{
  "manageEntity": {
    "action": "Save",
    "entityId": "838715313",
    "entityType": "Track",
    "nonce": "0x760465a6bb1a86010a175e1ad0c73dd3b51bc288e2d96d557db7fa4d42d8394a",
    "signature": "0xb1554655a180704144f3cfab81325730c44cb2ab80f7628542c42e8401661e380124ae2479459b3f646a82df07916ec292fe3742328de339800c10caf16020d21c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}