Cannot store files more than 2MB in size.

Question

I have changed max-std-tx-size, max-std-op-return-size and maximum-block-size. Still cannot store data more than 2MB. I even increased target-block-time. still cannot upload more than 2MB. Please help.

Answer 1

Please confirm which version of MultiChain you're using, post the output of getblockchainparams, and show the steps you are taking and the error you are getting.

Comments

I used the latest version of multichain (multichain-1.0-beta-2). The params.dat file has the following in it:

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# Basic chain parameters

chain-protocol = multichain             # Chain protocol: multichain (permissions, native assets) or bitcoin
chain-description = MultiChain genichain # Chain description, embedded in genesis block coinbase, max 256 chars.
root-stream-name = root                 # Root stream name, blank means no root stream.
root-stream-open = false                # Allow anyone to publish in root stream
chain-is-testnet = false                # Content of the 'testnet' field of API responses, for compatibility.
target-block-time = 86400               # Target time between blocks (transaction confirmation delay), seconds. (2 - 86400)
maximum-block-size = 1000000000         # Maximum block size in bytes. (1000 - 1000000000)

# Global permissions

anyone-can-connect = false              # Anyone can connect, i.e. a publicly readable blockchain.
anyone-can-send = false                 # Anyone can send, i.e. transaction signing not restricted by address.
anyone-can-receive = false              # Anyone can receive, i.e. transaction outputs not restricted by address.
anyone-can-receive-empty = true         # Anyone can receive empty output, i.e. without permission grants, asset transfers and zero native currency.
anyone-can-create = false               # Anyone can create new streams.
anyone-can-issue = false                # Anyone can issue new native assets.
anyone-can-mine = false                 # Anyone can mine blocks (confirm transactions).
anyone-can-activate = false             # Anyone can grant or revoke connect, send and receive permissions.
anyone-can-admin = false                # Anyone can grant or revoke all permissions.
support-miner-precheck = true           # Require special metadata output with cached scriptPubKey for input, to support advanced miner checks.
allow-p2sh-outputs = true               # Allow pay-to-scripthash (P2SH) scripts, often used for multisig.
allow-multisig-outputs = true           # Allow bare multisignature scripts, rarely used but still supported.

# Consensus requirements

setup-first-blocks = 60                 # Length of initial setup phase in blocks, in which mining-diversity,
                                        # admin-consensus-* and mining-requires-peers are not applied. (1 - 31536000)
mining-diversity = 0.3                  # Miners must wait <mining-diversity>*<active miners> between blocks. (0 - 1)
admin-consensus-admin = 0.5             # <admin-consensus-admin>*<active admins> needed to change admin perms. (0 - 1)
admin-consensus-activate = 0.5          # <admin-consensus-activate>*<active admins> to change activate perms. (0 - 1)
admin-consensus-mine = 0.5              # <admin-consensus-mine>*<active admins> to change mining permissions. (0 - 1)
admin-consensus-create = 0.0            # <admin-consensus-issue>*<active admins> to change create permissions. (0 - 1)
admin-consensus-issue = 0.0             # <admin-consensus-issue>*<active admins> to change issue permissions. (0 - 1)

# Defaults for node runtime parameters

lock-admin-mine-rounds = 10             # Ignore forks that reverse changes in admin or mine permissions after this many mining rounds have passed. Integer only. (0 - 10000)
mining-requires-peers = true            # Nodes only mine blocks if connected to other nodes (ignored if only one permitted miner).
mine-empty-rounds = 10                  # Mine this many rounds of empty blocks before pausing to wait for new transactions. If negative, continue indefinitely (ignored if target-adjust-freq>0). Non-integer allowed. (-1 - 1000)
mining-turnover = 0.5                   # Prefer pure round robin between a subset of active miners to minimize forks (0.0) or random equal participation for all permitted miners (1.0). (0 - 1)

# Native blockchain currency (likely not required)

initial-block-reward = 0                # Initial block mining reward in raw native currency units. (0 - 1000000000000000000)
first-block-reward = -1                 # Different mining reward for first block only, ignored if negative. (-1 - 1000000000000000000)
reward-halving-interval = 52560000      # Interval for halving of mining rewards, in blocks. (60 - 4294967295)
reward-spendable-delay = 1              # Delay before mining reward can be spent, in blocks. (1 - 100000)
minimum-per-output = 0                  # Minimum native currency per output (anti-dust), in raw units.
                                        # If set to -1, this is calculated from minimum-relay-fee. (-1 - 1000000000)
maximum-per-output = 100000000000000    # Maximum native currency per output, in raw units. (0 - 1000000000000000000)
minimum-relay-fee = 0                   # Minimum transaction fee, in raw units of native currency. (0 - 1000000000)
native-currency-multiple = 100000000    # Number of raw units of native currency per display unit. (0 - 1000000000)

# Advanced mining parameters

skip-pow-check = false                  # Skip checking whether block hashes demonstrate proof of work.
pow-minimum-bits = 8                    # Initial and minimum proof of work difficulty, in leading zero bits. (1 - 32)
target-adjust-freq = 172800             # Interval between proof of work difficulty adjustments, in seconds, if negative - never adjusted. (-1 - 4294967295)
allow-min-difficulty-blocks = true      # Allow lower difficulty blocks if none after 2*<target-block-time>.

# Standard transaction definitions

only-accept-std-txs = true              # Only accept and relay transactions which qualify as 'standard'.
max-std-tx-size = 100000000             # Maximum size of standard transactions, in bytes. (1024 - 100000000)
max-std-op-returns-count = 1024         # Maximum number of OP_RETURN metadata outputs in standard transactions. (0 - 1024)
max-std-op-return-size = 20971520       # Maximum size of OP_RETURN metadata in standard transactions, in bytes. (0 - 67108864)
max-std-op-drops-count = 100            # Maximum number of OP_DROPs per output in standard transactions. (0 - 100)
max-std-element-size = 32768            # Maximum size of data elements in standard transactions, in bytes. (128 - 32768)

# The following parameters were generated by multichain-util.
# They SHOULD ONLY BE EDITED IF YOU KNOW WHAT YOU ARE DOING.

default-network-port = 61172            # Default TCP/IP port for peer-to-peer connection with other nodes.
default-rpc-port = 15590                # Default TCP/IP port for incoming JSON-RPC API requests.
chain-name = genichain                  # Chain name, used as first argument for multichaind and multichain-cli.
protocol-version = 10007                # Protocol version at the moment of blockchain genesis.
network-message-start = fbdefdeb        # Magic value sent as the first 4 bytes of every peer-to-peer message.
address-pubkeyhash-version = 0082fa66   # Version bytes used for pay-to-pubkeyhash addresses.
address-scripthash-version = 05936a2e   # Version bytes used for pay-to-scripthash addresses.
private-key-version = 80bce16a          # Version bytes used for exporting private keys.
address-checksum-value = fb9f0e7d       # Bytes used for XOR in address checksum calculation.



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The issue I'm seeing is in the multichain web demo, when I upload files upto 2048B I can see my file on the view streams page. But 2049B onwards there is no Information there.
Picture: http://34.212.6.159/multichain.png

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Your issue is probably with your PHP configuration, which has a maximum upload size defined in the .ini file. See upload_max_filesize here: http://php.net/manual/en/ini.core.php