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A node that stores the full transaction history of the tangle and does not get pruned by snapshots.
For questions related to the IOTA Client library (https://client-lib.docs.iota.org/)
For questions related to Android wallet for IOTA:
Flash is a bi-directional off-Tangle payment channel to enable instantaneous, high-throughput transactions.
For questions related DAG (Directed Acyclic Graph)
For questions related to IOTA Nelson
used for Questions on the official iota Cli-Wallet.