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How can I verify the public key that I provided was actually used to generate the multisig address I'm funding for say escrow?
How to determine public keys that were used to generate a multisig address?
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A redeem script is generated along with the multisig address. The redeem script can be decoded at https://coinb.in/#verify (for example) to determine the address, the required number of signatures, and a list of the public keys with access. (It will also be used later to release the bitcoins.)
You might want to differentiate between raw multisignature and P2SH multisignature. The former is deprecated and can't sensibly be used on the network anymore. – Anonymous – 2015-06-26T23:48:53.927