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Basic blockchain interop

The following describes basic blockchain interop function of SDK and defines relevant data structure.

Please use the following methods to initialize OntSDK use case before luanching JAVA SDK.

OntSdk ontSdk = OntSdk.getInstance();
ontSdk.setRpcConnection(url);
//ontSdk.setRestfulConnection（url）

Note: setRestfulConnection indicates that the connection is established using the restful interface, and setRpcConnection indicates that the connection is established using the rpc interface.

get the current block height

int height = ontSdk.getConnectMgr().getBlockHeight();

get block

Block block = ontSdk.getConnectMgr().getBlock(9757);

get blockchain node count

System.out.println(ontSdk.getConnectMgr().getNodeCount());

get block time

System.out.println(ontSdk.getConnectMgr().getGenerateBlockTime());

get blockchain-based transaction

String info = ontSdk.getConnectMgr().getTransaction(hash);
System.out.println(info);

get InvokeTransaction

InvokeCodeTransaction t = (InvokeCodeTransaction) ontSdk.getConnectMgr().getRawTransaction(hash);
System.out.println(t);

Data structure

Block

Field Type Description
version int version
prevBlockHash UInt256 scripthash of the previous block
transactionsRoot UInt256 merkel root of all the transactions in the block
blockRoot UInt256 block root
timestamp int block time stamp, unix time stamp
height int block height
consensusData long consensus data
nextBookKeeper UInt160 bookkeeping contract scripthash of the next block
sigData array signature
bookKeepers array bookkeepers
hash UInt256 hash value of the block
transactions Transaction[] transaction list in the block

Transaction

Field Type Description
version int version
txType TransactionType transaction type
nonce int random number
attributes TransactionAttribute[] transaction attribute list
fee Fee[] transaction fee list
networkFee long network fee
sigs Sign[] signature array
payload Payload payload

TransactionType

Value Type Description
208 int smart contract deployment
209 int smart contract invocation

签名字段

Field Type Description
pubKeys array public key array
M int M
sigData array signature value array

Fee

Field Type Description
amount long amount
payer UInt160 payer

TransactionAttribute

Field Type Description
usage TransactionAttributeUsage usage
data byte[] attribute value

TransactionAttributeUsage

Value Type Description
0 int Nonce
32 int Script
129 int DescriptionUrl
144 int Description