US Patent 10404471 Secure ledger assurance tokenization

In a system and methods for secure ledger assurance tokenization, a request circuit is structured to access a first block of a first blockchain. The first block includes a first block identifier of the first blockchain and first block content. The request circuit is structured to audit the first block content so as to generate a first audit result. A secure ledger assurance token (SLAT) generation circuit is structured to generate a first SLAT, the first SLAT comprising the first block identifier of the first blockchain and the first audit result. The cryptographic circuit is structured to cryptographically protect the first SLAT. The SLAT generation circuit stores the cryptographically protected first SLAT in a journal, where the cryptographically protected first SLAT is accessible by an authorized stakeholder to provide integrity and origin authenticity of the first audit result. In some embodiments, an audit anchor is associated with a SLAT and the content of the first blockchain is pruned up to the point defined by the audit anchor.