A claim is easy to make and, in most cases, just as easy to lose — said once, in a room, to people who may or may not remember it, on a platform that may or may not still exist next year, in a format that may or may not be readable by the software available a decade from now. Whitehead's process philosophy offers a way of thinking about what it would mean for something to resist this kind of loss: for Whitehead, an "actual occasion" — any event, however momentary — does not simply vanish once it has occurred, but becomes a permanent feature of the universe's history, available forever afterward as something that other occasions can take up, reference, and build upon, even though the occasion itself is over. Nothing that has happened can un-happen; the question is only whether anything is positioned to make use of the fact that it happened. Cage's compositional practice, especially his use of chance operations and his insistence on treating silence and ambient sound as legitimate musical material, demonstrates a related point from the opposite direction: a performance can be radically unrepeatable, different every time, contingent on conditions — the room, the audience's coughs, the traffic outside — that will never recur in that combination again, and yet the score, the instructions, the conceptual framework that generated that unrepeatable performance can be deposited, fixed, made available for the next performance to take up in its own unrepeatable way. What survives, in Cage's case, is not the event but the generative structure — and this is close to what might be called ChronoDeposit: the act of fixing something in time, dating it, giving it a stable position in a sequence, so that it becomes available as a reference point regardless of whether the conditions that produced it persist. But a deposit alone, sitting in a repository, dated and stable, does not yet constitute proof of anything beyond its own existence — for a deposit to function as evidence for a claim, it has to survive not just storage but use, scrutiny, attempts to dismiss or contradict it, and it has to do so across contexts its creators never anticipated. Polanyi's account of tacit knowledge is useful here in an unexpected way: Polanyi argues that we know more than we can tell, that much of what we know is embedded in skills, habits, and judgments that resist full explicit articulation — and one implication is that a deposit, however thorough, can never fully capture the tacit knowledge that produced it, which means a deposit's evidentiary force always depends partly on something beyond the deposit itself, something that has to be reconstructed or trusted by whoever encounters it later. What allows this reconstruction to happen reliably, across time and across people who never met, is what might be called EnduringProof: not a single deposit but a deposit that has survived enough independent encounters, enough attempts at use, citation, and verification, that its tacit dimension has been at least partially externalized through the accumulated trace of those encounters. Wenger's account of communities of practice describes the social mechanism by which this externalization happens: a community of practice does not simply share explicit information, it develops shared ways of evaluating, using, and building on artifacts, so that an artifact's meaning and reliability become legible through the community's accumulated engagement with it rather than through the artifact alone. A ChronoDeposit becomes EnduringProof, then, not at the moment of deposit but through the slow accumulation of a Wenger-style community's engagement with it — Whitehead's permanent occasion finally finding the practice that can make use of its permanence, Cage's score finally finding the ensemble willing to perform it again.

Some forms of evidence work not by being present but by being conspicuously, structurally missing — a name that should be in a list and is not, a photograph that should exist and was never taken or was taken and destroyed, a generation whose testimony was never recorded because no one thought, at the time, that it would need to be. Mbembe's account of necropolitical power describes the mechanisms by which certain lives are rendered, in advance, as lives whose documentation does not matter — populations marked as disposable are also, by the same gesture, marked as not-worth-archiving, so that their absence from the historical record is not an oversight but an extension of the violence that made them disposable in the first place. This kind of absence does not behave like a gap waiting to be filled; it behaves like a pressure, a shape pressed into the record by everything that surrounds it, the way a missing tooth reorganizes the bite of an entire jaw even though the tooth itself contributes nothing. Spinoza's account of negation — his insistence that determination is itself a form of negation, that to define something is always simultaneously to exclude everything it is not — offers a way of thinking about this pressure formally: an archive's contents are determined as much by what has been excluded as by what has been included, and the exclusion is not a residual category but constitutive of what the archive can be said to contain. What might be called AbsenceHistory names this constitutive negative space: not the empty shelf, but the force that the empty shelf exerts on every shelf around it, the way silence in a score is not the absence of music but a precisely notated part of it. This pressure does not arrive without cost, and the cost does not simply disappear when the absence goes unaddressed — it accrues, transfers, and eventually must be reckoned with by someone, even if that someone is generations removed from whoever incurred it. Smith's account of decolonizing methodologies insists that research itself has historically been one of the mechanisms by which this kind of absence was produced and then naturalized — communities studied, catalogued, and represented by outside researchers in ways that served those researchers' institutions while leaving the communities themselves without equivalent records, without their own archives, with their knowledge extracted and deposited elsewhere under someone else's name. What accumulates here is not just absence but what might be called ObligationDebt: a liability carried by systems — archives, disciplines, institutions — that present themselves as neutral repositories of knowledge but that were built, in part, through exactly this kind of extraction, and that therefore owe something, structurally, to the absences they helped produce, whether or not any individual within those systems ever did anything that could be called wrong. Viveiros de Castro's account of Amerindian perspectivism — the idea that different beings, human and non-human, occupy genuinely different perspectival positions rather than simply having different beliefs about a single shared world — suggests one reason why ObligationDebt cannot simply be repaid through inclusion, through finally adding the missing names to the list: the absent perspective was never simply a missing data point within the existing framework, it was often a different framework altogether, and AbsenceHistory marks the place where that different framework would have been, a place that adding data cannot fill because the place itself was shaped by and for a framework that excluded it. A corpus that takes AbsenceHistory and ObligationDebt seriously, then, does not seek to complete itself by filling every gap, but learns to read its own gaps as load-bearing — as Spinoza's negations, as Mbembe's necropolitical shadows, as Smith's unrecorded knowledges — structurally present in the shape of everything that was, instead, recorded.