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- Field Notes / No. 026
No. 026 Method Black Box In research 13 min read

The ISWC-ISRC matching problem, measured.

Of the recordings in our reference corpus, a material percentage cannot be reliably linked to a registered work via ISWC-ISRC matching. No link means no royalty routing.

- Status

Deep-research pass under way.

This piece is in the research pipeline. The thesis and the questions we are answering are below. The fully-drafted article will publish when the desk has finished working through the literature. Subscribe via the contact form to be notified when it lands.

- Thesis

The argument.

The ISWC-ISRC matching problem is the second-largest silent failure in the global royalty pipeline (after CWR errors). This paper quantifies the matching gap against our 207-million-track reference corpus, classifies the four most common root causes, and describes the resolution methodology.

- Research questions

What we are answering.

  • What is the ISWC and how widely is it adopted - coverage of the global repertoire?
  • Published research on ISWC-ISRC matching accuracy or failure rates?
  • Documented root causes - missing ISWCs, multiple ISWCs per work, ISRC reuse, metadata inconsistency?
  • Work by DDEX, CISAC, or academic researchers on identifier resolution?
  • How does MusicBrainz approach work-to-recording matching - what does its data say about the scale?
  • What do commercial databases (Gracenote, AllMusic, Luminate) claim about coverage?
- Tone & format

How it will read.

Technical method paper. Quantitative and specific. Reads like a data-engineering post-mortem with commercial implications.

- Related

Read alongside this piece.

No. 023 · Method

CWR: the registration format that has been breaking royalties since 1999.

A significant percentage of CWR transactions contain errors that cause royalties to fail silently. Accepted by societies but matched to the wrong work, the wrong writer, or no work at all.

Read →
No. 020 · Method

How a distributor's ISRC block becomes your fraud exposure.

ISRCs issued within the same registration block can be exploited to mask artificial streams across a catalogue. Most labels do not understand the issuance chain - therefore cannot identify the attack vector.

Read →
No. 022 · Forensic

The estate that did not know it owned half the song.

A 1970s co-write, a deceased writer, a publisher acquisition in 2004, and three conflicting society registrations. A significant royalty balance uncollected for over a decade.

Read →