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manolodewiner 2018-01-09 14:22:47 +01:00
parent 018d13ac76
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1 changed files with 36 additions and 28 deletions
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64
_src/_guides/tutorial-token-launch.md
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@ -33,6 +33,8 @@ The code below illustrates how to create a divisible asset with 10 000 tokens as
```js
const nTokens = 10000
let tokensLeft
const tokenCreator = new BigchainDB
.Ed25519Keypair(bip39.mnemonicToSeed('seedPhrase').slice(0,32))
function tokenLaunch() {
// Construct a transaction payload
@ -78,6 +80,10 @@ Tokens can be transferred to an unlimited number of participants. In this exampl
```js
const amountToSend = 200
const newUser = new BigchainDB
.Ed25519Keypair(bip39.mnemonicToSeed('newUserseedPhrase')
.slice(0, 32))
function transferTokens() {
// User who will receive the 200 tokens
const newUser = new BigchainDB.Ed25519Keypair()
@ -86,41 +92,44 @@ function transferTokens() {
// False argument to retrieve unspent outputs
conn.listOutputs(tokenCreator.publicKey, 'false')
.then((txs) => {
// Just one transaction available with outputs not being spent by tokenCreator
// Therefore, txs[0]
// Just one transaction available with outputs not being spent by
// tokenCreator. Therefore, txs[0]
return conn.getTransaction(txs[0].transaction_id)
})
.then((tx) => {
.then((txOutputs) => {
// Create transfer transaction
const createTranfer = BigchainDB.Transaction.makeTransferTransaction
(
tx,
// Metadata (optional)
{
tranfe_to: 'john',
tokens_left: tokensLeft
},
// Transaction output: Two outputs, because the whole input must be spent
[BigchainDB.Transaction.makeOutput(
BigchainDB.Transaction
.makeEd25519Condition(tokenCreator.publicKey),
(tokensLeft - amountToSend).toString()),
BigchainDB.Transaction.makeOutput(
BigchainDB.Transaction
.makeEd25519Condition(newUser.publicKey), amountToSend)
],
// Index of the input being spent
0
)
const createTranfer = BigchainDB.Transaction
.makeTransferTransaction(
[{
tx: txOutputs,
output_index: 0
}],
// Transaction output: Two outputs, because the whole input
// must be spent
[BigchainDB.Transaction.makeOutput(
BigchainDB.Transaction
.makeEd25519Condition(tokenCreator.publicKey),
(tokensLeft - amountToSend).toString()),
BigchainDB.Transaction.makeOutput(
BigchainDB.Transaction
.makeEd25519Condition(newUser.publicKey),
amountToSend)
],
// Metadata (optional)
{
tranfe_to: 'john',
tokens_left: tokensLeft
}
)
// Sign the transaction with the tokenCreator key
const signedTransfer = BigchainDB.Transaction
.signTransaction(createTranfer, tokenCreator.privateKey)
.signTransaction(createTranfer, tokenCreator.privateKey)
return conn.postTransaction(signedTransfer)
})
.then((signedTransfer) => conn
.pollStatusAndFetchTransaction(signedTransfer.id))
.pollStatusAndFetchTransaction(signedTransfer.id))
.then(res => {
// Update tokensLeft
tokensLeft -= amountToSend
@ -149,12 +158,11 @@ function combineTokens(transaction1, outputIndex1, transaction2, outputIndex2,
tx: transaction2,
output_index: outputIndex2
}],
// Output: Two outputs, the whole input must be spent
// Output
[BigchainDB.Transaction.makeOutput(
BigchainDB.Transaction.makeEd25519Condition(
bestFriend.publicKey),
(totalTokens).toString())],
{
(totalTokens).toString())], {
transfer_to: 'my best friend'
}
)