Tamper-Evident AI Decision Ledger (2D)

Ledger Controls

Decision rate 1.0 / sec

Explainability threshold 60%

Data fields stored (minimization) 3

Chain Status

Chain length

Flagged (low exp.)

Integrity

valid

Selected Block

Click a block in the ledger to inspect its record and hash.

How it works

Every automated decision (e.g. a loan approval or content-moderation call) is written as a record and chained to the one before it, exactly like an append-only audit log:

hash(n) = H( hash(n-1) || data(n) )
record(n) stores: data(n), prevHash = hash(n-1)

The integrity check walks the chain and verifies, for every block n, that record(n).prevHash still equals the *currently recomputed* hash(n-1):

Untampered chain — every stored prevHash matches, so the whole history is provably unaltered.
Tamper a block — editing its data changes its live hash, but the next block's prevHash was fixed at creation time. The mismatch appears at that block and propagates forward — this is what "tamper-evident" means: you can't quietly rewrite a past automated decision without the break becoming visible.
Explainability threshold — records below the required score are flagged (amber), modelling a review gate for decisions that can't be adequately justified.
Data fields (minimization) — fewer stored fields shrinks each block's footprint (and shortens the string hashed into the chain), showing the transparency/accountability trade-off against collecting less personal data per decision.

The hash inspector panel below the ledger shows the exact byte-level effect of a tamper: the stored prevHash of the next block is frozen at creation time, while the "live" recomputed hash of the block you edited changes — every mismatched hex digit lights up red.

Real systems use cryptographic hashes (SHA-256) instead of the demo hash here, but the tamper-evidence property — any retroactive edit is detectable — is exactly the same mechanism behind blockchains, Merkle trees, and append-only audit logs used for AI accountability.

Drag to pan · scroll/pinch to zoom · click a block to inspect

Valid record Low explainability Tampered / broken link Selected

Hash link inspector

Explainability across chain

Tamper-Evident AI Decision Ledger (2D)