Bitcoin Cash Specification

Response: Reject (“reject”)

Notifies peer that a received message is invalid.

Message Format

Field Length Format Description
rejected message type variable variable length string The command string of the message that is being rejected (e.g. “tx”).
rejection code 1 byte rejection code A code indicating why the message was rejected.
rejection reason* variable variable length string A description of why the message was rejected.
rejection data variable rejection code specific Optional extra data provided by rejection codes. For example, those that reject specific objects. Currently, all rejection codes that use this field fill it with the hash of the object being rejected, such as the transaction ID or block header hash, in which case the field is 32 bytes.

* rejection reason is a string providing a human language explanation of the reason the message was rejected. This string is subject to change so client software SHOULD NOT use it programmatically.

Rejection Codes

Name Value Response To Description
REJECT_MALFORMED 0x01 any Message cannot be deserialized.
REJECT_INVALID 0x10 BLOCK, TX, FILTERSIZEXTHIN Block or transaction is invalid, or xthin filter size is too small
REJECT_OBSOLETE 0x11 VERSION This node no longer supports your client protocol version
REJECT_NONSTANDARD 0x40 TX Transaction is non-standard, or not final as per BIP68.
REJECT_DUST 0x41 TX Transaction has an output that is too small.
REJECT_INSUFFICIENTFEE 0x42 TX Transaction does not pay enough in fees to be relayed.