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Reference

UR and CBOR primerHow a CBOR payload becomes Bytewords, frames and a QR code, and the CBOR tags BitTool Signer uses.Test vectorsEvery example on this site as JSON, generated by the BitTool Signer engine.Limits and errorsSize limits, rejected inputs, and what the user sees when a request is refused.CompatibilityWallets known to import BitTool Signer accounts and scan its signatures.

UR types at a glance​

UR typeDirectionBodyPage
bytesSigner → walletByte string holding the canonical CBOR pairing mapWallet level
crypto-accountSigner → wallet{1: fingerprint, 2: [descriptor]}Coin level
crypto-hdkeySigner → walletHD key mapCoin level
crypto-multi-accountsSigner → wallet{1: fingerprint, 2: [hdkey], 3: device, 5: version}Coin level
crypto-psbt, psbtBothByte string holding the PSBTBitcoin
eth-sign-request → eth-signatureWallet → signer → walletInteger-keyed mapsEVM
tron-sign-request → tron-signatureWallet → signer → walletInteger-keyed mapsTRON
sol-sign-request → sol-signatureWallet → signer → walletInteger-keyed mapsSolana

Standards​