Validate the proof-of-work (PoW) in the object specified as
.I blockRepresentation
with the attribute
.B work
is valid for the block passed in.
.RR

.TP
.B ::nano::block::hash
.I blockData
.RB ? -hex | -binary ?
.RI " -> " blockHash

Compute the cryptographic hash of a block.  The cryptographic hashing
algorithm used for Nano is Blake2b.  Blocks are typically identified
by their hash (i.e., content addressable).
.HB

.TP
.B ::nano::block::signBlockHash
.I blockHash
.I privateKey
.RB ? -hex | -binary ?
.RI " -> " signature

Compute an Ed25519-with-Blake2b signature of a given block hash specified as
.I blockHash
with the private key specified as
.IR privateKey .
In Nano, signed blocks are signed by signing the block's hash thus all that is
needed to sign a block is its hash and the private key that corresponds to the
account.
.B NOTE:  Ensure that the
.I privateKey
.B specified matches the account the block belongs to.
.HB

.TP
.B ::nano::block::sign
.I blockData
.I privateKey
.RB ? -hex | -binary ?
.RI " -> " signature

This is a convenience procedure which computes the hash of a block given as
.IR blockData ,
and then calls
.BR signBlockHash .
.HB

.TP
.B ::nano::block::verifyBlockHash
.I blockHash
.I signature
.I publicKey
.RI " -> " boolean

Verify that a block hash
.RI ( blockHash )
was signed
.RI ( signature )
by an account holding the private key that
corresponds to the public key specified as
.IR publicKey .

.TP
.B ::nano::block::verify
.I blockData
.I signature
.I publicKey
.RI " -> " boolean

This is a convenience procedure which computes the hash of a block given as
.IR blockData ,
and then calls
.BR verifyBlockHash .

.TP
.B ::nano::block::create::send
.BI "from "            address
.BI "to "              address
.BI "previous "        blockHash
.BI "representative "  address
.BI "previousBalance " integer