Shared Libraries

bitcoinconsensus

The purpose of this library is to make the verification functionality that is critical to Bitcoin's consensus available to other applications, e.g. to language bindings.

API

The interface is defined in the C header bitcoinconsensus.h located in src/script/bitcoinconsensus.h.

Version

bitcoinconsensus_version returns an unsigned int with the the API version (currently at an experimental 0).

Script Validation

bitcoinconsensus_verify_script returns an int with the status of the verification. It will be 1 if the input script correctly spends the previous output scriptPubKey.

Parameters

const unsigned char *scriptPubKey - The previous output script that encumbers spending.
unsigned int scriptPubKeyLen - The number of bytes for the scriptPubKey.
const unsigned char *txTo - The transaction with the input that is spending the previous output.
unsigned int txToLen - The number of bytes for the txTo.
unsigned int nIn - The index of the input in txTo that spends the scriptPubKey.
unsigned int flags - The script validation flags (see below).
bitcoinconsensus_error* err - Will have the error/success code for the operation (see below).

Script Flags

bitcoinconsensus_SCRIPT_FLAGS_VERIFY_NONE
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_P2SH - Evaluate P2SH (BIP16) subscripts
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_DERSIG - Enforce strict DER (BIP66) compliance

Errors

bitcoinconsensus_ERR_OK - No errors with input parameters (see the return value of bitcoinconsensus_verify_script for the verification status)
bitcoinconsensus_ERR_TX_INDEX - An invalid index for txTo
bitcoinconsensus_ERR_TX_SIZE_MISMATCH - txToLen did not match with the size of txTo
bitcoinconsensus_ERR_DESERIALIZE - An error deserializing txTo

Example Implementations

NBitcoin (.NET Bindings)
node-libbitcoinconsensus (Node.js Bindings)
java-libbitcoinconsensus (Java Bindings)
bitcoinconsensus-php (PHP Bindings)

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