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+# Hardware Wallet
+
+## Protocol for the signing of transactions
+
+The fundamental objective of the development of the Hardware Wallet is the safe maintenance of the vital data of a wallet, such as the seed. Due to what is necessary for the signing of transactions, the implementation of a protocol that facilitates the signing of transactions internally in the Hardware Wallet is required.
+
+In broad strokes, and after a series of steps the protocol provides the following result:
+
+![long-transactions-intro](/_data/img/long-transaction-intro.png)
+
+The signing process consists of three fundamental steps, wich are:
+
+- Initialization
+- Calculating inner hash of transaction
+- Calculating signatures for all inputs
+
+Each step is based on a cycle of sending and receiving groups of Inputs and Outputs, with at most 7 elements.
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