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<!-- Generated by CompSci Transform (tm) - http://www.compsciresources.com -->    
<!-- Created: Wed Apr 08 04:56:58 UTC 2026 -->  
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    <loc xlink:type="locator" xlink:label="sbac_SponsorUnitsMember" xlink:href="sbac-20260408.xsd#sbac_SponsorUnitsMember"/>     
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    <loc xlink:type="locator" xlink:label="sbac_UnderwriterPlacementUnitsRedemptionScenarioMember" xlink:href="sbac-20260408.xsd#sbac_UnderwriterPlacementUnitsRedemptionScenarioMember"/>  
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSecurityClassesMember" xlink:to="sbac_UnderwriterPlacementUnitsRedemptionScenarioMember" order="31" xbrldt:closed="true"/> 
    <loc xlink:type="locator" xlink:label="sbac_ClassBOrdinarySharesForfeitedIfOverallotmentIsNotExercisedRedemptionScenarioMember" xlink:href="sbac-20260408.xsd#sbac_ClassBOrdinarySharesForfeitedIfOverallotmentIsNotExercisedRedemptionScenarioMember"/>   
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    <loc xlink:type="locator" xlink:label="sbac_WithoutOverAllotmentMember" xlink:href="sbac-20260408.xsd#sbac_WithoutOverAllotmentMember"/> 
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    <loc xlink:type="locator" xlink:label="sbac_SubversiveBitcoinAcquisitionCorpMember" xlink:href="sbac-20260408.xsd#sbac_SubversiveBitcoinAcquisitionCorpMember"/>     
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    <loc xlink:type="locator" xlink:label="sbac_WorkingCapitalMember" xlink:href="sbac-20260408.xsd#sbac_WorkingCapitalMember"/>    
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    <loc xlink:type="locator" xlink:label="sbac_InitialBusinessCombinationMember" xlink:href="sbac-20260408.xsd#sbac_InitialBusinessCombinationMember"/>   
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