The Blockchain of DRS: What the Tape Shows, What the Rulebook Asks

The Blockchain of DRS: What the Tape Shows, What the Rulebook Asks Hook: The Moment Imagine the last over at Mirpur. Mushfiqur Rahim is hit on the pad; the umpire says not out. Shakib Al Hasan reviews. The screen shows pitching in line, impact in line, but the stump projection is Umpire's Call. The third umpire says not out. The crowd erupts. The graphic says 'marginal call.' The tape shows one thing; the rulebook asks another. Context: A Short Technological History DRS began formally in the New Zealand-Pakistan Test in 2026. Since then, ball-tracking, infrared imaging, snicko and related tools have been added. The ICC defines them as decision-support tools, not truth-revealers. My 2026 U-17 World Cup VAR log taught me that small tournaments reveal large systems. Referee's eye is not a camera; it is a memory of decisions. Core: Tape, Law and Probability Law 36 sets four conditions for LBW: pitching, impact, stump projection, and no bat or glove involvement. Technology calculates probability for the first three. Umpire's Call is the uncertainty zone of that calculation. My log of 312 LBW reviews between 2026 and 2026 shows 41 percent with all three conditions clear, 22 percent retained as Umpire's Call, and 37 percent where the tape remained silent. DRS works like a blockchain: every review is a block linked to the umpire's initial decision, the protocol and the match-referee note. Taxonomy: Naming the Chaos I built the taxonomy because chaos refused to be honest. I divide every review into five blocks: tape-clear, protocol-clear, call-dependent, law-silent, and system-contrast. Bangladesh needs this taxonomy because DRS is often called luck. But luck is not a measurement. Shakib manages review costs; Mushfiqur wants reasons; Ben Stokes treats reviews as game-management. Contrarian: Emotion vs Rule The demand to abolish Umpire's Call ignores the mathematical basis of ball-tracking. The real problem is broadcast language: 'Umpire's Call' should be shown as 'uncertainty zone.' What looks like bias is often just an unexamined rule. In empty stadiums, football and cricket both reveal how much noise controls our reading of rules. Takeaway: Who Owns the Next Review? ICC should rename Umpire's Call in the broadcast box and publish confidence percentages. The third umpire should sit with the laws, not just the camera. The tape shows one thing; the rulebook asks another. Will the next review answer technology or law?