SignedTransaction(ctx: CoreTransaction, sigs: List<TransactionSignature>)
SignedTransaction(txBits: SerializedBytes<CoreTransaction>, sigs: List<TransactionSignature>)
SignedTransaction wraps a serialized WireTransaction. It contains one or more signatures, each one for a public key (including composite keys) that is mentioned inside a transaction command. SignedTransaction is the top level transaction type and the type most frequently passed around the network and stored. The identity of a transaction is the hash of Merkle root of a WireTransaction, therefore if you are storing data keyed by WT hash be aware that multiple different STs may map to the same key (and they could be different in important ways, like validity!). The signatures on a SignedTransaction might be invalid or missing: the type does not imply validity. A transaction ID should be the hash of the WireTransaction Merkle tree root. Thus adding or removing a signature does not change it.
sigs - a list of signatures from individual (non-composite) public keys. This is passed as a list of signatures
when verifying composite key signatures, but may be used as individual signatures where a single key is expected to
sign.