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|**Language**| Rust (safe, statically typed) with ink! macros for higher-level abstractions | Rust (no macros or framework) | Solidity (purpose-built for smart contracts) |
187
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|**Safety Model**| Rust guarantees (ownership, no nulls, memory safety, …) | Rust safety, but high bug risk due to DIY framework (e.g. for storage interactions) | Manual safety patterns; reentrancy common |
|**Documentation**| Extensive, verbose docs on https://use.ink/docs/v6, crate-level docs on e.g. https://docs.rs/ink_env/6.0.0-beta.1/ink_env/| None | Widely available |
191
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|**Polkadot SDK Integration**| Native support for typical `polkadot-sdk` types (`Balance`, `AccountId`, `VersionedXcm`, etc.) | None | None |
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|**Developer Ergonomics**| High: macros for storage, events, traits, testing | Very low: everything must be implemented manually | Extensive tooling & IDE support |
193
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|**Testing Environments**| Elaborate End-to-End testing framework | Must implement your own test harness | Foundry/Hardhat; very mature |
194
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|**Contract Model**| Function-based message/constructor model | No model provided; must implement dispatch & ABI | Function-based ABI, msg.sender model |
|**Storage Handling**|[`ink::storage`](https://docs.rs/ink_storage/6.0.0-beta.1/ink_storage/), `[`Mapping`](../datastructures/mapping/)`, derive macros for layout and codecs | Manual storage layout + serialization | Solidity storage keywords & slot model |
197
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|**ABI / Metadata**| Supports ink! metadata (SCALE-based) + Solidity ABI | Fully manual ABI definitions | Native ABI; industry standard |
198
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|**Cross-Contract Calls**| Rust traits as type-safe interfaces for calling Solidity or ink! contracts | Manual SCALE (or other) encoding/decoding, not type-safe | Built into EVM |
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|**Contract Verification**| Supported through ink! metadata and tooling; verifiable via Docker container | No support, must build verification tooling manually | Etherscan-style source verification |
200
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|**Zero Knowledge**| Can integrate with Polkadot-native ZK primitives at the Rust level ([example](https://github.com/use-ink/ink-examples/tree/main/zk-cross-contract-calls-solidity-verifiers)) | Possible, but fully manual | Growing zkEVM ecosystem |
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|**Productivity**| High | Highest flexibility, lowest productivity | High |
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|**Recommended Use Case**| Polkadot smart contracts | Highly efficient low-level contracts (e.g. for isolated business logic parts) | EVM-chain smart contracts, L1/L2 ecosystems |
|**Language**| Rust (safe, statically typed) with ink! macros for higher-level abstractions | Rust (no macros or framework) | Solidity (purpose-built for smart contracts) |
187
+
|**Safety Model**| Rust guarantees (ownership, no nulls, memory safety, …) | Rust safety, but high bug risk due to DIY framework (e.g. for storage interactions) | Manual safety patterns; reentrancy common |
|**Documentation**| Extensive, verbose docs on [use.ink/docs](https://use.ink/docs), crate-level docs for all crates ([`ink_env`](https://docs.rs/ink_env/6.0.0-beta.1/ink_env/), [`ink_storage`](https://docs.rs/ink_env/6.0.0-beta.1/ink_storage/), …)| None | Widely available |
191
+
|**Polkadot SDK Integration**| Native support for typical `polkadot-sdk` types (`Balance`, `AccountId`, `VersionedXcm`, etc.) | None | None |
192
+
|**Developer Ergonomics**| High: macros for storage, events, traits, testing | Very low: everything must be implemented manually | Extensive tooling & IDE support |
193
+
|**Testing Environments**| Elaborate End-to-End testing framework | Must implement your own test harness | Foundry/Hardhat; very mature |
194
+
|**Contract Model**| Function-based message/constructor model | No model provided; must implement dispatch & ABI | Function-based ABI, msg.sender model |
|**Storage Handling**|[`ink::storage`](https://docs.rs/ink_storage/6.0.0-beta.1/ink_storage/), [`Mapping`](../datastructures/mapping/)`, derive macros for layout and codecs| Manual storage layout + serialization | Solidity storage keywords & slot model |
197
+
|**ABI / Metadata**| Supports ink! metadata (SCALE-based) + Solidity ABI | Fully manual ABI definitions | Native ABI; industry standard |
198
+
|**Cross-Contract Calls**| Rust traits as type-safe interfaces for calling Solidity or ink! contracts | Manual SCALE (or other) encoding/decoding, not type-safe | Built into EVM |
199
+
|**Contract Verification**| Supported through ink! metadata and tooling; verifiable via Docker container | No support, must build verification tooling manually | Etherscan-style source verification |
200
+
|**Zero Knowledge**| Can integrate with Polkadot-native ZK primitives at the Rust level ([example](https://github.com/use-ink/ink-examples/tree/main/zk-cross-contract-calls-solidity-verifiers)) | Possible, but fully manual | Growing zkEVM ecosystem |
201
+
|**Productivity**| High | Highest flexibility, lowest productivity | High |
202
+
|**Recommended Use Case**| Polkadot smart contracts | Highly efficient low-level contracts (e.g. for isolated business logic parts) | EVM-chain smart contracts, L1/L2 ecosystems |
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