Owner: @Thomas Lavaur
Reviewers: 🟢@Mehmet 🟢@Daniel Sanchez Quiros 🟢@Álvaro Castro-Castilla 🟢@David Rusu
In Mantle, each Mantle Transaction contains one Ledger Transaction and one or more Operations. These components consume gas, measured through fixed gas units that reflect their execution or storage impact. Nomos introduces three independent gas markets:
Gas constants are carefully calibrated to reflect the computational and storage requirements of different operations on the Nomos blockchain. By standardizing gas measurements, the system can accurately charge fees proportional to resource usage, preventing network abuse and incentivizing efficient transaction design.
We conducted a comprehensive analysis of execution requirements for each Operation type in Mantle Transactions and of Ledger Transaction. This detailed examination allowed us to determine precise gas amounts for each Operation based on the actual computational resources consumed.
The gas constants we established are strategically divided between permanent storage, ephemeral data store on the DA layer and execution components, directly proportional to their respective resource utilization within Mantle Transactions. This separation ensures that gas costs accurately reflect the true computational burden of different operations. Moreover, gas can also be adjusted arbitrarily to incentivize or disincentivize the usage of certain Operations compared to others.
Our methodology involved measuring execution complexity and defining how gas is determined for each Gas Market. This is critical for proper network operation as it directly impacts transaction prioritization and network economics.
Permanent Storage is paid directly for the entire signed Mantle Transaction. The Permanent Storage Gas price is included in the Mantle Transaction structure and is used to determine the Permanent Storage fee. 1 Permanent Storage Gas corresponds to 1 byte.
permanent_storage_fee = len(encode(tx_signed)) * permanent_storage_gas_price
Ephemeral storage is a unique market exclusive to Blobs. For this reason, the DA Storage Gas price is included in the Blob Operation structure and is used to determine the DA Storage fee. 1 DA Storage Gas corresponds to 1 byte.
da_storage_fee = blob_size * DA_storage_gas_price
Execution is a third general market that represent how costly an operation or a Ledger Transaction is to execute. This cost can be fixed or variable based on the content of the Operation / Transaction. The Execution Gas price is contained in the Mantle Transaction structure and each Operation or Ledger Transaction define its execution gas amount. 1 Execution Gas corresponds to 1,000 CPU cycles.