Smart Contracts

4 min

turing complete signum is shipped with smart contracts implemented as automated transactions (at) this system, developed initially by http //ciyam org/at/at html , is turing complete and has infinite use cases signum was the first platform to run turing complete smart contracts on a public blockchain the second unique feature of signum's smart contracts is that they can be programmed to self execute most of today's available smart contracts only react to the transactions they receive signum's self running smart contracts provide endless potential for new applications with the introduction of https //github com/signum network/sips/blob/master/sip/sip 39 md smart contracts can create, mint and transfer docid\ xl hjdf6ox3tgebp y ym by contract code smart contract specifications if a smart contract gets deployed to the signum chain, the following parameters apply parameter value maximum pages for code & data 40 page size 256 bytes cost per page 0,01 signa maximum steps per block 1,000,000 step fee 0 001 signa the smart contract is stored in bytecode on the chain, but the programming will happen in java via —no extra code language to learn just code in java smart contract creation the smart contract gets uploaded to the signum chain with the at creation transaction type example smart contract creation transaction { "type" 22, "subtype" 0, "timestamp" 240957605, "deadline" 1440, "senderpublickey" "34a7ca8bbded4e3f24c60ecb655f9235ac1b12d97aea698c554df8bf1d950f2d", "amountnqt" "0", "feenqt" "147000000", "signature" "317ec48d2a8b148f85d11e44edec062e96bbeee72583be85c466382aab78b60cee91352efa7ba9a1c4392a7b17a49497394d4446a3864e88224c4313b04f2bb5", "signaturehash" "3e7fac2e1019ed475a0518f33fa0fde8b6ff19f3fc8eb42a6d614fcf03893d32", "fullhash" "424769be0294a47ebc502e49a8cb41b599b93fadbef9f7d3915df7091efd97a5", "transaction" "9125581484464883522", "attachment" { "version automatedtransactionscreation" 1, "name" "signumart2", "description" "signumart2, created with smartj", 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"sender" "12237344381764262326", "senderrs" "ts wqfq w64l ht3p c9ynm", "height" 409545, "version" 2, "ecblockid" "2202141244546406042", "ecblockheight" 409533, "cashbackid" "8952122635653861124", "block" "16653680439918419989", "confirmations" 629, "blocktimestamp" 240957726, "requestprocessingtime" 0 } with the creation of a smart contract, the machinedata and machinecode are saved to the signum blockchain { "at" "9125581484464883522", "machinedata" 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"requestprocessingtime" 1 } green contracts with the introduction of the https //github com/signum network/sips/blob/master/sip/sip 30 md the machinecode can be loaded from an existing contract by reference over the fullhash of the reference transaction this has two significant advantages firstly, it can be ensured that the smart contract is using the same logic as copied from the parent, and secondly, no extra space is needed on the chain to store the code a second time or x times, as the smart contract is referencing to the code in the reference transaction