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I've learned a lot today, and I couldn't have gotten this far so quickly without this StackExchange. I've almost got sending worked out, but I can't for the life of me figure out why this is failing at the point of injection with a "unrevealed_key" error.

I am aware that I should decode the forged transaction and reverify the values to ensure the remote node hasn't tried to change my transaction, but I removed that bit from this post for the sake of simplicity.

const send = (from, to, amount, sk) => {



sotez.rpc.getHead()

    .then(head => {

        const operation = {

            branch: head.hash,

            contents: [{

                kind: 'transaction',

                source: from,

                fee: '50000',

                counter: '31204',

                gas_limit: '10200',

                storage_limit: '0',

                amount: amount,

                destination: to,

            }],

        }



        sotez.tezos.forge(head, operation)

            .then(unsigned => {

                const binary = unsigned.opbytes



                sotez.crypto.sign(binary, sk, '0x03')

                    .then(signed => {

                        operation.signature = signed.edsig



                        sotez.rpc.inject(operation, signed.sbytes)

                            .then(result => {

                                console.log(result)

                            })

                    })

            })

    })

}



send('tz1htPf3VPXrHBTX1E7y3tBteib6hA9Teosj', 'tz3WXYtyDUNL91qfiCJtVUX746QpNv5i5ve5', '1000000', 'edskS6KrT1G365PsuQiMVvPgZCS1CKTC5EFc7N...')

Returns: [{"kind":"branch","id":"proto.003-PsddFKi3.contract.unrevealed_key","contract":"tz1htPf3VPXrHBTX1E7y3tBteib6hA9Teosj"}]

Edit:
So I need to reveal this account first. I modified my send method to check if the account has been revealed before, and if not then add the revealing to the list of operations. Now I get {"kind":"permanent","id":"proto.003-PsddFKi3.operation.invalid_signature"}.

const send = (from, to, amount, keys, revealed) => {



tezos.rpc.getHead()

    .then(head => {

        const operation = {

            branch: head.hash,

            contents: [{

                kind: 'transaction',

                source: from,

                fee: '50000',

                counter: '31205',

                gas_limit: '10200',

                storage_limit: '0',

                amount: amount,

                destination: to

            }],

        }



        if (!revealed) {

            operation.contents.unshift({

                kind: 'reveal',

                fee: '1269',

                counter: '31204',

                public_key: keys.pk,

                source: from,

                gas_limit: '10000',

                storage_limit: '0',

            })

        }



        tezos.tezos.forge(head, operation)

            .then(unsigned => {

                const binary = unsigned.opbytes



                tezos.crypto.sign(binary, keys.sk, '0x03')

                    .then(signed => {

                        operation.signature = signed.edsig



                        tezos.rpc.inject(operation, signed.sbytes)

                            .then(result => {

                                console.log(result)

                            })

                    })

            })

    })

}



send('tz1htPf3VPXrHBTX1E7y3tBteib6hA9Teosj', 'tz3WXYtyDUNL91qfiCJtVUX746QpNv5i5ve5', '1000000', keys, false)

Edit2:
This worked, using sendOperation

const send = (from, to, amount, keys) => {



sotez.rpc.getHead()

    .then(head => {

        const operation = {

                kind: 'transaction',

                source: from,

                fee: '50000',

                gas_limit: '10200',

                storage_limit: '0',

                amount: amount,

                destination: to

        }



        const params = {

            from,

            operation,

            keys

        }



        sotez.rpc.sendOperation({from, operation, keys})

            .then(result => {

                console.log(result)

            })

    })

}



send('tz1htPf3VPXrHBTX1E7y3tBteib6hA9Teosj', 'tz3WXYtyDUNL91qfiCJtVUX746QpNv5i5ve5', '1000000', keys)

Before sending transactions from an account, a 'reveal' operation must be made for the account. It looks like this account may have been activated, but not yet revealed. To make this work we would need to include the reveal operation in the list of operations:

sotez.rpc.getHead()

  .then(head => {

    const operation = {

      branch: head.hash,

      contents: [

        {

          kind: 'reveal',

          fee: '1269',

          counter: '31204',

          public_key: keys.pk,

          source: from,

          gas_limit: '10000',

          storage_limit: '0',

        },

        {

          kind: 'transaction',

          source: from,

          fee: '50000',

          counter: '31205',

          gas_limit: '10200',

          storage_limit: '0',

          amount: amount,

          destination: to,

        }

      ],

    }

    ...

  })

After the account has been revealed, the reveal is not needed to be included in the operations thereafter.

SendOperation Answer:

const send = (from, to, amount, keys) => {

  const operation = {

    kind: 'transaction',

    source: from,

    fee: '50000',

    gas_limit: '10200',

    storage_limit: '0',

    amount: `${amount}`,

    destination: to,

  };



  rpc.sendOperation({ from, operation, keys })

    .then(result => console.log(result));

};