The Decision Ledger: Why Cricket's Review System Needs a Blockchain-Like Immutable Record

The screen flashes three letters — OUT. The crowd exhales as one, some lower their heads, some keep their eyes fixed on the giant screen. But nobody opens the ledger that records which exact frame the ball struck pad on, which camera angle made ball-tracking show 'wickets', and which sound wave produced the spike on UltraEdge. The match ends, the scorecard updates, and the history inside the review disappears. I have spent seven years chasing those vanished ledgers. When a referee's eye looks beyond the scorecard, it sees something uncomfortable: cricket's most powerful decisions — from DRS to match-referee sanctions — are written in a ledger whose pages are closed to the ordinary spectator. This is exactly where the lesson of blockchain becomes relevant: immutable, timestamped, verifiable by anyone — a ledger where every review carries its own history. For context, DRS began in July 2026 with the India-Sri Lanka Test. The early fear was that technology would turn the game into a machine. Sixteen years later the opposite is true — technology does not run the game; the game's power structure runs the technology. The MCC Laws and the ICC Playing Conditions together decide who may review, how many reviews a side gets, and under what conditions a decision is overturned. Two unsuccessful reviews per team in Tests, one in ODIs and T20Is, and a reset after eighty overs in Tests — that arithmetic is the rule, but the psychology and politics hidden inside it are written nowhere. My rule has been clear from the start: when the whistle blows, evidence before story. In 2026, after a Bangladesh Premier League match in Khulna ended 2-1 on an 89th-minute handball penalty, I watched the clip forty-seven times and then published a twelve-part thread citing IFAB Law 12 and the 2026/17 handball reinterpretation. That thread reached twelve thousand readers in seventy-two hours and forced the local federation to issue a written clarification. That day I understood something: the rule was never the point; the rule was the flashlight. The real point is whether anyone can see the chain behind a decision. Since 2026, serving as one of three Bangladesh Cricket Board advisors overseeing digital and media affairs, that realisation has only deepened: when an institution keeps the record, it also keeps the power. The parallel between blockchain and cricket review may sound sentimental, but at the level of process both are solving the same problem — trust. In a blockchain, each block carries the hash of the previous one, so old entries cannot be quietly altered. In DRS the opposite happens. A ball-tracking company issues its prediction, the third umpire studies the screen, a decision emerges — but the confidence margin of the tracking, the frame-rate of the camera, and which exact clause of the protocol was applied leave no immutable record anywhere. The moment a spectator asks 'why', the system falls silent. Modern ball-tracking typically runs on six to eight high-speed cameras, analysing each frame to project the ball's path. UltraEdge, or real-time Snicko, detects sound waves and syncs them to video. The problem is that sound and image do not always align to the same frame — sometimes the spike arrives a frame early, sometimes late. That single-frame gap is precisely what turns 'out' in one match into 'not out' in another. Technology is not perfect, and the limit of the technology is itself information — yet that information is withheld from the viewer. This withholding is the precise inverse of blockchain. In a blockchain every transaction receives a timestamp and a unique hash, and every node in the network verifies that entry — one party's record is checked against another's. Cricket review already has many 'nodes': front-on cameras, behind-the-stumps angles, ball-tracking, sound sensors, and the third umpire's judgement. But no shared 'consensus record' is produced among them; each decides in its own room, and only the outcome is announced outside. If every step of a review were written to a public ledger, the invisible wall between umpire and spectator would largely collapse. I kept a ledger of every VAR decision in Russia, and the margins told a story. Across the 64 matches of the 2026 World Cup I tracked 29 penalties — including Antoine Griezmann's spot-kick from VAR in the 38th minute of the France-Croatia final after Ivan Perišić's handball. But recording outcomes alone would not do; I sorted each review into three columns — trigger, evidence, outcome. Because once a decision is written into a ledger it stops being one person's opinion and becomes a verifiable document. In blockchain language, each review becomes a block — chained to the previous one, timestamped, hashed. In the silent study, the whistle stopped, and the game finally spoke. In 2026, analysing 83 Bundesliga matches played behind closed doors during COVID, I found that the home win rate fell from 43.3 per cent to 33.7 per cent and average added time rose by 1.4 minutes. In other words, crowd noise influences the referee more than technology does. The game's biggest 'referee' is not a screen — it is environment. So if a blockchain ledger records only ball and stumps while omitting crowd density, temperature and travel distance, we will record the outcome of decisions but not their cause. Now to the trap most common in cricket analysis. 'Umpire's call' is not the name of a logic; it is the name of a margin. When ball-tracking shows the ball almost grazing the stumps, the protocol says the decision stands. Some call this a technological weakness, some a technological fairness. The truth is that it is the game's acknowledgement that even machines have an error threshold. But that threshold is never transparently declared. The viewer sees only a ball-path line, never the confidence level. The lesson of blockchain is here too: rather than hiding incomplete information entirely, it is more credible to display the degree of incompleteness. And this brings the relentless question nobody wants to voice: do big teams really get different decisions? I do not dismiss this as conspiracy theory, nor do I tell a simple favouritism story. I say that stadium aura and media pressure together create an environment, and in that environment the margin of a decision sometimes tilts slightly to one side. When the roar of a full stadium influences even camera frame-selection before a review, that is nobody's crime — it is a system flaw. An immutable ledger can render that invisible pressure visible: how long a review lasted in a given match, how often a particular umpire's decision was overturned — such data moves allegations of bias out of emotion and into the realm of proof. The third-umpire protocol holds the most practical application of blockchain-style transparency. Today a review's outcome is announced, but the path to that outcome is never described. Which angle was seen first, why the UltraEdge spike was discarded, which ball-tracking frame was taken as the base — had this decision tree been shown on broadcast, the viewer's trust deficit would shrink considerably. The method I used in Khulna — one rule, one video timestamp, one decision tree — is in fact blockchain's first lesson: keep a verifiable entry behind every claim. At the governance level the matter is clearer still. The match referee imposes sanctions under the Code of Conduct, and slow over-rates draw fines — but these decisions often rest on discretion. Blockchain's 'smart contract' concept could apply here: when pre-defined conditions are met, a sanction takes effect automatically, without human intervention. That would reduce room for favouritism or pressure, making every decision predictable and equal. Yet a caution is essential here — cricket's rulings are not uniform, and context differs. Fully automated justice can sometimes become harsher than fairness. So the ledger should be transparent, but human judgement must remain before the final verdict. There is another layer that is often overlooked — predictive risk. Which ground will take dew, at which venue the heat will tire umpires, in which match tempers will run high — all of this can be anticipated. If a decision ledger also carried these variables, it would become possible to forecast review controversies. I have always said the best referee is the one who reads the situation before a controversy arises. The job of technology is the same — not to stop controversy, but to learn to see it in advance. Still, the questions are not only about outcomes but about the 'chain of custody' of a review. A ball is delivered, captured on camera, the data is processed, converted into code, and then arrives on the third umpire's screen — every step of that path can go wrong. If it is not known who processes that data and which algorithm is running, the fairness of the final decision is also in doubt. A blockchain ledger could chain the entire path, so that if any single step is tampered with, everyone else detects it. The constraints on implementation cannot be denied either. Every match needs high-speed cameras, ball-tracking software and trained operators — the cost is high. Easy for large boards, hard for small ones. If, in a place like Bangladesh, this technology exists only in major tournaments and not in domestic cricket, inequality only widens. So the transparency of technology is meaningful only when it reaches every tier, small and large. And the greatest warning comes when the ledger is entirely blank. Imagine a match's analytical ledger holds no information at all; every cell is empty, every decision 'unknown'. What happens then? Then storytellers fill the blanks with their own imagination. When proper evidence of a disputed decision is missing, people choose story over proof — and that story later settles in as truth. An empty ledger is not itself dangerous; what is dangerous is claiming an empty ledger is full. The entry of data analysts deserves reflection here too. The game now has strike-rate curves, expected-run models, pitch mapping — everything. But a model cannot capture a match's tension, fatigue and pressure. If a blockchain ledger records only numbers and leaves out the human in the match, that is not transparency — it is another kind of blindness. The job of technology is not to replace judgement but to make judgement accountable. Here I want to stand against my own proposal. A fully open, universal review ledger would undoubtedly bring transparency, but throwing every frame of every match open to all would breed new risks. Players' biometric data, private moments behind the camera, even patterns usable by betting markets — all of this could become part of the ledger. A balance between transparency and privacy is needed; everything open does not mean everything safe. And the biggest danger in the system is often invisible: the more mechanical decisions become, the less an umpire's discretion is used. If every ruling is confined to screen and algorithm, the ability to read a match's context and decide will be lost. Yet cricket's beauty is that behind every ball there is a story — a tired bowler, a batsman under pressure. Technology that cannot see that story cannot deliver justice. So my proposal is not to remove the human; it is that human and technology together build a transparent chain, in which everyone can see the reason behind every decision. Looking ahead, my forecast is simple: within the next five years at least one major cricket tournament will launch a decision ledger in which every review is publicly verifiable, complete with timestamp, camera angle and protocol wording. The question is no longer about technology — it is about will. Will cricket's administrators place the chain of evidence in the spectator's hand, or keep the history of decisions hidden behind the scorecard? Whoever opens the ledger before the whistle blows is the one who truly protects the game.