GapLimit
GapLimit library

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R04Collision Lab

The hundred-year key

Supported
A bronze coin can sleep in a drawer for a century and remain itself. A private key has no such independence. It survives only while humans preserve a readable secret, the rules that interpret it, compatible software and a path to a living network.

The short answer

Long-term self-custody is a migration practice, not a one-time storage purchase. Media decay, format obsolescence, cryptographic change, lost context and human succession fail on different clocks. A durable plan periodically verifies and moves every layer before it becomes unreadable.

Original GapLimit object

Five clocks of digital ownership

A plan fails when the shortest-lived layer expires unnoticed.
  1. 01
    MediumPaper, metal, memory card or secure service
  2. 02
    FormatWords, shares, descriptors and derivation context
  3. 03
    CryptographySignature rules and address policy
  4. 04
    SoftwareA maintained path to restore and sign
  5. 05
    Human authorityWho may discover, test and migrate
01

Storage is a process

The Library of Congress advises multiple media, separate locations and periodic migration for personal digital files. A recovery phrase on paper or metal differs from a file, but the archival lesson holds: no medium removes the need for inspection, context and planned replacement.

02

The secret is not the whole archive

Words alone may not reveal which derivation path, passphrase, network, wallet policy or multisignature quorum created the addresses. Documentation adds context, yet documenting too much beside the secret can help a thief. Preservation and confidentiality pull in opposite directions.

03

Standards age too

A functioning device can outlive support for its firmware, connector or signature scheme. The asset remains on-chain, but spending may require migration before software ecosystems abandon the old path. Waiting for failure turns routine maintenance into emergency archaeology.

04

A century needs successors

A plan that only its author can understand expires with the author. Successors need lawful authority, discoverability, enough instruction to test recovery, and limits that prevent premature access. The contradiction cannot be purchased away; it must be governed.

Thesis audit

Pressure the bridge

Causal bridge
Long ownership horizon → multiple media, format, cryptographic and human lifecycles → repeated verification and migration.
Counterforce
A regulated custodian or regularly rotated institutional policy can transfer much of the preservation burden, while adding counterparty dependence.
What would prove it wrong?
The migration thesis weakens only if a recovery representation and its interpretation remain reliably readable, secure and supported across generations without active maintenance.
Largest uncertainty
No storage method has a universal century-scale failure rate across environments. The framework avoids claiming one medium is permanent.

Source ledger

Evidence carrying this piece

Sources accessed 2026-09-06. Links point to the originating institution where available.
  1. Library of Congress · Personal Digital ArchivingPreservation and media-lifecycle principles
  2. Library of Congress · Reformatting FAQMultiple copies, locations and periodic migration guidance
  3. NIST SP 800-57 Part 1Cryptographic key-management lifecycle
  4. BIP 39 specificationRecovery mnemonic specification and limitations