Smart contracts of the Carrot network.

Explore the contracts that record materials, certify outcomes, represent credits and document their purchase and retirement.

Public records and network credits

Material

The batch and its journey.

Material record

ERC-721 · NFT

MassID

Identifies a batch of material, with its type, mass and published collection, transport and treatment events.

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Certificates

Two outcomes, with different measures.

Emission reductions

ERC-721 · NFT

GasID

Records the certified quantity of greenhouse gas emission reductions, in tonnes of CO₂e.

Under BOLD Carbon (CH₄): methane reductions through composting.

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Material recycling

ERC-721 · NFT

RecycledID

Records the certified mass of recycled material, in tonnes, under the applicable verification rules.

Under BOLD Recycling: organic waste (Biowaste) recycled through composting.

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Credits

The units issued from certified outcomes.

Carbon creditERC-20

C-CARB.CH4

Represents verified emission reductions through methane prevention in composting.

1 tCO₂eper credit

Source certificate: GasID

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Recycling creditERC-20

C-BIOW

Represents the mass of Biowaste certified as recycled through composting.

1 tper credit

Source certificate: RecycledID

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Receipts

The purchase and removal of credits from circulation.

Credit purchase

ERC-721 · NFT

Credit Purchase Receipt

Records the type and quantity of credits purchased, with the certificates backing them.

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Credit retirement

ERC-721 · NFT

Credit Retirement Receipt

Records the type and quantity of credits permanently removed from circulation, with their source certificates.

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How the records connect.

Each certificate is linked to a MassID. Purchase and retirement receipts identify the certificates backing the credits involved.

Verification frameworks define the evidence and criteria required to certify an outcome.

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Is a contract the same as a record?

The contract is the program. ERC-721 contracts issue individual records, such as MassIDs, certificates and receipts. ERC-20 contracts represent amounts of fungible credits, including fractions.

Are these all of Carrot’s contracts?

This index covers the public-record contracts and the two credit types presented on Atlas. Controllers, custodians and registries are part of the protocol infrastructure, documented in Carrot Docs.

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