-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Release 1.5.3e

https://bitbucket.org/JeanLucPicard/nxt/downloads/nxt-client-1.5.3e.zip

sha256:

393a71bc869b7dafb2830eef2d29665f24c7c1c64741f3ecc103a088c4f85ac3  nxt-client-1.5.3e.zip


This is a development release for testing only. Source code is not provided.


Change log:

This is an experimental release. It is a required update for all testnet nodes,
but is also possible to run on main net.

This update adds the Prunable Tagged Data feature, planned to be enabled at the
voting system block too.


Prunable tagged data are similar to prunable plain messages with no recipient,
but with additional searchable metadata fields added. This feature can be used
for decentralized and trustless distribution of small (up to 42k, including
the metadata) pieces of data, which are by default stored for two weeks only
(24h on testnet), but can optionally be stored longer or indefinitely by some
nodes, and can be verified against the blockchain even after their expiration.

Currently each tagged data can have the following fields, in addition to the
data itself: name (required), description, tags, type, isText, filename.

Name, description and tags are indexed and searchable using Lucene. All data
and metadata is prunable, after pruning only a single 32 byte hash remains.

Fee for either uploading or extending tagged data is based on the total data
size (including metadata), and is 1 NXT for up to 1k bytes, 0.1 NXT for each
1k above, up to the limit of 42k.


New APIs:

UploadTaggedData - create and broadcast new tagged data.

ExtendTaggedData - extend the expiration time of already uploaded tagged data.
If the data is still available, only the transaction id is needed. If not,
already pruned data can be resurrected by including (in addition to the
original transaction id) all of its fields too, i.e. name, description, etc.
Anyone can submit an extension, not only the original uploader. Each extend
transaction increases the expiration deadline by two weeks (24 h on testnet).
Extending an existing tagged data from another account does not change the
original submitter account id by which it is indexed and searchable.

VerifyTaggedData - used to verify expired tagged data downloaded from another
node, against the hash in the current blockchain.

SearchTaggedData - full text search on name, tags, and description, optionally
filtered by submitter account.

GetTaggedData - retrieve tagged data by transaction id.

GetAccountTaggedData - retrieve all tagged data submitted by a given account.

GetAllTaggedData - retrieve all existing tagged data.

GetDataTags - returns the distinct tags of all tagged data, with the number
of data having each tag.

GetDataTagsLike - prefix search of data tags.

GetDataTagCount - the total number of distinct tags.

All the Get* and Search* APIs above can only retrieve tagged data that has
not been pruned yet.

There is no client UI support for any of these APIs. It is expected that
specialized third party plugins will be developed for specific tagged data
use cases, depending on file type and target user group.

Currently the pruning of tagged data is controlled by the same configuration
properties that are used for prunable messages expiration.

Same as with prunable messages, when using broadcastTransaction API to submit
an already signed tagged data upload transaction, the prunable parts must be
in the prunableAttachmentJSON parameter in case transactionBytes parameter is
used. If submitting transactionJSON, it already has the prunable parts.


New debug APIs:

GetAllBroadcastedTransactions - if transaction rebroadcasting is enabled,
returns the unconfirmed transactions that have been broadcasted from this node
but have not yet been received back from a peer.

GetAllWaitingTransactions - returns the unconfirmed transactions that are
currently temporarily kept in memory during transaction processing.

RebroadcastUnconfirmedTransactions - if transaction rebroadcasting is enabled,
causes transactions currently in the unconfirmed pool to be broadcasted to
peers again, until received back.


Other changes and bugfixes:

Improved handling of invalid transactions during block generation. Fixed
validation of AE order cancellation transactions. Fixed a memory leak in
processing of unconfirmed transactions. Set the default limit on waiting
unconfirmed transactions nxt.maxUnconfirmedTransactions to 1000.

The DGS goods delivery data size will be limited to 1000 bytes after VS block.

Bugfixes in prunable messages processing.

Fixed phasing with whitelisted approval accounts.

On testnet, this release will perform a full rescan on first start with
rollback to height 263895.


-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
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=oJRe
-----END PGP SIGNATURE-----