I'll take my shot. Experts, please correct me.
"Full" Sync: Gets the block headers, the block bodies, and validates every element from genesis block.
Fast Sync: Gets the block headers, the block bodies, it processes no transactions until current block - 64(*). Then it gets a snapshot state and goes like a full synchronization.
Light Sync: Gets only the ...
Lets take it one step at a time.
Blockchains generally work by having an origin (genesis) state with a few accounts having funds, and then every block that you place on top of the chain moves those origin funds around, also granting a bit of extra for the miner. So whenever you import a new block into your existing chain to take a look at what your view (...
geth and parity have differents methods to save the ethereum blockchain in their internal format. I made many benchs because i find it so long just to use a Wallet.
The pruning mode is how the block data are saved. With the archive mode, all states are saved. So, you know the state at each moment without to reload all the blockchain. With fast and light, we ...
A light server is a full node with "LES server" option enabled. This option is disabled by default (at least as long as the LES implementation is still in experimental stage), so light clients actually DO need a somewhat "special" endpoint. Run
geth --lightserv 25
to allocate max. 25% of CPU resources for serving clients.
Peer discovery is also ...
With each block state (contracts storage and balances) is changing.
By default (archive) we keep in database full state of every block.
With different pruning algorithms we are ditching state data for old blocks maintaing only the parts that are needed. basic/fast/light are just various approaches to that problem with different trade-offs.
geth --fast is ...
Syng Ethereum Client
Syng is currently pre-alpha software, it is only suitable for
interested contributors, although it connects to mainnet by default,
please do not trust it with your ETH. Use at your own risk.
Jaxx Bitcoin & Ethereum Wallet
Jaxx Bitcoin and Ethereum Wallet by Kryptokit - This is the first beta
release of a fleet ...
The light client (LES) is currently only being developed in the Go Ethereum codebase and is currently rounding off the first of two phases.
The first phase consists of the following high level components:
[•] Validating header
[•] Validating state information
[•] Querying state information (accounts, code, nonces, etc.)
[•] Validating receipts
[ ] Sending ...
Ethereum hasn't yet released features which would provide something like SPV. Instead of SPV it will be called Light Client and the protocol for this being developed is called "LES".
More information on the ethereum github wiki.
Besides Browser Solidity (as @Rob Hitchens recommended), you could also develop smart contracts using Brownie. You could implement your smart contracts and test it on its local blockchain, where each transaction will be deploy right away and increment the block number.
Brownie: A python framework for Ethereum smart contract deployment, testing and
I think the most important phrase in your question is 'what is the likelihood'.
The other answers are correct in determining that there is a 1 in 2^160 likelihood of finding a collision with 100% probability.
Due to the birthday paradox, cryptographers give a hash function with output bitlength 160 a bitwise security rating of 80. This is because with 2^80 ...
Short answer: it does not.
Long answer: getting the correct header is the only critical part. Light clients cannot check every state transition, they rely on PoW/PoS. PoS will be a better protection against fraud since signing wrong blocks costs a lot, but PoW is also reliable if we wait a few "confirmation" blocks (light client will have that option).
There is a light client protocol page on the Ethereum wiki. It describes the general concept, and suggests some implementation details.
A light client can be viewed as a client that downloads block headers by default, and verifies only a small portion of what needs to be verified, using a distributed hash table as a database for trie nodes in place of its ...
It is possible to forward arguments to geth via the ethereum wallet by using the --node- prefix .
Use the following command to start the wallet in light mode.
It connects instantly.
It should be possible to create a light node. A full node is probably impossible. Your main limitation is storage space (5Mb for some browsers). This page on the light client protocol specifically mentions extensions, though it's a year old. You would also not want to use too much CPU, as the user wouldn't thank you for running at a high CPU continuously.
That, by default, requires you to run your own web3 instance, you can use this one for starting:
The complete instructions are:
Download the git repo (git clone https://github.com/ConsenSys/eth-lightwallet), enter the eth-lightwallet directory
Install the npm modules (npm install)
Enter the examples directory, open the webwallet.html file
My impression is that SPV nodes cannot be validator nodes for the reason you stated (proof that ETH is securing the chain requires knowledge of blockchain state). With Bitcoin and node can convert to or from a SPV node to a full node (or vise vera) at any time.
SPV nodes can exist with Casper but they cannot be validating PoS nodes. SPV peers essentially ...
Although Geth has always worked on the RPI, we haven't put much effort into optimizing for such low end devices. During the Olympic testnet I did make Geth syncable on the RPI1, but there have been quite massive modifications and it wasn't a priority to keep this platform operationally feasible.
We're currently in the midst of releasing Geth 1.4.6, which ...
Status is a good start to develop a Ethereum mobile dapp.
Status is an open source messaging platform and mobile browser to
interact with decentralized applications that run on the Ethereum
Decentralized Apps at your fingertips: With Status your
mobile device becomes a light client node on the Ethereum Network,
enabling you to ...
You can have parity emulate geth's IPC (ie, pretend to be geth), by running:
parity --light --geth
If you want to be lazy, you can add to your configuration file:
light = true
geth = true
Then start mist as:
mist --syncmode light
If you get a blank screen when mist loads, see here.
full security is only possible for a full node
One reason is that block headers show proof of work, but not proof of valididty. So a light node may receive an invalid block header and assume it is valid. Of course, invalid blocks are just as expensive to produce as valid blocks, without any block ...
Yes it is possible you can connect to a remote node using web3.js
npm: $ npm install web3
bower: $ bower install web3
meteor: $meteor add ethereum:web3
vanilla: link the dist./web3.min.js
Then you need to create a web3 instance, setting a provider. To make sure you don't overwrite the already set provider when in mist, check first if the web3 ...
Jaxx is an Android app that has ethereum functionality. We're working on HD ethereum wallets and will soon have an advanced feature to send data and a custom gas limit to contracts :)
Geth can be run both on Android as well as iOS for about 4 months now. The nightly builds of the develop branch always include the Android .aar archives that you can link against an Android Studio project and the iOS framework that you can use in XCode.
Since Geth does not yet feature the light client functionality (that one actually needs Ethereum global ...
Not at this time. You can use Jaxx and MyEtherWallet to send transactions with data and increased gas, which means you can send ETH to a contract. But fully interact with a custom ABI does not appear on any light / web wallets at this point.
We (MyEtherWallet) are currently working on it. We've done one-offs for Digix and Augur and just implemented the ...
Light clients are on the way for lower power embedded devices. I believe these light clients only get block headers initially, and further data as needed on-demand from full nodes on the Ethereum network. Here are 2 of the light clients that are work-in-progress I am aware of:
Official Ethdev Light Client
In regards to pruning the ...
You can connect to a remote ethereum node such as INFURA, using the JSON RPC API, so you won't need to worry about maintaining and synchronizing a local node.
You can see this guide about using Truffle with INFURA
Disclaimer: INFURA Founder here.