CHANGELOG.md

Change Log

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

[Unreleased]

Fixed

• 860: Fixed missing fuzzing coverage report in CI.

Breaking

• 863: Changed StorageRead::read to load a serialized value starting from a offset. The function returns an optional value equal to the number of bytes read when defined, or none if the offset specified in input is outside the boundaries of the serialized value read.

[Version 0.58.2]

Fixed

• #854: Fixed a bug where LDC mode 2 padding bytes would be copied from memory instead of using zeroes.

[Version 0.58.1]

Fixed

• #852: Fixed incorrect predicate estimation when max predicate gas is less than max tx gas.

[Version 0.58.0]

Added

• #849: Add a new mode 2 to the LDC that allows to use the memory as a source for code.
• #848: Allow usage of the blob opcode BSIZ, BLDD, and LDC with mode 1 in the predicates.
• #838: Implemented AsRef<[u8]> and TryFrom<&[u8]> for DA compression types: ScriptCode, PredicateCode, RegistryKey.
• #820: Add fuzzing in CI with ClusterFuzzLite.

Removed

Breaking

• #848: All estimation and verification of predicate functionality is reworked and now requires the instance of the storage with predicates.
• #843: Remove serde feature from the fuel-tx crate. It is default behaviour now if you enable alloc feature.
• #766: Use correct gas price when validating native signatures

Changed

Breaking

• #829: Updated add_random_fee_input() to accept an rng for true randomization. Introduced add_fee_input() to retain the previous behavior of add_random_fee_input().
• #845: Removed Default implementation of SecretKey.
• #844: WDCM and WQCM reset $of and $err.

[Version 0.57.1]

Fixed

• #835: Fixing WASM-NPM packaging and publishing

[Version 0.57.0]

Added

• #670: Add DA compression functionality to Transaction and any types within
• #733: Add LibAFL based fuzzer and update secp256k1 version to 0.29.1.
• #825: Avoid leaking partially allocated memory when array deserialization fails

Changed

• #824: Use self instead of &self during decompression.
• #823: Returned the old behaviour of the json serialization for policies.

Breaking

• #826: Skip the panic reason from canonical serialization of the panic receipt.
• #821: Added block_transaction_size_limit to ConsensusParameters. It adds a new ConensusParametersV2 as a variant of the ConsensusParameters.
• #670: The predicate field of fuel_tx::input::Coin is now a wrapper struct PredicateCode.

Fixed

• #822: Return recipient as an owner for the message inputs.

[Version 0.56.0]

Added

• #796: Added implementation of the MerkleRootStorage for references.

Changed

• #806: Update MSRV to 1.79.0.

Breaking

• #780: Added Blob transaction, and BSIZ and BLDD instructions. Also allows LDC to load blobs.
• #795: Fixed ed19 instruction to take variable length message instead of a fixed-length one. Changed the gas cost to be DependentCost.

[Version 0.55.0]

Added

• #781: Added base_asset_id to checked metadata.

Changed

• #784: Avoid storage lookups for side nodes in the SMT.
• #787: Fixed charge functions to profile cost before charging.

Breaking

• #783: Remove unnecessary look up for old values by adding new methods to the StorageMutate trait. The old insert and remove are now replace and take. The new insert and remove don't return a value.
• #783: Renamed methods of StorageWrite trait from write, replace, take to write_bytes, replace_bytes, take_bytes.
• #788: Fix truncating sp to MEM_SIZE in grow_stack, and allow empty writes to zero-length ranges at $hp.

Fixed

Breaking

• #789: Avoid conversion into usize type and use u32 or u64 instead. The change is breaking since could return other errors for 32-bit systems.
• #786: Fixed the CCP opcode to charge for the length from the input arguments.
• #785: Require ContractCreated output in the Create transaction. The TransactionBuilder<Create> has a add_contract_created method to simplify the creation of the ContractCreated output for tests.

[Version 0.54.1]

Changed

• #776: Charge for max length in LDC opcode.

[Version 0.54.0]

Added

• #770: Cache contract inputs in the VM.

Changed

• #768: Charge for LDC opcode before loading the contract into memory.

• #771: Take into account spent gas during synchronous predicates estimation.

Breaking

• #769: Use DependentCost for CFE and CFEI opcodes.
• #767: Fixed no zeroing malleable fields for Create transaction.
• #765: Corrected the gas units for WDOP and WQOP.

Removed

• #772: Removed redundant self.receipts.root() call.

[Version 0.53.0]

Added

• #751: Improve test coverage.

Changed

• #753: Fix an ownership check bug in CCP instruction.

[Version 0.52.0]

Changed

Breaking

• #748: Make VmMemoryPool::get_new async.
• #747: Use DependentCost for aloc opcode. The cost of the aloc opcode is now dependent on the size of the allocation.

[Version 0.51.0]

Added

• #732: Adds reset method to VM memory.

Breaking

• #732: Makes the VM generic over the memory type, allowing reuse of relatively expensive-to-allocate VM memories through VmMemoryPool. Functions and traits which require VM initalization such as estimate_predicates now take either the memory or VmMemoryPool as an argument. The Interpterter::eq method now only compares accessible memory regions. Memory was renamed into MemoryInstance and Memory is a trait now.

Changed

Breaking

• #743: Zeroes $flag on CALL, so that contracts can assume clean $flag state.
• #737: Panic on instructions with non-zero reserved part.

[Version 0.50.0]

Changed

• #725: Adds more clippy lints to catch possible integer overflow and casting bugs on compile time.
• #729: Adds more clippy lints to fuel-merkle to catch possible integer overflow and casting bugs on compile time. It also does some internal refactoring.

Added

Breaking

• #725: UtxoId::from_str now rejects inputs with multiple 0x prefixes. Many ::from_str implementations also reject extra data in the end of the input, instead of silently ignoring it. UtxoId::from_str allows a single : between the fields. Unused GasUnit struct removed.
• #726: Removed code related to Binary Merkle Sum Trees (BMSTs). The BMST is deprecated and not used in production environments.
• #729: Removed default implementation of Node::key_size_bits, implementors must now define it themselves. Also some helper traits have been merged together, or their types changed.

Fixed

Breaking

• #736: LDC instruction now works in internal contexts as well. Call frames use code size padded to word alignment.

[Version 0.49.0]

Added

• #721: Added additional logic to the BMT proof verification algorithm to check the length of the provided proof set against the index provided in the proof.

Breaking

• #719: Fix overflow in LDC instruction when contract size with padding would overflow.

• #715: The Interpreter supports the processing of the Upload transaction. The change affects InterpreterStorage, adding StorageMutate<UploadedBytes> constrain.

• #714: The change adds a new Upload transaction that allows uploading huge byte code on chain subsection by subsection. This transaction is chargeable and is twice as expensive as the Create transaction. Anyone can submit this transaction.

• #712: The Interpreter supports the processing of the Upgrade transaction. The change affects InterpreterStorage, adding 5 new methods that must be implemented.

• #707: The change adds a new Upgrade transaction that allows upgrading either consensus parameters or state transition function used by the network to produce future blocks. The purpose of the upgrade is defined by the Upgrade Purpose type:

  pub enum UpgradePurpose {
      /// The upgrade is performed to change the consensus parameters.
      ConsensusParameters {
          /// The index of the witness in the [`Witnesses`] field that contains
          /// the serialized consensus parameters.
          witness_index: u16,
          /// The hash of the serialized consensus parameters.
          /// Since the serialized consensus parameters live inside witnesses(malleable
          /// data), any party can override them. The `checksum` is used to verify that the
          /// data was not modified.
          checksum: Bytes32,
      },
      /// The upgrade is performed to change the state transition function.
      StateTransition {
          /// The Merkle root of the new bytecode of the state transition function.
          /// The bytecode must be present on the blockchain(should be known by the
          /// network) at the moment of inclusion of this transaction.
          root: Bytes32,
      },
  }

  The Upgrade transaction is chargeable, and the sender should pay for it. Transaction inputs should contain only base assets.

  Only the privileged address can upgrade the network. The privileged address can be either a real account or a predicate.

  Since serialized consensus parameters are small(< 2kb), they can be part of the upgrade transaction and live inside of witness data. The bytecode of the blockchain state transition function is huge ~1.6MB(relative to consensus parameters), and it is impossible to fit it into one transaction. So when we perform the upgrade of the state transition function, it should already be available on the blockchain. The transaction to actually upload the bytecode(Upload transaction) will implemented in the FuelLabs/fuel-core#1754.

Changed

• #707: Used the same pattern everywhere in the codebase:

               Self::Script(tx) => tx.encode_static(buffer),
               Self::Create(tx) => tx.encode_static(buffer),
               Self::Mint(tx) => tx.encode_static(buffer),
               Self::Upgrade(tx) => tx.encode_static(buffer),

  Instead of:

               Transaction::Script(script) => script.encode_static(buffer),
               Transaction::Create(create) => create.encode_static(buffer),
               Transaction::Mint(mint) => mint.encode_static(buffer),
               Transaction::Upgrade(upgrade) => upgrade.encode_static(buffer),

Breaking

• #714: Added max_bytecode_subsections field to the TxParameters to limit the number of subsections that can be uploaded.

• #707: Side small breaking for tests changes from the Upgrade transaction:

  • Moved fuel-tx-test-helpers logic into the fuel_tx::test_helpers module.
  • Added a new rule for Create transaction: all inputs should use base asset otherwise it returns TransactionInputContainsNonBaseAssetId error.
  • Renamed some errors because now they are used for several transactions(Upgrade uses some errors from Create and some from Script transactions):
    • TransactionScriptOutputContractCreated -> TransactionOutputContainsContractCreated.
    • TransactionCreateOutputContract -> TransactionOutputContainsContract.
    • TransactionCreateOutputVariable -> TransactionOutputContainsVariable.
    • TransactionCreateOutputChangeNotBaseAsset -> TransactionChangeChangeUsesNotBaseAsset.
    • TransactionCreateInputContract -> TransactionInputContainsContract.
    • TransactionCreateMessageData -> TransactionInputContainsMessageData.
  • The combination of serde and postcard is used to serialize and deserialize ConsensusParameters during the upgrade. This means the protocol and state transition function requires the serde feature by default for ConsensusParameters and fuel-types.

• #697: Changed the VM to internally use separate buffers for the stack and the heap to improve startup time. After this change, memory that was never part of the stack or the heap cannot be accessed, even for reading. Also, even if the whole memory is allocated, accesses spanning from the stack to the heap are not allowed. This PR also fixes a bug that required one-byte gap between the stack and the heap. Multiple errors have been changed to be more sensible ones, and sometimes the order of which error is returned has changed. ALOC opcode now zeroes the newly allocated memory.

[Version 0.48.0]

Added

• #705: Added privileged_address to the ConsensusParameters for permissioned operations(like upgrade of the network).
• #648: Added support for generating proofs for Sparse Merkle Trees (SMTs) and proof verification. Proofs can be used to attest to the inclusion or exclusion of data from the set.

Changed

Breaking

• #709: Removed bytecode_length from the Create transaction.
• #706: Unified Create and Script logic via ChargeableTransaction. The change is breaking because affects JSON serialization and deserialization. Now Script and Create transactions have body fields that include unique transactions.
• #703: Reshuffled fields Script and Create transactions to unify part used by all chargeable transactions. It breaks the serialization and deserialization and requires adoption on the SDK side.
• #708: Hidden Default params under the "test-helper" feature to avoid accidental use in production code. It is a huge breaking change for any code that has used them before in production, and instead, it should be fetched from the network. In the case of tests simply use the "test-helper" feature in your [dev-dependencies] section.
• #702: Wrapped FeeParameters, PredicateParameters, TxParameters, ScriptParameters and ContractParameters into an enum to support versioning.
• #701: Wrapped ConsensusParameters and GasCosts into an enum to support versioning. Moved block_gas_limit from fuel_core_chain_config::ChainConfig to ConsensusPataremeters. Reduced default MAX_SIZE to be 110kb and MAX_CONTRACT_SIZE to be 100kb.
• #692: Add GTF getters for tx size and address.
• #698: Store input, output and witness limits to u16, while keeping the values limited to 255.

[Version 0.47.1]

Added

• #689: Re-add fields to the checked tx Metadata for min and max gas.
• #689: Add test helpers and additional getters.

[Version 0.47.0]

Added

• #686: Implement serde for InterpreterError.

Changed

Breaking

• #685: The MaxFee is a mandatory policy to set. The MaxFee policy is used to check that the transaction is valid. Added a new stage for the Checked transaction - Ready. This type can be constructed with the gas_price before being transacted by the Interpreter.
• #671: Support dynamically sized values in the ContractsState table by using a vector data type (Vec<u8>).
• #682: Include Tip policy in fee calculation
• #683: Simplify InterpreterStorage by removing dependency on MerkleRootStorage and removing merkle_ prefix from method names.
• #678: Zero malleable fields before execution. Remove some now-obsolete GTF getters. Don't update tx.receiptsRoot after pushing receipts, and do it after execution instead.
• #672: Remove GasPrice policy
• #672: Add gas_price field to transaction execution
• #684: Remove maturity field from Input coin types. Also remove related GTF getter.
• #675: Add GTF access for asset_id and to fields for Change outputs.

[Version 0.46.0]

Changed

Breaking

• #679: Require less restricted constraint on MerkleRootStorage trait. Now it requires StorageInspect instead of the StorageMutate.
• #673: Removed ContractsInfo table. Contract salts and roots are no longer stored in on-chain data.
• #673: Opcode CROO now calculates the given contract's root on demand. CROO has therefore been changed to a DependentCost gas cost.

Changed

• #672: Add Tip policy

[Version 0.45.0]

Changed

Breaking

• #668: Remove non_exhaustive from versionable types for security reasons

[Version 0.44.0]

Changed

• #653: ECAL opcode handler can now hold internal state.
• #657: Add debugger methods to remove or replace all breakpoints at once.

Breaking

• #654: Make public types versionable by making non-exhaustive.
• #658: Make key!-generated types like Address, AssetId, ContractId and Bytes32 consume one less byte when serialized with a binary serde serializer like postcard.

[Version 0.43.2]

Changed

• #645: Add wasm support for fuel-tx crate.

[Version 0.43.1]

Fixed

• #643: Fixed json deserialization of array fuel types from the file.

[Version 0.43.0]

Changed

Breaking

• #640: Update VM initialization cost to dependent cost; this is required because the time it takes to initialize the VM depends on the size of the transaction.

[Version 0.42.1]

Changed

Breaking

• #637: Charge for the actual size of the contract in ccp opcode.

[Version 0.42.0]

Changed

Breaking

• #676 Add gas_price to Mint transaction

• #629: Charge the user for VM initialization.

• #628: Renamed transaction::CheckError to transaction::ValidityError. Created a new checked_transaction::CheckError that combines ValidityError and PredicateVerificationFailed errors into one. It allows the return of the PredicateVerificationFailed to the end user instead of losing the reason why predicate verification failed.

• #625: Use ArithmeticError only for arithmetic operations, and introduce new errors like BalanceOverflow for others. Whenever an error is internally caused by a type conversion to usize, so that an overflowing value wouldn't map to a valid index anyway, return the missing item error instead.

• #623: Added support for transaction policies. The Script and Create transactions received a new field, policies. Policies allow the addition of some limits to the transaction to protect the user or specify some details regarding execution. This change makes the GasPrice and Maturity fields optional, allowing to save space in the future. Also, this will enable us to support multidimensional prices later. GasLimit was renamed to ScriptGasLimit.

  Along with this change, we introduced two new policies:

  • WitnessLimit - allows the limitation of the maximum size of witnesses in bytes for the contract. Because of the changes in the gas calculation model(the blockchain also charges the user for the witness data), the user should protect himself from the block producer or third parties blowing up witness data and draining the user's funds.
  • MaxFee - allows the upper bound for the maximum fee that users agree to pay for the transaction.

  This change brings the following modification to the gas model:

  • The ScriptGasLimit only limits script execution. Previously, the ScriptGasLimit also limited the predicate execution time, instead predicate gas is now directly included into min_fee. So, it is not possible to use the ScriptGasLimit for transaction cost limitations. A new MaxFee policy is a way to do that. The GasLimit field was removed from the Create transaction because it only relates to the script execution (which the Create transaction doesn't have).
  • The blockchain charges the user for the size of witness data (before it was free). There is no separate price for the storage, so it uses gas to charge the user. This change affects min_gas and min_fee calculation.
  • A new policy called WitnessLimit also impacts the max_gas and max_fee calculation in addition to ScriptGasLimit(in the case of Create transaction only WitnessLimit affects the max_gas and max_fee).
  • The minimal gas also charges the user for transaction ID calculation.

  The change has the following modification to the transaction layout:

  • The Create transaction doesn't have the ScriptGasLimit field anymore. Because the Create transaction doesn't have any script to execute
  • The Create and Script transactions don't have explicit maturity and gas_price fields. Instead, these fields can be set via a new policies field.
  • The Create and Script transactions have a new policies field with a unique canonical serialization and deserialization for optimal space consumption.

  Other breaking changes caused by the change:

  • Each transaction requires setting the GasPrice policy.
  • Previously, ScriptGasLimit should be less than the MAX_GAS_PER_TX constant. After removing this field from the Create transaction, it is impossible to require it. Instead, it requires that max_gas <= MAX_GAS_PER_TX for any transaction. Consequently, any Script transaction that uses MAX_GAS_PER_TX as a ScriptGasLimit will always fail because of a new rule. Setting the estimated gas usage instead solves the problem.
  • If the max_fee > policies.max_fee, then transaction will be rejected.
  • If the witnessses_size > policies.witness_limit, then transaction will be rejected.
  • GTF opcode changed its hardcoded constants for fields. It should be updated according to the values from the specification on the Sway side.

• #633: Limit receipt count to u16::MAX.

• #634: Charge for storage per new byte written. Write opcodes now return the number of new storage slots created, instead of just a boolean on whether the value existed before.

Fixed

• #627: Added removal of obsolete SMT nodes along the path during update and delete operations.

[Version 0.41.0]

Breaking

• #622: Divide DependentCost into "light" and "heavy" operations: Light operations consume 0 < x < 1 gas per unit, while heavy operations consume x gas per unit. This distinction provides more precision when calculating dependent costs.

[Version 0.40.0]

Added

• #607: Added ECAL instruction support.

Changed

• #612: Reduced the memory consumption in all places where we calculate BMT root.
• #615: Made ReceiptsCtx of the VM modifiable with test-helpers feature.

Breaking

• #618: Transaction fees for Create now include the cost of metadata calculations, including: contract root calculation, state root calculation, and contract id calculation.
• #613: Transaction fees now include the cost of signature verification for each input. For signed inputs, the cost of an EC recovery is charged. For predicate inputs, the cost of a BMT root of bytecode is charged.
• #607: The Interpreter expects the third generic argument during type definition that specifies the implementer of the EcalHandler trait for ecal opcode.
• #609: Checked transactions (Create, Script, and Mint) now enforce a maximum size. The maximum size is specified by MAX_TRANSACTION_SIZE in the transaction parameters, under consensus parameters. Checking a transaction above this size raises CheckError::TransactionSizeLimitExceeded.
• #617: Makes memory outside $is..$ssp range not executable. Separates ErrorFlag into InvalidFlags, MemoryNotExecutable and InvalidInstruction. Fixes related tests.
• #619: Avoid possible truncation of higher bits. It may invalidate the code that truncated higher bits causing different behavior on 32-bit vs. 64-bit systems.

[Version 0.39.0]

Added

• #603: Added MerkleRootCalculatorfor efficient in-memory Merkle root calculation.
• #603: Added Serialization and Deserialization support to MerkleRootCalculator.

Changed

• #595: Removed wee_alloc dependency from fuel-asm. It now uses the builtin allocator on web targets as well.

Breaking

• #598: Update cost model for ldc opcode to take into account contract size.
• #604: Removed ChainId from PredicateId calculation. It changes the generated address of the predicates and may break tests or logic that uses hard-coded predicate IDs.
• #594: Add new predicate input validation tests. Also improves error propagation so that predicate error message better reflects the reason for invalidity.
• #596: Remove core::ops::{Add, Sub} impls from BlockHeight. Use succ and pred to access adjacent blocks, or perform arithmetic directly on the wrapped integer instead.
• #593: Reworked Mint transaction to work with Input::Contract and Output::Contract instead of Output::Coin. It allows account-based fee collection for the block producer.

[Version 0.38.0]

Added

• #586: Added default_asset method to the ContractIdExt trait implementation, to mirror the default method on AssetId in the Sway std lib.

Changed

Breaking

• #578: Support no_std environments for fuel-crypto, falling back to a pure-Rust crypto implementation.
• #582: Make fuel-vm and fuel-tx crates compatible with no_std + alloc. This includes reworking all error handling that used std::io::Error, replacing some std::collection::{HashMap, HashSet} with hashbrown::{HashMap, HashSet} and many changes to feature-gating of APIs.
• #587: Replace thiserror dependency with derive_more, so that core::fmt::Display is implemented without the std feature. Removes std::io::Error trait impls from the affected types.
• #588: Re-worked the size calculation of the canonical serialization/deserialization.
• #700: Add BASE_ASSET_ID to GM instruction.

Removed

• #588: Removed SerializedSize and SerializedFixedSize traits. Removed support for SIZE_NO_DYNAMIC and SIZE_STATIC. Removed enum attributes from derive macro for Serialize and Deserialize traits.

[Version 0.37.0]

Breaking

• #573: Added base_asset_id as a required field to FeeParameters. base_asset_id is used to supply the ID of the base asset.
• #554: Removed debug feature from the fuel-vm. The debugger is always available and becomes active after calling any set_* method.
• #537: Use dependent cost for k256, s256, mcpi, scwq, swwq opcodes. These opcodes charged inadequately low costs in comparison to the amount of work. This change should make all transactions that used these opcodes much more expensive than before.
• #533: Use custom serialization for fuel-types to allow no_std compilation.

[Version 0.36.1]

Changed

• #546: Improve debug formatting of instruction in panic receipts.

Fixed

• #574: Enforce fixed 32-byte input length for LHS and RHS inputs to the BMT's internal node sum.
• #547: Bump ed25519-dalek to 2.0.0 to deal with RustSec Advisory.

Breaking

• #524: Fix a crash in CCP instruction when overflowing contract bounds. Fix a bug in CCP where overflowing contract bounds in a different way would not actually copy the contract bytes, but just zeroes out the section. Fix a bug in LDC where it would revert the transaction when the contract bounds were exceeded, when it's just supposed to fill the rest of the bytes with zeroes.

[Version 0.36.0]

Changed

• #525: The $hp register is no longer restored to it's previous value when returning from a call, making it possible to return heap-allocated types from CALL.
• #535: Add better test coverage for TR and TRO.

Breaking

• #514: Add ChainId and GasCosts to ConsensusParameters. Break down ConsensusParameters into sub-structs to match usage. Change signatures of functions to ask for necessary fields only.
• #532: The TRO instruction now reverts when attempting to send zero coins to an output. Panic reason of this TransferZeroCoins, and TR was changed to use the same panic reason as well.

Fixed

• #511: Changes multiple panic reasons to be more accurate, and internally refactors instruction fetch logic to be less error-prone.

• #529 #534: Enforcing async WASM initialization for all NPM wrapper packages.

• #531: UtxoId::from_str and TxPointer::from_str no longer crash on invalid input with multibyte characters. Also adds clippy lints to prevent future issues.

Breaking

• #527: The balances are empty during predicate estimation/verification.

[Version 0.35.3]

Changed

• #542: Make the fuel-tx WASM compatible with serde feature enabled.

[Version 0.35.2]

Changed

Breaking

• #539: Rollbacked the change for the gas charging formula. Actualized the gas prices for opcodes.

[Version 0.35.1]

Added

• #499: The wasm_bindgen support of fuel-asm and fuel-types. Each new release also publish a typescript analog of the fuel-asm and fuel-types crates to the npm.

[Version 0.35.0]

The release mostly fixes funding during the audit and integration with the bridge. But the release also contains some new features like:

• Asynchronous predicate estimation/verification.
• Multi-asset support per contract.
• Support Secp256r1 signature recovery and Ed25519 verificaiton.

Added

• #486: Adds ed25519 signature verification and secp256r1 signature recovery to fuel-crypto, and corresponding opcodes ED19 and ECR1 to fuel-vm.

• #486: Adds PSHL, PSHH, POPH and POPL instructions, which allow cheap push and pop stack operations with multiple registers.

• #500: Introduced ParallelExecutor trait and made available async versions of verify and estimate predicates. Updated tests to test for both parallel and sequential execution. Fixed a bug in transaction/check_predicate_owners.

Breaking

• #506: Added new Mint and Burn variants to Receipt enum. It affects serialization and deserialization with new variants.

Changed

Breaking

• #506: The mint and burn opcodes accept a new $rB register. It is a sub-identifier used to generate an AssetId by this rule. This feature allows having multi-asset per one contract. It is a huge breaking change, and after this point, ContractId can't be equal to AssetId.

  The conversion like AssetId::from(*contract_id) is no longer valid. Instead, the ContractId implements the ContractIdExt trait:

  /// Trait extends the functionality of the `ContractId` type.
  pub trait ContractIdExt {
      /// Creates an `AssetId` from the `ContractId` and `sub_id`.
      fn asset_id(&self, sub_id: &Bytes32) -> AssetId;
  }

• #506: The mint and burn opcodes affect the receipts_root of the Script transaction.

Removed

Breaking

• #486: Removes apparently unused Keystore and Signer traits from fuel-crypto. Also renames ECR opcode to ECK1.

Fixed

• #500: Fixed a bug where MessageCoinPredicate wasn't checked for in check_predicate_owners.

Breaking

• #502: The algorithm used by the binary Merkle tree for generating Merkle proofs has been updated to remove the leaf data from the proof set. This change allows BMT proofs to conform to the format expected by the Solidity contracts used for verifying proofs.

• #503: Use correct amount of gas in call receipts when limited by cgas. Before this change, the Receipt::Call could show an incorrect value for the gas limit.

• #504: The CROO and CSIZ opcodes require the existence of corresponding ContractId in the transaction's inputs(the same behavior as for the CROO opcode).

• #504: The size of the contract was incorrectly padded. It affects the end of the call frame in the memory, making it not 8 bytes align. Also, it affects the cost of the contract call(in some cases, we charged less in some more).

• #504: The charging for DependentCost was done incorrectly, devaluing the dep_per_unit part. After the fixing of this, the execution should become much more expensive.

• #505: The data field of the Receipt is not part of the canonical serialization and deserialization anymore. The SDK should use the Receipt type instead of OpaqueReceipt. The Receipt.raw_payload will be removed for the fuel-core 0.20. The data field is optional now. The SDK should update serialization and deserialization for MessageOut, LogData, and ReturnData receipts.

• #505: The len field of the Receipt is not padded anymore and represents an initial value.

[Version 0.34.1]

Mainly new opcodes prices and small performance improvements in the BinaryMerkleTree.

Changed

• #492: Minor improvements to BMT internals, including a reduction in usage of Box, using expect(...) over unwrap(), and additional comments.

Breaking

• #493: The default GasCostsValues is updated according to the benches with fuel-core 0.19. It may break some unit tests that compare actual gas usage with expected.

[Version 0.34.0]

This release contains fixes for critical issues that we found before the audit. Mainly, these changes pertain to the Sparse Merkle Tree (SMT) and related code. The SMT API was extended to provide more flexibility and to allow users to select the most appropriate method for their performance needs. Where possible, sequential SMT updates were replaced with constructors that take in a complete data set.

Added

• #476: The fuel_vm::Call supports From<[u8; Self::LEN]> and Into<[u8; Self::LEN]>.

• #484: The sparse::in_memory::MerkleTree got new methods from_set, root_from_set, and nodes_from_set methods. These methods allow a more optimal way to build and calculate the SMT when you know all leaves. The Contract::initial_state_root is much faster now (by ~15 times).

Removed

• #478: The CheckedMemRange is replaced by the MemoryRange.

Changed

• #477: The PanicReason::UnknownPanicReason is 0x00. The PanicReason now implements From<u8> instead of TryFrom<u8> and can't return an error anymore.

• #478: The memcopy method is updated and returns MemoryWriteOverlap instead of MemoryOverflow.

Fixed

• #482: This PR address a security issue where updates to a Sparse Merkle Tree could deliberately overwrite existing leaves by setting the leaf key to the hash of an existing leaf or node. This is done by removing the insertion of the leaf using the leaf key.

• #484: Fixed bug with not-working CreateMetadata.

Breaking

• #473: CFS and CFSI were not validating that the new $sp value isn't below $ssp, allowing write access to non-owned memory. This is now fixed, and attempting to set an incorrect $sp value panics.

• #485: This PR addresses a security issue where the user may manipulate the structure of the Sparse Merkle Tree. SMT expects hashed storage key wrapped into a MerkleTreeKey structure. The change is breaking because it changes the state_root generated by the SMT and may change the ContractId if the Create transaction has non-empty StoargeSlots.

[Version 0.33.0]

The release contains a lot of breaking changes. Most of them are audit blockers and affect the protocol itself. Starting this release we plan to maintain the changelog file and describe all minor and major changes that make sense.

Added

Breaking

• #386: The coin and message inputs got a new field - predicate_gas_used. So it breaks the constructor API of these inputs.

  The value of this field is zero for non-predicate inputs, but for the predicates, it indicates the exact amount of gas used by the predicate to execute. If after the execution of the predicate remaining gas is not zero, then the predicate execution failed.

  This field is malleable but will be used by the VM, and each predicate should be estimated before performing the verification logic. The Transaction, Create, and Script types implement the EstimatePredicates for these purposes.

  /// Provides predicate estimation functionality for the transaction.
  pub trait EstimatePredicates: Sized {
      /// Estimates predicates of the transaction.
      fn estimate_predicates(&mut self, params: &ConsensusParameters, gas_costs: &GasCosts) -> Result<(), CheckError>;
  }

  During the creation of the Input, the best strategy is to use a default value like 0 and call the estimate_predicates method to actualize the predicate_gas_used after.

• #454: VM native array-backed types Address, AssetId, ContractId, Bytes4, Bytes8, Bytes20, Bytes32, Nonce, MessageId, Salt now use more compact representation instead of hex-encoded string when serialized using serde format that sets is_human_readable to false.

• #456: Added a new type - ChainId to represent the identifier of the chain. It is a wrapper around the u64, so any u64 can be converted into this type via .into() or ChainId::new(...).

• #459 Require witness index to be specified when adding an unsigned coin to a transaction. This allows for better reuse of witness data when using the transaction builder and helper methods to make transactions compact.

• #462: Adds a cache parameter to Input::check and Input::check_signature. This is used to avoid redundant signature recovery when multiple inputs share the same witness index.

Changed

• #458: Automatically sort storage slots for creation transactions.

Breaking

• #386: Several methods of the TransactionFee are renamed total -> max_fee and bytes -> min_fee. The TransactionFee::min_fee take into account the gas used by predicates.

• #450: The Merkle root of a contract's code is now calculated by partitioning the code into chunks of 16 KiB, instead of 8 bytes. If the last leaf is does not a full 16 KiB, it is padded with 0 up to the nearest multiple of 8 bytes. This affects the ContractId and PredicateId calculations, breaking all code that used hardcoded values.

• #456: The basic methods UniqueIdentifier::id, Signable::sign_inputs, and Input::predicate_owner use ChainId instead of the ConsensusParameters. It is a less strict requirement than before because you can get ChainId from ConsensusParameters.chain_id, and it makes the API cleaner. It affects all downstream functions that use listed methods.

• #463: Moves verification that the Output::ContractCreated output contains valid contract_id and state_root(the values from the Output match with calculated values from the bytecode, storage slots, and salt) from fuel-vm to fuel-tx. It means the end-user will receive this error earlier on the SDK side before dry_run instead of after.

Fixed

Breaking

• #457: Transactions got one more validity rule: Each Script or Create transaction requires at least one input coin or message to be spendable. It may break code/tests that previously didn't set any spendable inputs. Note: Message with non-empty data field is not spendable.

• #458: The storage slots with the same key inside the Create transaction are forbidden.