{
  "manageEntity": {
    "action": "Save",
    "entityId": "904641704",
    "entityType": "Track",
    "nonce": "0xdc3e0400fa3b2f0397548c1aecec7367431f3aeaee0a92e241600f7d58dcd4f0",
    "signature": "0xc81e8a49b2ece110b1f05d34a3336f1bb29791f41042d2dd7949e795e82563c01f480343c1fcde9db05566896b6639149044d9b9be1bbd986eb113a050128db51b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}