{"uri":"at://did:web:lexicon.atcr.io/com.atproto.lexicon.schema/io.atcr.hold.initiateUpload","cid":"bafyreigw67w7huubzrxogure2zmyuiqqdmoydnozf46cwfsaltgad7nspi","value":{"id":"io.atcr.hold.initiateUpload","defs":{"main":{"type":"procedure","input":{"schema":{"type":"object","required":["digest"],"properties":{"digest":{"type":"string","maxLength":128,"description":"The blob digest (e.g., sha256:abc123...)"}}},"encoding":"application/json"},"errors":[{"name":"InvalidDigest"}],"output":{"schema":{"type":"object","required":["uploadId"],"properties":{"uploadId":{"type":"string","maxLength":256,"description":"Unique identifier for this upload session"}}},"encoding":"application/json"},"description":"Start a new multipart upload session for an OCI blob. Returns an uploadId to be used with subsequent part upload and completion endpoints."}},"$type":"com.atproto.lexicon.schema","lexicon":1}}