Fix markdown linting issues and update EIP-101

EIPS/eip-101.md

@@ -1,3 +1,40 @@
+# EIP-101: Serenity Currency and Crypto Abstraction
+
+### Specification
+
+1. Accounts now have only two fields in their RLP encoding: code and storage.
+2. Ether is no longer stored in account objects directly. Instead, a contract is premine at address 0 to store all ether holdings, and the `eth.getBalance` command in Web3 is now remapped to interact with this contract.
+3. The `msg.value` opcode is no longer available in this new model.
+4. A transaction now consists of four fields: `to`, `startgas`, `data`, and `code`. The `startgas` field specifies the initial gas allocated for the transaction.
+5. Aside from validating the RLP encoding, the following checks are made:
+    - The `to` field is 20 bytes long.
+    - `startgas` is an integer.
+    - `code` is either empty or hashes to the `to` address. Other than these checks, the transaction is valid; however, block gas limits apply.
+6. Gas is charged for bytes in `code` at the same rate as data.
+7. When a transaction is sent, if the receiving account does not exist, it is created, and its code is set to the code specified in the transaction. If the account already exists, the provided code is ignored.
+8. A `tx.gas` opcode is introduced alongside the existing `msg.gas` at index `0x5c`. This allows a transaction to reference the original gas allocation set for it, providing more control over gas usage.
+
+### Default Code for Simple User Accounts
+
+Simple user accounts may have the following default code to implement signature and nonce checking:
+
+```python
+# We assume the data schema is as follows:
+# bytes 0-31: v (ECDSA sig)
+# bytes 32-63: r (ECDSA sig)
+# bytes 64-95: s (ECDSA sig)
+# bytes 96-127: sequence number (formerly nonce)
+# bytes 128-159: gas price
+# bytes 172-191: to address
+# bytes 192+: data
+
+# Get the transaction hash for signing
+~mstore(0, msg.gas)
+~calldatacopy(32, 96, ~calldatasize() - 96)
+h = sha3(96, ~calldatasize() - 96)
+
+# Retrieve the sender address using ECRECOVER
+~call(5000, 3, [h, ~calldataload(0), ~calldataload(32), ~calldataload(64)], 128, ref(addr), 32)
 ---
 eip: 101
 title: Serenity Currency and Crypto Abstraction