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Informational 15 Bitcoin

coin_mvt: use bitmap instead of tal_arr for tags.

Public commit record

What the developer wrote

Authored by Rusty Russell

80/100 · Strong
coin_mvt: use bitmap instead of tal_arr for tags.

We're going to store them in the db this way, so I thought I'd see what it looks like if
we lift that interface all the way through.

We use a struct, so that types are checked strictly.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
✓ Descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context✓ Explains rationale or failure mode
The short version

What changed, and why it matters

This commit is a straightforward internal refactoring: it replaces a variable-length list of text labels (called a 'tal_arr') with a compact 64-bit bitmap (a 'struct mvt_tags') for tracking coin-movement tags. The change touches many call sites but does not alter what the tags mean, how money moves, or any security boundary. It is not a security fix and introduces no obvious vulnerability.

Recommended action

No security action required. Treat as normal code-review item; verify that the new bitmap covers all existing tags and that the wire-format change is compatible with the intended database schema.

Security signals we found

No strong security signals were identified.

Risk score

Why this scored 15/100

Our methodology →
Potential impact 0/30
Exploitability 0/25
Stealth signal 0/15
Affected reach 0/15
Confidence 10/10
Evidence quality 5/5
Human-validated context

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