Bitcore is a infrastructure to build Bitcoin and blockchain-based applications for the next generation of financial technology. It is a full bitcoin node, your apps run directly on the peer-to-peer network. For wallet application development, additional indexes have been added into Bitcoin for querying address balances, transaction history, and unspent outputs.

bitcore - A full stack for bitcoin and blockchain-based applications

Bit is Python's fastest Bitcoin library and was designed from the beginning to feel intuitive, be effortless to use, and have readable source code. 
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Its features include: <BR>
<ul>
<li>Python's fastest available implementation (100x faster than closest library)</li>
<li>Seamless integration with existing server setups</li>
<li>Supports keys in cold storage</li>
<li>Fully supports 25 different currencies</li>
<li>First class support for storing data in the blockchain</li>
<li>Deterministic signatures via RFC 6979</li>
<li>Access to the blockchain (and testnet chain) through multiple APIs for redundancy</li>
<li>Exchange rate API, with optional caching</li>
<li>Optimal transaction fee API, with optional caching</li>
<li>Compressed public keys by default</li>
<li>Multiple representations of private keys; WIF, PEM, DER, etc.</li>
<li>Standard P2PKH transactions</li>
</ul>

Bit is Python's fastest Bitcoin library and was designed from the beginning to feel intuitive, be effortless to use, and have readable source code. 

Bit - Bitcoin made easy.

Copay is a secure bitcoin wallet platform for both desktop and mobile devices. The Copay app securely stores multiple, distinct bitcoin wallets, allowing both business and privacy-conscious users to keep funds carefully separated. It makes sharing a wallet simple and secure. It is one of the first bitcoin wallets to support the full Bitcoin Payment Protocol (BIP 0070-0073). 
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When you send money to a Payment Protocol-enabled merchant, Copay securely verifies that your payment will go to the right place. It has support for over 150 currency pricing options and unit denomination in BTC or bits.

Copay is a secure bitcoin wallet platform for both desktop and mobile devices. The Copay app securely stores multiple, distinct bitcoin wallets, allowing both business and privacy-conscious users to keep funds carefully separated. It makes sharing a wallet simple and secure. It is one of the first bitcoin wallets to support the full Bitcoin Payment Protocol (BIP 0070-0073). 

Copay - The Secure, Shared Bitcoin Wallet

Bcoin is an alternative implementation of the bitcoin protocol, written in node.js. Although still in a beta state, bcoin is well tested and aware of all known consensus rules. It is currently used in production as the consensus backend and wallet system for purse.io.

Bcoin - Javascript bitcoin library for node.js and browsers

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bitcore - A full stack for bitcoin and blockchain-based applications

Bit - Bitcoin made easy.

Copay - The Secure, Shared Bitcoin Wallet

Bcoin - Javascript bitcoin library for node.js and browsers

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bitcore - A full stack for bitcoin and blockchain-based applications

Bit - Bitcoin made easy.

Copay - The Secure, Shared Bitcoin Wallet

Bcoin - Javascript bitcoin library for node.js and browsers

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