getConstants

Retrieves network constants including blockchain parameters, transaction types, currency types, hash algorithms, peer states, chain configurations, and API tags.

Endpoint

GET /nxt?requestType=getConstants

Parameters

None

Request Example

curl "http://localhost:22024/nxt?requestType=getConstants"

Response

{
  "accountPrefix": "SHAMWARI",
  "genesisBlockId": "12345678901234567890",
  "epochBeginning": 123456789,
  "maxBetaBlockPayloadLength": 123456,
  "maxNumberOfFxtTransactions": 123456,
  "maxNumberOfBetaTransaction": 123456,
  "maxArbitraryMessageLength": 160,
  "maxEncryptedMessageLength": 160,
  "maxPrunableMessageLength": 1280,
  "maxPrunableEncryptedMessageLength": 1280,
  "lastKnownBlock": {
    "id": "12345678901234567890",
    "height": 1000000
  },
  "leasingDelay": 1440,
  "transactionTypes": {},
  "transactionSubTypes": {},
  "currencyTypes": {
    "UNISSUABLE": 1,
    "ISSUABLE": 2,
    "EXCHANGABLE": 4,
    "CLAIMABLE": 8,
    "NON_TRADABLE": 16
  },
  "votingModels": {
    "NONE": 0,
    "TRANSACTION": 1,
    "ACCOUNT": 2,
    "CURRENCY": 3,
    "EXCLUSIVE_TRANSACTION": 4,
    "EXCLUSIVE_ACCOUNT": 5
  },
  "maxContractFileDataLength": 1024,
  "minBalanceModels": {
    "NONE": 0,
    "NATURAL": 1,
    "MIXED": 2
  },
  "hashAlgorithms": {
    "RIPEMD160": 0,
    "SHA256": 1,
    "SHA3": 5,
    "SKEIN256": 6,
    "SKEIN512": 7,
    "Keccak256": 8,
    "Keccak512": 9,
    "SHA3_3": 10,
    "SHA3_4": 11,
    "SHA3_5": 12,
    "SHA3_6": 13,
    "SHA3_7": 14,
    "SHA3_8": 15
  },
  "phasingHashAlgorithms": {},
  "maxPhasingDuration": 1440,
  "mintingHashAlgorithms": {},
  "totemTypes": {
    "NONE": 0,
    "BASIC": 1,
    "PRTZ": 2,
    "PRTS": 3
  },
  "taxRateTypes": {},
  "peerStates": {
    "RUNNING": 0,
    "UPDATING": 1,
    "DISCONNECTED": 2,
    "UNWELL": 3,
    "BANNED": 4
  },
  "requestTypes": {},
  "disabledAPIs": [],
  "disabledAPITags": [],
  "proxyNotForwardedRequests": [],
  "chains": {
    "FXT": 1,
    "BTC": 2
  },
  "chainProperties": {},
  "initialBaseTarget": "12345678901234567890",
  "secretPhraseWords": [2, 3, 4, 5],
  "bip32PathPrefix": [],
  "requestProcessingTime": 1
}

Response Fields

Field	Type	Description
accountPrefix	string	Account RS prefix (e.g. SHAMWARI)
genesisBlockId	string	Genesis block ID
epochBeginning	number	Epoch beginning timestamp
maxBetaBlockPayloadLength	number	Maximum beta block payload length
maxNumberOfFxtTransactions	number	Maximum number of FXT transactions per block
maxNumberOfBetaTransaction	number	Maximum number of beta (childchain) transactions per block
maxArbitraryMessageLength	number	Maximum arbitrary message length
maxEncryptedMessageLength	number	Maximum encrypted message length
maxPrunableMessageLength	number	Maximum prunable message length
maxPrunableEncryptedMessageLength	number	Maximum prunable encrypted message length
lastKnownBlock	object	Last known block ID and height
leasingDelay	number	Leasing delay in blocks
transactionTypes	object	Transaction types organized by type and subtype
transactionSubTypes	object	Transaction subtypes with properties (canHaveRecipient, mustHaveRecipient, isPhasingSafe, isPhasable, etc.)
currencyTypes	object	Currency type codes
votingModels	object	Voting model codes
maxContractFileDataLength	number	Maximum contract file data length
minBalanceModels	object	Minimum balance model codes
hashAlgorithms	object	Hash algorithm codes
phasingHashAlgorithms	object	Hash algorithms accepted for phasing
maxPhasingDuration	number	Maximum phasing duration in blocks
mintingHashAlgorithms	object	Hash algorithms accepted for currency minting
totemTypes	object	Totem type codes
taxRateTypes	object	Tax rate type metadata
peerStates	object	Peer state ordinal values
requestTypes	object	All API request types and their handler properties
disabledAPIs	array	List of disabled API request names
disabledAPITags	array	List of disabled API tags
proxyNotForwardedRequests	array	API requests not forwarded by proxy
chains	object	Chain names and IDs
chainProperties	object	Per-chain properties (currency, admin accounts, tax rates, etc.)
initialBaseTarget	string	Initial base target as unsigned integer string
secretPhraseWords	array	BIP32 secret phrase word counts
bip32PathPrefix	array	BIP32 path prefix components
requestProcessingTime	number	API request processing time in milliseconds

Source

GetConstants.java

Tags

INFO