# Smart Contract
# Overview
Smart contract is a programmable blockchain account, that is, under an account that stores a piece of code in the blockchain, when this account receives a transaction, it will calculate according to the built-in code and update the calculation results to blockchain database of this account.
# Contract Type
To ensure both security and flexibility, TOP Network provides two types of smart contracts: platform smart contract and application level smart contract.
# Platform Smart Contract
Platform smart contacts are deployed on the main-chain, and are used for scenarios involving asset transfer, elections, and on-chain governance. These contracts are written in a stack-based non-Turing complete scripting language to ensure security and enforceability. Although platform contracts are not Turing complete, they can call built-in Turing complete core functions executed by the Core VM which provides flexibility.
The functions provided by the TOP Network platform contract are node registration, node voting, node access, node election, and chain governance.
| Platform Contract | Deployment Location | Contract Account Address | Description | Contract Name | Triggered By The Clock |
|---|---|---|---|---|---|
| Election Related Contract | Beacon | T2000138JQPo5TcurZsVLFUMd5vHJRBLenLWjLhk6@0 T2000138Kc9WynduqxJvX3VCU7XjHCR9YyKuBL1fx@0 | Beacon elect Beacon group contract. | beacon_election_contract zone_beacon_election_contract | Y |
| T2000138NpRxYCFQxMHvedTxRpgkb8B7oHt235N2W@0 | Beacon elect edge group contract. | edge_election_contract | Y | ||
| T2000138NXb36GkofBUMqxCAZqdERi63htDVC8Yzt@0 | Beacon elect archive group contract. | archive_election_contract | Y | ||
| T2000138CQwyzFxbWZ59mNjkq3eZ3eH41t7b5midm@0 T200024uCQ5Di2vZmPURNYVUuvWm5p7EaFQrRLs76@2 | "@0"Beacon candidate pool contract, including all candidate nodes and nodes have been elected as edge, archive and Beacon. The "@2" candidate pool contract stores the credible height of the @0 candidate pool. | beacon_candidate_contract zone_beacon_candidate_contract | Y | ||
| T200024uHxGKRST3hk5tKFjVpuQbGNDihMJR6qeeQ@2 | Beacon elect auditor/validator group contract. | zone_beacon_election_contract | Y | ||
| T200024uN3e6AujFyvDXY4h5t6or3DgKpu5rTKELD@2 | Shard association relationship contract. | cluster_shard_contract | N | ||
| On-chain Governance Contract | T2000138Ao4jjYtrXoNwfzb6gdpD2XNBpqUv46p8B@0 | On-chain governance contract. | government_contract | N | |
| Registration Contract | T2000138NZjvNJjRNG5iEqVKydpqAqoeNjBuFmNbj@0 | Miner registration contract. | miner_register_contract | N | |
| T200024uAt8Na2U1GUtWSHXJSqaJJBXunUX9WU9kB@0 | Process the workload data collected by shard, such as calculating individual node rewards. | zone_workload_contract | Y | ||
| T200024uPV1k6XjTm9No5yB2mxBPK9o2XqJKyhDUn@0 | Zone voting aggregates contracts. | zone_votes_contract | N | ||
| T200024uDhihoPJ24LQL4znxrugPM4eWk8rY42ceS@1 | Process the slash data collected by shard, such as calculating individual node slash. | zone_block_signing_rate_contract | Y | ||
| Reward Issue Contract | T200024uV5yB1ZCnXe7SbViA86ufhouFjpDKNRd3X@0 | Issue TOP Token as a reward pool. | token_issue_and_reward_contract | N | |
| Validator Network | T20000MFGB3gFWSsMfEo9LrC7JEaj1gJTXaYfXny | Shard workload statistics contract. | table_workload_contract | Y | |
| T20000ML7oBZbitBCcXhrJwqBhha2MUimd6SM9Z6 | Shard slash statistics. | table_block_signing_rate_contract | Y | ||
| T20000MTotTKfAJRxrfvEwEJvtgCqzH9GkpMmAUg | Shard reward claiming. | table_reward_contract | |||
| T20000MVfDLsBKVcy1wMp4CoEHWxUeBEAVBL9ZEa | Vote on miner. | table_vote_contract | N |