Segwit2x developers: Bitcoin upgrade at block 494,784

Segwit2x developers confirm that the Bitcoin upgrade is to happen at block 494,784
17 August 2017   1467

Segregated Witness support has been locked-in as a soft fork expected to activate around August 23rd, 2017 (block height 481,824).

Now Segwit2x developers confirm that the Bitcoin upgrade is to happen at block 494,784.

During the month of November 2017, approximately 90 days after the activation of Segregated Witnesses in the Bitcoin blockchain, a block between 1MB and 2MB in size will be generated by Bitcoin miners in a move to increase network capacity. At this point it is expected that more than 90% of the computational capacity that secures the Bitcoin network will carry on mining on top of this large block.

Jeff Garzik
Segwit2x developer

According to the report, the November 2017 upgrade to 2MB blocks is a hard-fork, but necessary changes are trivial to perform. Some SPV clients are expected to work without any change at all. Most clients will need to tweak only two constants to remain compatible with the new larger blocks:

For SegWit-compatible clients:

  • Maximum block weight doubles from 4,000,000 to 8,000,000
  • Sig-ops per block doubles from 80,000 to 160,000

For non-SegWit-capable clients:

  • Maximum base block size doubles from 1,000,000 to 2,000,000
  • Sig-ops per block doubles from 20,000 to 40,000

Both types of clients should add new DNS seeds:

  • BitPay:
  • OB1:
  • Blockchain:
  • Bloq:


For testing purposes, a new Testnet5 network that builds on the same Genesis block as the existing Testnet3 network has been created, as the report claims. In order to update a client for compatibility with Testnet5, do these changes to existing Testnet3 settings:

  • Port changes from 18333 to 18555.
  • Network magic changes from 0x0b110907 to 0x6e657400
  • BIP-34, BIP-66, BIP-65 and single checkpoint all refer to the block at height 10001 with hash 00000000fb7c0a2aeb5f1244e81921b84b7ac770004543144e10c2284f89bfd8
  • DNS seeds are available at and

Block size/weight and sig-ops changes above also apply to Testnet5.

Compatible Fully-Validating Node Software

Incompatible Fully-Validating Node Software

Crypto Investor to File Lawsuit Against AT&T

Michael Terpin believes that AT&T helped scammers to still his $24M worth crypto
16 August 2018   120

In the Los Angeles District Court, a 69-page lawsuit was filed by BitAngels founder Michael Terpin against the American telecom giant AT&T. Terpin claims that the operator assisted fraudsters in "stealing digital personal data" from the account on his smartphone, which is why he lost $ 24 million in cryptocurrency, according to an official release.

According to Terpin, for seven months, there were two hacks. Initially, an attacker got access to his phone number without providing a password or correct identification data. Later, the phone number was used to steal crypto.

AT&T’s studied indifference to protecting its customers’ privacy and financial assets is a metastasizing cancer, threatening hundreds of millions of unsuspecting AT&T’s customers. Our client had no idea when he initially signed up, nor when later he was promised the highest level of security for his account, that low-level retail employees with access to AT&T records, or people posing as them, can be bribed by criminals to override every system that AT&T advertises as unassailable.

Pierce O’Donnell
Lead counsel for Terpin in this complaint

Michael Terpin requires AT & T to pay him $ 224 million - $ 200 million for moral damages and $ 24 million for actual theft.