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{{#seo:
|title=Simplified Payment Verification (SPV) – zaoniao Wiki
|keywords=spv, simplified payment verification, wallet, bitcoin
|description=Simplified Payment Verification (SPV) – using Bitcoin without running a full network node.
}}
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[[File:Simplified-payment-verification.svg|550px|right|SPV - simplified payment verification - SPV wallet]]
'''Simplified Payment Verification''' ('''SPV''') – using Bitcoin without running a full [[network]] node. By default, upon receiving a new transaction a node must validate it: in particular, verify that none of the [[transaction]]'s inputs have been previously spent. To carry out that check the node needs to access the blockchain. Any user who does not trust his network neighbors, should keep a full local copy of the blockchain, so that any input can be verified.

As noted in [[Satoshi Nakamoto|Nakamoto]]'s whitepaper, it is possible to verify bitcoin payments without running a full network node. And this is called simplified payment verification or SPV. A user or user’s bitcoin spv wallet only needs a copy of the block headers of the longest chain, which are available by querying network [[node]]s until it is apparent that the longest chain has been obtained. Then, wallet using spv client get the Merkle branch linking the transaction to its block. Linking the transaction to a place in the active chain demonstrates that a network node has accepted it, and blocks added after it further establish the confirmation.

==Simplified Payment Verification (SPV) and SPV Wallet==
The main you need to know whe you asked «what is SPV Wallet»: SPV it’s not a developers or brand name, it’s a technology. SPV means simplified payment verification. And there is anything new in it – it was mentioned in orgiginal Bitcoin [[Whitepaper]] by Satoshi Nakamoto (section 8). In a nutshell, SPV lets you validate your transactions without having to worry about anybody else’s transactions. It ensures your transactions are in a block, and it provides confirmations (proof of work) that additional blocks are being added to the chain. So, SPV wallet definition it is the same as «hot wallet» or «cold wallet» - it’s a type of bitcoin wallets, ensures your security and your data in active chain.

==Bitcoin SPV wallet client==
There are some wallets on GitHub which called themself Bitcoin SPV wallet client.
* '''Native Bitcoin SPV client''', but it is still experimental and you do not want to use it in production environments today, as developers written at GitHub. BitcoinSPV is still a work-in-progress and will eventually undergo huge modifications. Several basic things are left to do.
* '''Modified SPV wallet client for bitcoin''', using [[Lightning Network]], OpenBazaar and btcd developments.

==API wallet vs SPV wallet==
According to Nadav Ivgi, founder of Bitrated, at the end of 2017th most popular wallets used centralized API servers to fetch blockchain data. The ones that use SPV are exceptional - [[Bread Wallet]] and Android Bitcoin Wallet are the only popular SPV wallets.

==See also==
* [[Cloud mining]]
* [[Buying Bitcoin]]
* [[Smart contract builder]]
* [[Cryptocurrency dust]]
* [[Vitalik Buterin]]
* [[Gavin Andresen]]

[[de:Vereinfachte Zahlungsuberprufung]]

[[Category:Bitcoin client]]
[[Category:Bitcoin wallet]]
[[Category:Technology]]

Simplified Payment Verification - Revision history

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