diff --git a/packages/core-db/package.json b/packages/core-db/package.json
index a312289514b0..fea194fc595a 100644
--- a/packages/core-db/package.json
+++ b/packages/core-db/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eth-optimism/core-db",
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "Optimism DB Utils",
   "main": "build/index.js",
   "files": [
@@ -29,7 +29,7 @@
     "url": "https://github.com/ethereum-optimism/optimism-monorepo.git"
   },
   "dependencies": {
-    "@eth-optimism/core-utils": "0.0.1-alpha.11",
+    "@eth-optimism/core-utils": "0.0.1-alpha.12",
     "abstract-leveldown": "^6.2.2",
     "async-lock": "^1.2.2",
     "chai": "^4.2.0",
diff --git a/packages/core-utils/package.json b/packages/core-utils/package.json
index 877d937ab529..45318259b85d 100644
--- a/packages/core-utils/package.json
+++ b/packages/core-utils/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eth-optimism/core-utils",
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "Optimism Core Utils",
   "main": "build/index.js",
   "files": [
diff --git a/packages/docs/package.json b/packages/docs/package.json
index c87e9062e371..e1e7a068eca4 100644
--- a/packages/docs/package.json
+++ b/packages/docs/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@eth-optimism/docs",
   "private": true,
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "Optimism docs",
   "author": "Optimism",
   "license": "MIT",
diff --git a/packages/optimistic-game-semantics/package.json b/packages/optimistic-game-semantics/package.json
index 7210a297378f..57233e75991c 100644
--- a/packages/optimistic-game-semantics/package.json
+++ b/packages/optimistic-game-semantics/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eth-optimism/optimistic-game-semantics",
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "Optimism Optimistic Game Semantics",
   "main": "build/index.js",
   "files": [
@@ -29,8 +29,8 @@
     "url": "https://github.com/ethereum-optimism/optimism-monorepo.git"
   },
   "dependencies": {
-    "@eth-optimism/core-db": "0.0.1-alpha.11",
-    "@eth-optimism/core-utils": "0.0.1-alpha.11",
+    "@eth-optimism/core-db": "0.0.1-alpha.12",
+    "@eth-optimism/core-utils": "0.0.1-alpha.12",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "debug": "^4.1.1",
diff --git a/packages/ovm-truffle-provider-wrapper/index.ts b/packages/ovm-truffle-provider-wrapper/index.ts
index 208be98174e2..d473b3c44398 100644
--- a/packages/ovm-truffle-provider-wrapper/index.ts
+++ b/packages/ovm-truffle-provider-wrapper/index.ts
@@ -4,7 +4,7 @@ import { execSync, spawn } from 'child_process'
  * Starts a local OVM node process for testing. It will be killed when the current process terminates.
  */
 const startLocalNode = () => {
-  const runText = `(async function(){ const {runFullnode} = require('@eth-optimism/rollup-full-node');runFullnode();})();`
+  const runText = `(async function(){ const {runFullnode} = require('@eth-optimism/rollup-full-node');runFullnode(true);})();`
 
   // Assumes this process was kicked off with node, but that's true for `truffle test` and `yarn ...`
   const sub = spawn(process.argv[0], [`-e`, `${runText}`], {
diff --git a/packages/ovm-truffle-provider-wrapper/package.json b/packages/ovm-truffle-provider-wrapper/package.json
index 8d31447e910c..0119c947bf61 100644
--- a/packages/ovm-truffle-provider-wrapper/package.json
+++ b/packages/ovm-truffle-provider-wrapper/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eth-optimism/ovm-truffle-provider-wrapper",
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "Optimism Truffle Provider Wrapper",
   "main": "build/index.js",
   "files": [
@@ -28,7 +28,7 @@
     "url": "https://github.com/ethereum-optimism/optimism-monorepo.git"
   },
   "dependencies": {
-    "@eth-optimism/rollup-full-node": "0.0.1-alpha.11"
+    "@eth-optimism/rollup-full-node": "0.0.1-alpha.12"
   },
   "devDependencies": {
     "@types/node": "^12.0.7",
diff --git a/packages/ovm/package.json b/packages/ovm/package.json
index 5f028cad1f87..cdf39a32f056 100644
--- a/packages/ovm/package.json
+++ b/packages/ovm/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eth-optimism/ovm",
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "An optimistic execution-compatible EVM",
   "main": "build/index.js",
   "files": [
@@ -49,9 +49,9 @@
     "typescript": "^3.3.3333"
   },
   "dependencies": {
-    "@eth-optimism/core-db": "0.0.1-alpha.11",
-    "@eth-optimism/core-utils": "0.0.1-alpha.11",
-    "@eth-optimism/rollup-core": "0.0.1-alpha.11",
+    "@eth-optimism/core-db": "0.0.1-alpha.12",
+    "@eth-optimism/core-utils": "0.0.1-alpha.12",
+    "@eth-optimism/rollup-core": "0.0.1-alpha.12",
     "@types/sinon-chai": "^3.2.2",
     "chai": "^4.2.0",
     "ethereum-waffle": "2.1.0",
diff --git a/packages/rollup-contracts/package.json b/packages/rollup-contracts/package.json
index a11e3837e0ee..ef3cf759f041 100644
--- a/packages/rollup-contracts/package.json
+++ b/packages/rollup-contracts/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eth-optimism/rollup-contracts",
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "Optimistic Rollup smart contracts",
   "main": "build/index.js",
   "files": [
@@ -43,9 +43,9 @@
     "typescript": "^3.3.3333"
   },
   "dependencies": {
-    "@eth-optimism/core-db": "0.0.1-alpha.11",
-    "@eth-optimism/core-utils": "0.0.1-alpha.11",
-    "@eth-optimism/rollup-core": "0.0.1-alpha.11",
+    "@eth-optimism/core-db": "0.0.1-alpha.12",
+    "@eth-optimism/core-utils": "0.0.1-alpha.12",
+    "@eth-optimism/rollup-core": "0.0.1-alpha.12",
     "@types/sinon-chai": "^3.2.2",
     "chai": "^4.2.0",
     "ethereum-waffle": "2.1.0",
diff --git a/packages/rollup-core/package.json b/packages/rollup-core/package.json
index d4c200c1b7c9..96c118c055d4 100644
--- a/packages/rollup-core/package.json
+++ b/packages/rollup-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eth-optimism/rollup-core",
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "[Optimism] Optimistic Rollup Core Library",
   "main": "build/index.js",
   "files": [
@@ -29,8 +29,8 @@
     "url": "https://github.com/ethereum-optimism/optimism-monorepo.git"
   },
   "dependencies": {
-    "@eth-optimism/core-db": "0.0.1-alpha.11",
-    "@eth-optimism/core-utils": "0.0.1-alpha.11",
+    "@eth-optimism/core-db": "0.0.1-alpha.12",
+    "@eth-optimism/core-utils": "0.0.1-alpha.12",
     "async-lock": "^1.2.2",
     "ethers": "^4.0.39"
   },
diff --git a/packages/rollup-dev-tools/package.json b/packages/rollup-dev-tools/package.json
index a47f048e32dc..d4444c8b4480 100644
--- a/packages/rollup-dev-tools/package.json
+++ b/packages/rollup-dev-tools/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eth-optimism/rollup-dev-tools",
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "[Optimism] Optimistic Rollup Dev Tools Library",
   "main": "build/index.js",
   "files": [
@@ -33,8 +33,8 @@
     "url": "https://github.com/ethereum-optimism/optimism-monorepo.git"
   },
   "dependencies": {
-    "@eth-optimism/core-utils": "0.0.1-alpha.11",
-    "@eth-optimism/rollup-core": "0.0.1-alpha.11",
+    "@eth-optimism/core-utils": "0.0.1-alpha.12",
+    "@eth-optimism/rollup-core": "0.0.1-alpha.12",
     "async-lock": "^1.2.2",
     "bn.js": "^5.1.1",
     "dotenv": "^8.2.0",
diff --git a/packages/rollup-full-node/package.json b/packages/rollup-full-node/package.json
index dc71a9e77bbd..43d13e42f1c6 100644
--- a/packages/rollup-full-node/package.json
+++ b/packages/rollup-full-node/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eth-optimism/rollup-full-node",
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "[Optimism] Optimistic Rollup Full Node Library",
   "main": "build/index.js",
   "files": [
@@ -32,10 +32,10 @@
     "url": "https://github.com/ethereum-optimism/optimism-monorepo.git"
   },
   "dependencies": {
-    "@eth-optimism/core-db": "0.0.1-alpha.11",
-    "@eth-optimism/core-utils": "0.0.1-alpha.11",
-    "@eth-optimism/ovm": "0.0.1-alpha.11",
-    "@eth-optimism/rollup-core": "0.0.1-alpha.11",
+    "@eth-optimism/core-db": "0.0.1-alpha.12",
+    "@eth-optimism/core-utils": "0.0.1-alpha.12",
+    "@eth-optimism/ovm": "0.0.1-alpha.12",
+    "@eth-optimism/rollup-core": "0.0.1-alpha.12",
     "async-lock": "^1.2.2",
     "axios": "^0.19.0",
     "cors": "^2.8.5",
diff --git a/packages/rollup-full-node/src/app/index.ts b/packages/rollup-full-node/src/app/index.ts
index 18ecd9b71f7d..bb7b2e8d5f22 100644
--- a/packages/rollup-full-node/src/app/index.ts
+++ b/packages/rollup-full-node/src/app/index.ts
@@ -1,7 +1,8 @@
 export * from './block-builder'
 export * from './block-submitter'
 export * from './fullnode-rpc-server'
-export * from './handler'
+export * from './web3-rpc-handler'
+export * from './test-web3-rpc-handler'
 export * from './utils'
 
 // Constant exports
diff --git a/packages/rollup-full-node/src/app/test-web3-rpc-handler.ts b/packages/rollup-full-node/src/app/test-web3-rpc-handler.ts
new file mode 100644
index 000000000000..af96d8091a89
--- /dev/null
+++ b/packages/rollup-full-node/src/app/test-web3-rpc-handler.ts
@@ -0,0 +1,97 @@
+/* External Imports */
+import { add0x, getLogger, remove0x } from '@eth-optimism/core-utils'
+import { OPCODE_WHITELIST_MASK } from '@eth-optimism/ovm'
+
+import { createMockProvider, getWallets } from 'ethereum-waffle'
+import { Contract, Wallet } from 'ethers'
+import { Web3Provider } from 'ethers/providers'
+
+/* Internal Imports */
+import { DEFAULT_ETHNODE_GAS_LIMIT } from './index'
+import { DefaultWeb3Handler } from './web3-rpc-handler'
+import { UnsupportedMethodError, Web3RpcMethods } from '../types'
+
+const log = getLogger('test-web3-handler')
+
+/**
+ * Test Handler that provides extra functionality for testing.
+ */
+export class TestWeb3Handler extends DefaultWeb3Handler {
+  public static readonly successString = 'success'
+
+  private timestampIncreaseSeconds: number = 0
+
+  /**
+   * Creates a local node, deploys the L2ExecutionManager to it, and returns a
+   * TestHandler that handles Web3 requests to it.
+   *
+   * @param provider (optional) The web3 provider to use.
+   * @returns The constructed Web3 handler.
+   */
+  public static async create(
+    provider: Web3Provider = createMockProvider({
+      gasLimit: DEFAULT_ETHNODE_GAS_LIMIT,
+    })
+  ): Promise<TestWeb3Handler> {
+    // Initialize a fullnode for us to interact with
+    const [wallet] = getWallets(provider)
+    const executionManager: Contract = await DefaultWeb3Handler.deployExecutionManager(
+      wallet,
+      OPCODE_WHITELIST_MASK
+    )
+
+    return new TestWeb3Handler(provider, wallet, executionManager)
+  }
+
+  protected constructor(
+    provider: Web3Provider,
+    wallet: Wallet,
+    executionManager: Contract
+  ) {
+    super(provider, wallet, executionManager)
+  }
+
+  /**
+   * Override to add some test RPC methods.
+   */
+  public async handleRequest(method: string, params: any[]): Promise<string> {
+    if (method === Web3RpcMethods.increaseTimestamp) {
+      this.assertParameters(params, 1)
+      this.increaseTimestamp(params[0])
+      log.debug(`Set increased timestamp by ${params[0]} seconds.`)
+      return TestWeb3Handler.successString
+    }
+    if (method === Web3RpcMethods.getTimestamp) {
+      this.assertParameters(params, 0)
+      return add0x(this.getTimestamp().toString(16))
+    }
+
+    return super.handleRequest(method, params)
+  }
+
+  /**
+   * Returns the configured timestamp if there is one, else standard timestamp calculation.
+   * @returns The timestamp.
+   */
+  protected getTimestamp(): number {
+    return super.getTimestamp() + this.timestampIncreaseSeconds
+  }
+
+  /**
+   * Sets timestamp to use for future transactions.
+   * @param increaseSeconds The increase in seconds as a hex string
+   */
+  private increaseTimestamp(increaseSeconds: any): void {
+    try {
+      const increaseNumber = parseInt(remove0x(increaseSeconds), 16)
+      if (increaseNumber < 0) {
+        throw Error('invalid param')
+      }
+      this.timestampIncreaseSeconds += increaseNumber
+    } catch (e) {
+      const msg: string = `Expected parameter for ${Web3RpcMethods.increaseTimestamp} to be a positive number or string of a positive, base-10 number. Received: ${increaseSeconds}`
+      log.error(msg)
+      throw new UnsupportedMethodError(msg)
+    }
+  }
+}
diff --git a/packages/rollup-full-node/src/app/utils.ts b/packages/rollup-full-node/src/app/utils.ts
index b94f9b1e3129..d8bf0f4304c2 100644
--- a/packages/rollup-full-node/src/app/utils.ts
+++ b/packages/rollup-full-node/src/app/utils.ts
@@ -7,7 +7,7 @@ import { FullnodeHandler } from '../types'
 import { Web3Provider } from 'ethers/providers'
 
 /* Internal Imports */
-import { DefaultWeb3Handler } from './handler'
+import { DefaultWeb3Handler } from './web3-rpc-handler'
 import { FullnodeRpcServer } from './fullnode-rpc-server'
 
 const log = getLogger('utils')
diff --git a/packages/rollup-full-node/src/app/handler.ts b/packages/rollup-full-node/src/app/web3-rpc-handler.ts
similarity index 97%
rename from packages/rollup-full-node/src/app/handler.ts
rename to packages/rollup-full-node/src/app/web3-rpc-handler.ts
index b09b373ae94f..7b60e13ae025 100644
--- a/packages/rollup-full-node/src/app/handler.ts
+++ b/packages/rollup-full-node/src/app/web3-rpc-handler.ts
@@ -10,7 +10,6 @@ import {
 import {
   CHAIN_ID,
   GAS_LIMIT,
-  convertInternalLogsToOvmLogs,
   L2ExecutionManagerContractDefinition,
   OPCODE_WHITELIST_MASK,
   internalTxReceiptToOvmTxReceipt,
@@ -63,7 +62,7 @@ export class DefaultWeb3Handler implements Web3Handler, FullnodeHandler {
     return new DefaultWeb3Handler(provider, wallet, executionManager)
   }
 
-  private constructor(
+  protected constructor(
     private readonly provider: Web3Provider,
     private readonly wallet: Wallet,
     private readonly executionManager: Contract
@@ -143,7 +142,7 @@ export class DefaultWeb3Handler implements Web3Handler, FullnodeHandler {
         const msg: string = `Method / params [${method} / ${JSON.stringify(
           params
         )}] is not supported by this Web3 handler!`
-        log.error(msg)
+        log.info(msg)
         throw new UnsupportedMethodError(msg)
     }
 
@@ -172,13 +171,15 @@ export class DefaultWeb3Handler implements Web3Handler, FullnodeHandler {
     )
     // First generate the internalTx calldata
     const internalCalldata = this.generateUnsignedCallCalldata(
-      0,
+      this.getTimestamp(),
       0,
       txObject['to'],
       txObject['data'],
       txObject['from']
     )
 
+    log.debug(`calldata: ${internalCalldata}`)
+
     let response
     try {
       // Then actually make the call and get the response
@@ -219,7 +220,7 @@ export class DefaultWeb3Handler implements Web3Handler, FullnodeHandler {
     )
     // First generate the internalTx calldata
     const internalCalldata = this.generateUnsignedCallCalldata(
-      0,
+      this.getTimestamp(),
       0,
       txObject['to'],
       txObject['data'],
@@ -331,6 +332,7 @@ export class DefaultWeb3Handler implements Web3Handler, FullnodeHandler {
     const ovmTxReceipt = await internalTxReceiptToOvmTxReceipt(
       internalTxReceipt
     )
+
     log.debug(
       `Returning tx receipt for ovm tx hash [${ovmTxHash}]: [${internalTxReceipt}]`
     )
@@ -400,6 +402,15 @@ export class DefaultWeb3Handler implements Web3Handler, FullnodeHandler {
     })
   }
 
+  /**
+   * Gets the current number of seconds since the epoch.
+   *
+   * @returns The seconds since epoch.
+   */
+  protected getTimestamp(): number {
+    return Math.round(Date.now() / 1000)
+  }
+
   /**
    * Maps the provided OVM transaction hash to the provided internal transaction hash by storing it in our
    * L2 Execution Manager contract.
@@ -447,7 +458,7 @@ export class DefaultWeb3Handler implements Web3Handler, FullnodeHandler {
     const ovmTo = ovmTx.to === null ? ZERO_ADDRESS : ovmTx.to
     // Construct the raw transaction calldata
     const internalCalldata = this.generateEOACallCalldata(
-      0,
+      this.getTimestamp(),
       0,
       ovmTx.nonce,
       ovmTo,
@@ -472,7 +483,7 @@ export class DefaultWeb3Handler implements Web3Handler, FullnodeHandler {
     return this.wallet.sign(internalTx)
   }
 
-  private static async deployExecutionManager(
+  protected static async deployExecutionManager(
     wallet: Wallet,
     opcodeWhitelistMask: string
   ): Promise<Contract> {
@@ -536,7 +547,7 @@ export class DefaultWeb3Handler implements Web3Handler, FullnodeHandler {
     ])
   }
 
-  private assertParameters(
+  protected assertParameters(
     params: any[],
     expected: number,
     defaultLast?: any
diff --git a/packages/rollup-full-node/src/exec/fullnode.ts b/packages/rollup-full-node/src/exec/fullnode.ts
index 3b351ff948e4..b17fd935d656 100644
--- a/packages/rollup-full-node/src/exec/fullnode.ts
+++ b/packages/rollup-full-node/src/exec/fullnode.ts
@@ -1,21 +1,31 @@
 /* External Imports */
-import { getLogger, Logger } from '@eth-optimism/core-utils'
+import { ExpressHttpServer, getLogger, Logger } from '@eth-optimism/core-utils'
 
 /* Internal Imports */
-import { FullnodeRpcServer, DefaultWeb3Handler } from '../app'
+import { FullnodeRpcServer, DefaultWeb3Handler, TestWeb3Handler } from '../app'
 
 const log: Logger = getLogger('rollup-fullnode')
 
-export const runFullnode = async (): Promise<void> => {
+/**
+ * Runs a fullnode.
+ * @param testFullnode Whether or not this is a test.
+ */
+export const runFullnode = async (
+  testFullnode: boolean = false
+): Promise<ExpressHttpServer> => {
   // TODO Get these from config
   const host = '0.0.0.0'
   const port = 8545
 
-  const fullnodeHandler = await DefaultWeb3Handler.create()
+  const fullnodeHandler = testFullnode
+    ? await TestWeb3Handler.create()
+    : await DefaultWeb3Handler.create()
   const fullnodeRpcServer = new FullnodeRpcServer(fullnodeHandler, host, port)
 
   fullnodeRpcServer.listen()
 
   const baseUrl = `http://${host}:${port}`
   log.info(`Listening at ${baseUrl}`)
+
+  return fullnodeRpcServer
 }
diff --git a/packages/rollup-full-node/src/types/index.ts b/packages/rollup-full-node/src/types/index.ts
index f84df10aba4b..fd2abaa71557 100644
--- a/packages/rollup-full-node/src/types/index.ts
+++ b/packages/rollup-full-node/src/types/index.ts
@@ -2,4 +2,4 @@ export * from './aggregator'
 export * from './block-builder'
 export * from './block-submitter'
 export * from './errors'
-export * from './handler'
+export * from './web3-rpc-handler'
diff --git a/packages/rollup-full-node/src/types/handler.ts b/packages/rollup-full-node/src/types/web3-rpc-handler.ts
similarity index 93%
rename from packages/rollup-full-node/src/types/handler.ts
rename to packages/rollup-full-node/src/types/web3-rpc-handler.ts
index 8bb159c05077..2c0afcea7715 100644
--- a/packages/rollup-full-node/src/types/handler.ts
+++ b/packages/rollup-full-node/src/types/web3-rpc-handler.ts
@@ -37,4 +37,8 @@ export enum Web3RpcMethods {
   getTransactionReceipt = 'eth_getTransactionReceipt',
   networkVersion = 'net_version',
   sendRawTransaction = 'eth_sendRawTransaction',
+
+  // Test methods:
+  increaseTimestamp = 'evm_increaseTime',
+  getTimestamp = 'evm_getTime',
 }
diff --git a/packages/rollup-full-node/test/app/handler.spec.ts b/packages/rollup-full-node/test/app/handler.spec.ts
index 7b018fc7beda..c6ff0c15840a 100644
--- a/packages/rollup-full-node/test/app/handler.spec.ts
+++ b/packages/rollup-full-node/test/app/handler.spec.ts
@@ -1,19 +1,14 @@
 import '../setup'
 /* External Imports */
 import { getLogger } from '@eth-optimism/core-utils'
-import { DB, newInMemoryDB } from '@eth-optimism/core-db/'
 
 /* Internal Imports */
-import {
-  FullnodeRpcServer,
-  deployOvmContract,
-  DefaultWeb3Handler,
-} from '../../src/app'
+import { FullnodeRpcServer, DefaultWeb3Handler } from '../../src/app'
 import * as SimpleStorage from '../contracts/build/SimpleStorage.json'
 import { ethers, ContractFactory } from 'ethers'
 import { FullnodeHandler } from '../../src/types'
 
-const log = getLogger('ethnode-proxy', true)
+const log = getLogger('web3-handler', true)
 
 const host = '0.0.0.0'
 const port = 9999
diff --git a/packages/rollup-full-node/test/app/test-handler.spec.ts b/packages/rollup-full-node/test/app/test-handler.spec.ts
new file mode 100644
index 000000000000..b8881c59cfbf
--- /dev/null
+++ b/packages/rollup-full-node/test/app/test-handler.spec.ts
@@ -0,0 +1,63 @@
+import '../setup'
+/* External Imports */
+import { add0x, getLogger, remove0x } from '@eth-optimism/core-utils'
+
+/* Internal Imports */
+import { Web3RpcMethods, TestWeb3Handler } from '../../src'
+
+const log = getLogger('test-web3-handler', true)
+
+const secondsSinceEopch = (): number => {
+  return Math.round(Date.now() / 1000)
+}
+
+describe('TestHandler', () => {
+  let testHandler: TestWeb3Handler
+
+  beforeEach(async () => {
+    testHandler = await TestWeb3Handler.create()
+  })
+
+  describe('Timestamps', () => {
+    it('should get timestamp', async () => {
+      const currentTime = secondsSinceEopch()
+      const res: string = await testHandler.handleRequest(
+        Web3RpcMethods.getTimestamp,
+        []
+      )
+      const timeAfter = secondsSinceEopch()
+
+      const timestamp: number = parseInt(remove0x(res), 16)
+      timestamp.should.be.gte(currentTime, 'Timestamp out of range')
+      timestamp.should.be.lte(timeAfter, 'Timestamp out of range')
+    })
+
+    it('should increase timestamp', async () => {
+      const previous: string = await testHandler.handleRequest(
+        Web3RpcMethods.getTimestamp,
+        []
+      )
+      const previousTimestamp: number = parseInt(remove0x(previous), 16)
+
+      const increase: number = 9999
+      const setRes: string = await testHandler.handleRequest(
+        Web3RpcMethods.increaseTimestamp,
+        [add0x(increase.toString(16))]
+      )
+      setRes.should.equal(
+        TestWeb3Handler.successString,
+        'Should increase timestamp!'
+      )
+
+      const fetched: string = await testHandler.handleRequest(
+        Web3RpcMethods.getTimestamp,
+        []
+      )
+      const fetchedTimestamp: number = parseInt(remove0x(fetched), 16)
+      fetchedTimestamp.should.be.gte(
+        previousTimestamp + increase,
+        'Timestamp was not increased properly!'
+      )
+    })
+  })
+})
diff --git a/packages/solc-transpiler/package.json b/packages/solc-transpiler/package.json
index 0e6a108fdf98..37eb637ef25e 100644
--- a/packages/solc-transpiler/package.json
+++ b/packages/solc-transpiler/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eth-optimism/solc-transpiler",
-  "version": "0.0.1-alpha.11",
+  "version": "0.0.1-alpha.12",
   "description": "Optimism Transpiler Solc Compiler Wrapper",
   "main": "build/index.js",
   "files": [
@@ -29,8 +29,8 @@
     "url": "https://github.com/ethereum-optimism/optimism-monorepo.git"
   },
   "dependencies": {
-    "@eth-optimism/core-utils": "0.0.1-alpha.11",
-    "@eth-optimism/rollup-dev-tools": "0.0.1-alpha.11",
+    "@eth-optimism/core-utils": "0.0.1-alpha.12",
+    "@eth-optimism/rollup-dev-tools": "0.0.1-alpha.12",
     "require-from-string": "^2.0.2",
     "solc": "^0.5.12"
   },
diff --git a/yarn.lock b/yarn.lock
index abd6145327a3..c875a150402e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3251,7 +3251,7 @@ debug@3.1.0, debug@=3.1.0:
   dependencies:
     ms "2.0.0"
 
-debug@3.2.6, debug@^3.1.0, debug@^3.2.6:
+debug@3.2.6, debug@^3.1.0:
   version "3.2.6"
   resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
   integrity sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==
@@ -3377,11 +3377,6 @@ deep-equal@~1.1.1:
     object-keys "^1.1.1"
     regexp.prototype.flags "^1.2.0"
 
-deep-extend@^0.6.0:
-  version "0.6.0"
-  resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.6.0.tgz#c4fa7c95404a17a9c3e8ca7e1537312b736330ac"
-  integrity sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==
-
 default-compare@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/default-compare/-/default-compare-1.0.0.tgz#cb61131844ad84d84788fb68fd01681ca7781a2f"
@@ -3513,11 +3508,6 @@ detect-indent@^5.0.0:
   resolved "https://registry.yarnpkg.com/detect-indent/-/detect-indent-5.0.0.tgz#3871cc0a6a002e8c3e5b3cf7f336264675f06b9d"
   integrity sha1-OHHMCmoALow+Wzz38zYmRnXwa50=
 
-detect-libc@^1.0.2:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/detect-libc/-/detect-libc-1.0.3.tgz#fa137c4bd698edf55cd5cd02ac559f91a4c4ba9b"
-  integrity sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=
-
 dezalgo@^1.0.0:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/dezalgo/-/dezalgo-1.0.3.tgz#7f742de066fc748bc8db820569dddce49bf0d456"
@@ -5669,7 +5659,7 @@ humanize-ms@^1.2.1:
   dependencies:
     ms "^2.0.0"
 
-iconv-lite@0.4.24, iconv-lite@^0.4.24, iconv-lite@^0.4.4, iconv-lite@~0.4.13:
+iconv-lite@0.4.24, iconv-lite@^0.4.24, iconv-lite@~0.4.13:
   version "0.4.24"
   resolved "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.4.24.tgz#2022b4b25fbddc21d2f524974a474aafe733908b"
   integrity sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==
@@ -5766,7 +5756,7 @@ inherits@2.0.3:
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
   integrity sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=
 
-ini@^1.3.2, ini@^1.3.4, ini@~1.3.0:
+ini@^1.3.2, ini@^1.3.4:
   version "1.3.5"
   resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.5.tgz#eee25f56db1c9ec6085e0c22778083f596abf927"
   integrity sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==
@@ -7529,15 +7519,6 @@ napi-macros@~2.0.0:
   resolved "https://registry.yarnpkg.com/napi-macros/-/napi-macros-2.0.0.tgz#2b6bae421e7b96eb687aa6c77a7858640670001b"
   integrity sha512-A0xLykHtARfueITVDernsAWdtIMbOJgKgcluwENp3AlsKN/PloyO10HtmoqnFAQAcxPkgZN7wdfPfEd0zNGxbg==
 
-needle@^2.2.1:
-  version "2.3.2"
-  resolved "https://registry.yarnpkg.com/needle/-/needle-2.3.2.tgz#3342dea100b7160960a450dc8c22160ac712a528"
-  integrity sha512-DUzITvPVDUy6vczKKYTnWc/pBZ0EnjMJnQ3y+Jo5zfKFimJs7S3HFCxCRZYB9FUZcrzUQr3WsmvZgddMEIZv6w==
-  dependencies:
-    debug "^3.2.6"
-    iconv-lite "^0.4.4"
-    sax "^1.2.4"
-
 negotiator@0.6.2:
   version "0.6.2"
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.2.tgz#feacf7ccf525a77ae9634436a64883ffeca346fb"
@@ -7615,22 +7596,6 @@ node-gyp@^5.0.2:
     tar "^4.4.12"
     which "^1.3.1"
 
-node-pre-gyp@*:
-  version "0.14.0"
-  resolved "https://registry.yarnpkg.com/node-pre-gyp/-/node-pre-gyp-0.14.0.tgz#9a0596533b877289bcad4e143982ca3d904ddc83"
-  integrity sha512-+CvDC7ZttU/sSt9rFjix/P05iS43qHCOOGzcr3Ry99bXG7VX953+vFyEuph/tfqoYu8dttBkE86JSKBO2OzcxA==
-  dependencies:
-    detect-libc "^1.0.2"
-    mkdirp "^0.5.1"
-    needle "^2.2.1"
-    nopt "^4.0.1"
-    npm-packlist "^1.1.6"
-    npmlog "^4.0.2"
-    rc "^1.2.7"
-    rimraf "^2.6.1"
-    semver "^5.3.0"
-    tar "^4.4.2"
-
 nopt@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/nopt/-/nopt-4.0.1.tgz#d0d4685afd5415193c8c7505602d0d17cd64474d"
@@ -7714,7 +7679,7 @@ npm-normalize-package-bin@^1.0.0, npm-normalize-package-bin@^1.0.1:
     semver "^5.6.0"
     validate-npm-package-name "^3.0.0"
 
-npm-packlist@^1.1.6, npm-packlist@^1.4.4:
+npm-packlist@^1.4.4:
   version "1.4.8"
   resolved "https://registry.yarnpkg.com/npm-packlist/-/npm-packlist-1.4.8.tgz#56ee6cc135b9f98ad3d51c1c95da22bbb9b2ef3e"
   integrity sha512-5+AZgwru5IevF5ZdnFglB5wNlHG1AOOuw28WhUq8/8emhBmLv6jX5by4WJCh7lW0uSYZYS6DXqIsyZVIXRZU9A==
@@ -7739,7 +7704,7 @@ npm-run-path@^2.0.0:
   dependencies:
     path-key "^2.0.0"
 
-npmlog@^4.0.2, npmlog@^4.1.2:
+npmlog@^4.1.2:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/npmlog/-/npmlog-4.1.2.tgz#08a7f2a8bf734604779a9efa4ad5cc717abb954b"
   integrity sha512-2uUqazuKlTaSI/dC8AzicUck7+IrEaOnN/e0jd3Xtt1KcGpwx30v50mL7oPyr/h9bL3E4aZccVwpwP+5W9Vjkg==
@@ -8604,16 +8569,6 @@ raw-body@2.4.0:
     iconv-lite "0.4.24"
     unpipe "1.0.0"
 
-rc@^1.2.7:
-  version "1.2.8"
-  resolved "https://registry.yarnpkg.com/rc/-/rc-1.2.8.tgz#cd924bf5200a075b83c188cd6b9e211b7fc0d3ed"
-  integrity sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==
-  dependencies:
-    deep-extend "^0.6.0"
-    ini "~1.3.0"
-    minimist "^1.2.0"
-    strip-json-comments "~2.0.1"
-
 read-cmd-shim@^1.0.1:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/read-cmd-shim/-/read-cmd-shim-1.0.5.tgz#87e43eba50098ba5a32d0ceb583ab8e43b961c16"
@@ -9012,7 +8967,7 @@ retry@^0.10.0:
   resolved "https://registry.yarnpkg.com/retry/-/retry-0.10.1.tgz#e76388d217992c252750241d3d3956fed98d8ff4"
   integrity sha1-52OI0heZLCUnUCQdPTlW/tmNj/Q=
 
-rimraf@2, rimraf@^2.2.8, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2, rimraf@^2.6.3:
+rimraf@2, rimraf@^2.2.8, rimraf@^2.5.4, rimraf@^2.6.2, rimraf@^2.6.3:
   version "2.7.1"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.7.1.tgz#35797f13a7fdadc566142c29d4f07ccad483e3ec"
   integrity sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==
@@ -9089,11 +9044,6 @@ safe-regex@^1.1.0:
   resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
   integrity sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==
 
-sax@^1.2.4:
-  version "1.2.4"
-  resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
-  integrity sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==
-
 scrypt-js@2.0.3:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/scrypt-js/-/scrypt-js-2.0.3.tgz#bb0040be03043da9a012a2cea9fc9f852cfc87d4"
@@ -9748,7 +9698,7 @@ strip-indent@^2.0.0:
   resolved "https://registry.yarnpkg.com/strip-indent/-/strip-indent-2.0.0.tgz#5ef8db295d01e6ed6cbf7aab96998d7822527b68"
   integrity sha1-XvjbKV0B5u1sv3qrlpmNeCJSe2g=
 
-strip-json-comments@2.0.1, strip-json-comments@~2.0.1:
+strip-json-comments@2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
   integrity sha1-PFMZQukIwml8DsNEhYwobHygpgo=
@@ -9887,7 +9837,7 @@ tar@^2.1.1:
     fstream "^1.0.12"
     inherits "2"
 
-tar@^4.0.2, tar@^4.4.10, tar@^4.4.12, tar@^4.4.2, tar@^4.4.8:
+tar@^4.0.2, tar@^4.4.10, tar@^4.4.12, tar@^4.4.8:
   version "4.4.13"
   resolved "https://registry.yarnpkg.com/tar/-/tar-4.4.13.tgz#43b364bc52888d555298637b10d60790254ab525"
   integrity sha512-w2VwSrBoHa5BsSyH+KxEqeQBAllHhccyMFVHtGtdMpF4W7IRWfZjFiQceJPChOeTsSDVUpER2T8FA93pr0L+QA==