block that has ever been added to the Bitcoin blockchain contains a coinbase transaction.
The coinbase transaction has a field called OP_RETURN. This field was originally designed to allow miners to include arbitrary data in their blocks — notes, timestamps, messages. In Bitcoin's early days, it was used for simple annotations. Satoshi Nakamoto's original genesis block famously included a newspaper headline in this field: "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks."
Core's delegation mechanism uses this same field.
The Technical Mechanics: What Gets Written in OP_RETURN
When a Bitcoin miner wants to delegate their hash power to Core, they include a specific sequence of bytes in the OP_RETURN field of their coinbase transaction. This sequence follows an exact format:
0x6a → OP_RETURN opcode
2d → Length: 45 bytes total
434f5245 → "CORE" in ASCII — identifies this as a Core delegation
01 → Version number
[20 bytes] → Core validator address (who receives the delegation vote)
[20 bytes] → Reward address (where CORE token rewards are sent)A complete example looks like this:
0x6a2d434f5245010a53b7e0ffd97357e444b85f4d68
3c1d8e22879aBD13F9435f8B327C222d1D1930C17ea6719e8a33This 45-byte sequence, embedded in the coinbase transaction of a Bitcoin block, is all that is required to delegate that block's hash power to a Core validator.
The Bitcoin block is mined normally. The proof-of-work puzzle is solved in exactly the same way. The Bitcoin reward is claimed in exactly the same way. The block is broadcast to the Bitcoin network in exactly the same way.
The only difference: 45 additional bytes in the OP_RETURN field.
The Data Flow: From Bitcoin Block to Core Network
Once a Bitcoin block containing the delegation metadata is mined and added to the Bitcoin blockchain, a multi-step process begins:
Step 1 — Relayers monitor the Bitcoin network
Relayers are participants in the Core ecosystem who run software that continuously monitors the Bitcoin blockchain. When they detect a new Bitcoin block, they transmit that block's header and relevant transaction data to the Core network. Anyone can become a Relayer by registering with the Core network and locking up a refundable CORE deposit.
Step 2 — Bitcoin light client processes the data
The Core network runs an on-chain Bitcoin light client — a lightweight implementation that can verify Bitcoin block headers without downloading the entire Bitcoin blockchain. This light client receives data from Relayers and verifies its authenticity.
Step 3 — Delegation Hub records the vote
The verified delegation information — which validator was voted for, how much hash power is represented — is forwarded to the Delegation Hub, the central component that manages and records all delegations within Core.
Step 4 — Hybrid score calculation (N+7 days)
Here is a detail that most analyses miss: Core does not use real-time delegation data. When calculating hybrid scores for validator election, Core counts the Bitcoin blocks from one week prior. If today is Thursday, Core counts the blocks delegated last Thursday.
This N+7 day lag creates a deliberate stability mechanism. It prevents sudden shifts in delegation from destabilizing the validator set. It means that a miner's delegation commitment today will be reflected in validator scores and rewards beginning approximately 7 days later, with rewards claimable from day 8 onward.
Step 5 — Daily validator election
Every 24 hours — each "round" in Core's terminology — the validators with the highest hybrid scores are elected to produce blocks on the Core network. The hybrid score incorporates hash power delegation (DPoW), CORE token staking (DPoS), and Bitcoin staking (Non-Custodial BTC Staking), with weights approximately distributed as 1/6 for hash power, 1/2 for CORE staking, and 1/3 for BTC staking.
As of May 2026, Core's active validator set comprises 25 validators out of 36 registered — with the protocol designed to support up to 31 active validators, a number expected to grow as the network scales.
Step 6 — CORE rewards distributed
Miners who delegated their hash power receive CORE token rewards, distributed to the reward address they specified in the OP_RETURN field. These rewards represent supplemental income on top of their normal Bitcoin mining revenue — earned at zero additional cost.
The Optimal Delegation Strategy
Core's official guidance to mining pools recommends distributing hash power across multiple validators rather than concentrating on one — allocating approximately 5% of total hash rate to each validator. With the active validator set currently comprising 25 validators out of 36 registered, this distributed approach maximizes both reward efficiency and network decentralization.
This recommendation exists because of how the hybrid score formula works. Concentrating all hash power on a single validator provides diminishing returns — the marginal benefit of additional hash power delegation decreases as a single validator accumulates more. Distributing across multiple validators maximizes both the miner's influence on the validator set and their reward efficiency.
This distribution strategy also explains something important about the 89.9% figure. The near-total delegation of Bitcoin's hashrate to Core is not the result of a few massive mining pools making a concentrated bet. It is the result of broad, distributed participation across the mining industry — pools of all sizes allocating portions of their hash power across Core's validator set, each following the economically optimal strategy.
The Question That Economic Analysis Cannot Answer
Here is where the analysis becomes genuinely interesting.
The CORE token rewards that Bitcoin miners receive for delegation are, at current prices, extremely small relative to their Bitcoin mining operations.
Consider the numbers. A large mining pool operating at 50 exahashes per second generates approximately $15-20 million per day in Bitcoin revenue at current prices. The CORE token rewards from delegating that same hashrate — at CORE's current market price — amount to a tiny fraction of that figure. We are talking about a difference of several orders of magnitude.
Pure economic analysis would suggest that miners of this scale should not bother. The reward is negligible. The administrative overhead of setting up and maintaining delegation, while minimal, is not zero. The rational actor model — applied strictly — predicts low participation.
The actual participation rate is 89.9%.
This gap between what economic theory predicts and what actually occurs demands an explanation. Several possibilities exist:
Possibility 1: Forward-looking price expectations
Miners are not valuing CORE at its current price. They are valuing it at the price they expect it to reach if Core's ecosystem develops as projected. A token worth $0.04 today that a miner believes will be worth $10 or more in five years is worth accumulating at scale — even if the current dollar value of daily rewards is small.
Possibility 2: Relationship and trust networks
The mining industry is not a perfectly anonymous market. It is a relatively small community of known actors with long-standing relationships. Participation in Core's ecosystem may reflect relationship-based trust in the people and institutions behind Core — not just a calculation of current reward value.
Possibility 3: Strategic positioning
Being an early, committed participant in a potentially significant ecosystem has strategic value beyond token rewards. Mining pools that establish deep integration with Core's validator set now are positioned to benefit disproportionately if Core becomes a major platform. Early positioning in emerging infrastructure has historically been one of the most valuable strategies in technology.
Possibility 4: Non-market influence
This is the possibility that the numbers alone suggest but that no public evidence definitively confirms. The scale and quality of participation — 86%+ of hashrate, institutional validators of global stature — is consistent with the hypothesis that individuals or organizations with significant global influence have been involved in building Core's ecosystem from an early stage.
Global influence of this kind is rare. The ability to bring together NYSE-listed custodians, Saudi national telecom subsidiaries, Alibaba-ecosystem companies, and Korea's four largest commercial banks — all as validators in a nascent blockchain with a market cap of approximately $40 million — is not something that a standard startup achieves through a whitepaper and a token sale.
We are not in a position to identify who that influence belongs to. The creators of Core have maintained the kind of anonymity that Satoshi Nakamoto established as a precedent for principled blockchain projects. But the pattern of participation is difficult to explain without it.
What "One of Them" Actually Means
Before we close this technical analysis, it is worth pausing on something that most blockchain coverage misses entirely.
Global institutional firms — the kind of organizations that appear in Core's validator set — have a deeply ingrained cultural resistance to what the business world calls "one of them" positioning.
Consider the nature of these organizations. A firm like BitGo, freshly listed on the New York Stock Exchange with $81.6 billion in platform assets, does not typically become validator number 17 out of 25 in a blockchain with a $40 million market cap. Firms of this caliber lead initiatives. They anchor ecosystems. They put their brand at the front — not buried in a list of dozens.
Blockdaemon — backed by Goldman Sachs, JPMorgan Chase, and SoftBank — does not typically accept a supporting role in someone else's infrastructure. It builds the infrastructure that others depend on.
ZAN — representing the Ant Digital Technologies brand of an Alibaba-ecosystem company with over one billion Alipay users — does not typically position itself as one participant among many in a project this early and this small.
stc Bahrain — subsidiary of Saudi Telecom Company with a $50 billion market capitalization and operations across 22 countries — does not routinely join nascent blockchain validator sets as one of thirty participants.
And yet, here they all are. Not leading. Not anchoring. Participating. One of twenty-five.
There is a specific word for what happens when firms of this caliber accept "one of them" positioning in an early-stage project: conviction. Not casual interest. Not exploratory investment. Not a marketing exercise.
The kind of institutional conviction that overrides the normal rules of brand management and competitive positioning. The kind that only emerges when sophisticated organizations with sophisticated analytical resources conclude — independently, through their own due diligence — that something genuinely important is being built.
The question of why that conviction exists — what these institutions know or believe about Core's trajectory that justifies accepting a subordinate position in its validator set — is one that the numbers alone cannot answer.
But the numbers make the question unavoidable.
What's Next
In Part 4, we will go inside the Satoshi Plus consensus mechanism itself — how the three components of delegation combine into a unified security system, and why this architecture is more robust than any single-component consensus mechanism.
The technical architecture is the foundation. The economic and institutional dynamics we have begun to explore here are what the architecture makes possible.
This is Part 3 of a 10-part series on Core DAO. ← Previous: [Part 2: Bitcoin's Six Limitations — Why the World's Most Secure Blockchain Needs a Complement] → Next: [Part 4: Satoshi Plus — The Consensus Mechanism That Unifies Bitcoin's Security With Ethereum's Functionality]
Related Reading: → [How to Earn Passive Income with Crypto Staking (2026)] → [How to Make Money with Bitcoin Without Trading: HODL Strategy (2026)]
Written by Dongbum Kim Former CEO (1,200-employee firm) · LL.B. · MBA (Univ. of Northern Iowa) · 3.5 Years Independent Blockchain Research
⚠️ This article is for educational purposes only and does not constitute financial advice. Always conduct your own research before making any investment decisions.
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