MRV-P Protocol v0.4 — an open protocol for auditable measurement of steel recovered in ship and port dismantling

MRV-P specifies how recovered steel mass is measured, evidenced, scored and reconciled in the dismantling of ships, port equipment and comparable steel-bearing industrial assets. It sets the unit of measurement at the load rather than the campaign; requires an evidence layer per measurement (original certified weighbridge ticket, reconstructed record, or estimated value, weighted 1.00 / 0.60 / 0.30); scores each lot on six dimensions and carries a separate confidence tier stating whether the evidence agrees with itself; requires reconciliation against official weight, with divergence beyond 0.15 going to conformance review rather than to silent revision of the estimate; and requires the implementer to publish its own estimating error and its carbon factors together with their denominator. The protocol is published openly so that a second party, including a competitor, can implement it on their own yard and obtain a comparable number. Version 0.4 is a draft for comment: it codifies a method already in production, derived from one fully instrumented campaign, and has not been ratified by any standards body. Context: the Hong Kong International Convention for the Safe and Environmentally Sound Recycling of Ships entered into force on 26 June 2025 and requires chain of custody and audit of the physical destination of removed steel. This protocol specifies the record-keeping capability that requirement assumes. Published by GSR Logistica Reversa Naval. Includes two machine-readable campaign examples conforming to the protocol schema.