Atlas

Public contract · Polygon

MassID

MASS-ID

The record of a verified batch of environmental material — what it is, what it weighs, and whose hands it passed through.

  • ERC-721
  • Non-transferable
  • Permanent record
View contract on PolygonScan opens in a new tab
MassID collection artwork

Contract address

0x94bcEd1786fcf0e90bB796d1C2B2A022F4c2E027

What this record proves

One record, three answers.

Every MassID holds the same set of answers, in the same format — that is what makes the network checkable by anyone.

01
What the material is
Type and subtype of the recovered material, declared in the batch's record.
02
What it weighs
The batch's verified weight, measured in the operation rather than estimated.
03
Whose hands it passed through
Every participant that handled the material, from collection to recycler, identified by the role they played.
Carrot DocsHow the MassID works in the protocolChain of custody, how the record is created, and what backs each field. opens in a new tab

Contract facts

What is written on the network.

Network
Polygon · chain ID 137
Standard
ERC-721
Symbol
MASS-ID
Contract address
0x94bcEd1786fcf0e90bB796d1C2B2A022F4c2E027
Issuance
Issued by the network when the batch is verified
Linkage
Every certificate issued traces back to one
Transfer
Non-transferable
Permanence
Permanent record
Contract metadata
ipfs://Qmenqgi3iDGbpAQypB3RkHrd3gHjCsVzK6DVx3She6WXej/mass-id.v1.json opens in a new tab

Position in the cycle

Where the MassID fits.

Five contract families cover the path from the material to the attribution of the outcome, across four stages. Each record points back to the one before it.

  1. 01

    Record

    The batch of material is verified and enters the network as a permanent record.

    • MassID
  2. 02

    Certification

    The reduction or the recycling is certified under an active methodology, and the credit is issued.

  3. 03

    Purchase

    The credit purchase becomes a public record, tied to the certificates it came from.

  4. 04

    Registration

    The credit leaves circulation and the environmental outcome is attributed for good.

Check it elsewhere

The record does not depend on Carrot.

Atlas gives context. The MassID contract's records are open on the network and can be inspected without asking anyone's permission.

PolygonScan

The contract, its transactions and the tokens it issued — straight from Polygon, without going through any Carrot service.

0x94bcEd1786fcf0e90bB796d1C2B2A022F4c2E027

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