diff --git a/docs/stable/9-blockchain-usage.md b/docs/stable/9-blockchain-usage.md
new file mode 100644
index 0000000..77d3f5e
--- /dev/null
+++ b/docs/stable/9-blockchain-usage.md
@@ -0,0 +1,184 @@
+---
+permalink: /spec/9
+parent: Stable specs
+title: 9/BLOCKCHAIN-USAGE
+---
+
+# 3/BLOCKCHAIN-USAGE
+
+> Version: 0.1
+>
+> Status: Stable
+>
+> Authors: Andrea Maria Piana <andreap@status.im>
+
+# Status interactions with the blockchain
+
+In this document is document all the interactions that the Status client has
+with the blockchain.
+
+1. [Wallet](#Wallet)
+2. [ENS](#ENS)
+
+## Wallet
+
+The wallet in Status has two main components:
+
+1) Sending transactions
+2) Fetching balance
+
+In the section below are described the `RPC` calls made the nodes, with a brief
+description of their functionality and how it is used by Status.
+
+1. [Sending transactions](#Sending-transactions)
+  *[EstimateGas](#EstimateGas)
+  *[PendingNonceAt](#PendingNonceAt)
+  *[SuggestGasPrice](#SuggestGasPrice)
+  *[SendTransaction](#SendTransaction)
+2. [Fetching balance](#Fetching-balance)
+  *[BlockByHash](#BlockByHash)
+  *[BlockByNumber](#BlockByNumber)
+  *[FilterLogs](#FilterLogs)
+  *[HeaderByNumber](#HeaderByNumber)
+  *[NonceAt](#NonceAt)
+  *[TransactionByHash](#TransactionByHash)
+  *[TransactionReceipt](#TransactionReceipt)
+
+### Sending transactions
+
+#### EstimateGase
+
+EstimateGas tries to estimate the gas needed to execute a specific transaction based on
+the current pending state of the backend blockchain. There is no guarantee that this is
+the true gas limit requirement as other transactions may be added or removed by miners,
+but it should provide a basis for setting a reasonable default.
+
+```
+func (ec *Client) EstimateGas(ctx context.Context, msg ethereum.CallMsg) (uint64, error)
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L499
+
+
+#### PendingNonceAt
+`PendingNonceAt` returns the account nonce of the given account in the pending state.
+ This is the nonce that should be used for the next transaction.
+
+ ```
+func (ec *Client) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error)
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L440
+
+
+#### SuggestGasPrice
+
+`SuggestGasPrice` retrieves the currently suggested gas price to allow a timely
+execution of a transaction.
+
+```
+func (ec *Client) SuggestGasPrice(ctx context.Context) (*big.Int, error)
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L487
+
+#### SendTransaction
+
+`SendTransaction` injects a signed transaction into the pending pool for execution.
+
+If the transaction was a contract creation use the TransactionReceipt method to get the
+contract address after the transaction has been mined.
+
+
+```
+func (ec *Client) SendTransaction(ctx context.Context, tx *types.Transaction) error 
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L512
+
+### Fetching balance
+
+#### BlockByHash
+
+BlockByHash returns the given full block.
+
+It is used by status to fetch a given block which will then be inspected for 
+transfers to the user address, both tokens and ETH.
+
+```
+func (ec *Client) BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error)
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L78
+
+#### BlockByNumber
+
+`BlockByNumber` returns a block from the current canonical chain. If number is nil, the
+latest known block is returned.
+
+```
+func (ec *Client) BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error)
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L82
+
+#### FilterLogs
+
+`FilterLogs` executes a filter query.
+
+Status uses this function to filter out logs, using the hash of the block
+and the address that we are interested in, both inbound and outbound.
+
+```
+func (ec *Client) FilterLogs(ctx context.Context, q ethereum.FilterQuery) ([]types.Log, error) 
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L377
+
+
+#### NonceAt
+
+`NonceAt` returns the account nonce of the given account.
+
+```
+func (ec *Client) NonceAt(ctx context.Context, account common.Address, blockNumber *big.Int) (uint64, error)
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L366
+
+
+#### TransactionByHash
+
+`TransactionByHash` returns the transaction with the given hash, used to inspect those 
+transaction made/received by the user.
+
+```
+func (ec *Client) TransactionByHash(ctx context.Context, hash common.Hash) (tx *types.Transaction, isPending bool, err error)
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L202
+
+#### HeaderByNumber
+
+`HeaderByNumber` returns a block header from the current canonical chain.
+
+```
+func (ec *Client) HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error) 
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L172
+
+
+#### TransactionReceipt
+
+`TransactionReceipt` returns the receipt of a transaction by transaction hash.
+It is used in status to check if a token transfer was made to the user address.
+
+```
+func (ec *Client) TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error)
+```
+
+https://github.com/ethereum/go-ethereum/blob/26d271dfbba1367326dec38068f9df828d462c61/ethclient/ethclient.go#L270
+
+
+## ENS