There are a few ways to do this, but I'll describe the most straight forward one. Find an archival node from http://www.peerexplorer.com/api_openapi_archival.
If you pick any one of the ip addresses in that list you can then query that node to verify if it is a archival node by calling its getBlockchainStatus function, for example: http://18.104.22.168:7876/...
Of course there is a way to change anything. But you must carefully think over the changes you do. The source code is available here. Here are some directions:
Blocksize to increase it?
Change the MAX_NUMBER_OF_TRANSACTIONS constant
Block timing can this be increased either along side blocksize or separately?
It can be increased or decreased ...
You can download your file using this API
where nnnn = Txid of your uploaded file
You can search txid for all your uploads using requestType=getAccountTaggedData&account=NXT-XXXX-XXXX-XXXX-XXXXX
where NXT-XXXX-XXXX-XXXX-XXXXX is your account number
If your ...
Files and any other prunable data are maintained by all nodes for 90 days by default (controlled by nxt.maxPrunableLifetime in nxt-default.properties). The minimum value is 14 days on mainnet and 24 hours on testnet.
Note that pruning is performed at the same time as derived table trimming, which
by default is every 1000 blocks, so the actual removal of the ...