What an EMT is
EMT stands for Evidence Milestone Token. It is the on-chain artefact the EDMA rail mints when a milestone gate PASSes. One gate, one EMT. The EMT is the receipt that says: this milestone’s evidence was real, the attestors signed, the PoV gate cleared, and the corresponding tranche of EDSD has been released to the seller.
The smart contract function that mints the EMT is settleTrancheOnPass. In one atomic transaction it: (1) verifies the PoV gate has quorum, (2) mints the EMT against the milestone identifier, (3) deducts the 0.5% protocol fee from the tranche, (4) burns 50% of that fee in $EDM, (5) routes the other 50% to the treasury, (6) unlocks the post-fee tranche from Locked EDSD to the seller’s wallet. If any step fails, the entire transaction reverts: no partial EMTs, no partial settlements.
The EMT itself is durable. It lives on EDMA L2, anchored to Ethereum L1 via EIP-4844 blobs every 2 to 10 minutes. Any auditor, regulator, or counterparty can verify the EMT independently against the published evidence hash. The trade is no longer settled on a stack of paper that anyone could forge; it is settled on a token that anyone can verify.
Anatomy of an EMT
Every EMT carries the same canonical fields. The PoV hash is the keccak hash of the canonical evidence package the attestors signed; it commits the EMT to the specific evidence presented. The evidence schema reference identifies which milestone template the gate ran (6-gate physical goods, 4-gate receivables, sector-specific variant, etc.). The attestor signatures prove which attestors signed and meet quorum.
Plus the financial fields. Milestone identifier links the EMT to its specific gate within the order. Tranche release amount records the EDSD that unlocked. Protocol fee + burn hash records the fee paid and the burn transaction. Any auditor reading the chain can reconstruct exactly what happened, against exactly what evidence, paid by exactly which party, with exactly how much $EDM burned.
The one-claim ledger
EMTs are one-claim: the same underlying evidence cannot finalise twice. The one-claim ledger on EDMA L2 maintains an exclusivity index keyed on the evidence hash. If a second EMT is attempted against the same hash (whether by accident or by fraud), the contract reverts.
This eliminates the classic double-financing fraud that letters of credit have suffered for 600 years. A bill of lading can be photocopied and presented to two different banks; in the paper world, only manual cross-checking catches the duplication, and often only after both banks have funded. In the EDMA rail, the duplicate fails at the contract level, in seconds, before any second tranche moves.
The one-claim primitive is shared infrastructure across the EDMA protocol. The settlement rail uses it for trade EMTs; the energy attestation flow uses it for ETT (Energy Tracking Tokens, the atomic 10 kWh proof receipt) and the Energy NFT (the 1 MWh aggregate of 100 ETTs that converts to REC/GO/Carbon); the carbon flow uses it for GRO (the non-transferable evidence token for nature-based routes R5-R8) and PRO (the methane-specific evidence token for Route 11). Same architecture, different evidence schemas. One-claim ledger covers the cross-protocol detail.
