{
  "manageEntity": {
    "action": "Save",
    "entityId": "1913371907",
    "entityType": "Track",
    "nonce": "0xf33e4bb0712487c63ec27cabe74d56187cbfa83ac46653fa4528008d70ead92c",
    "signature": "0xa304e5256da224d74a76e93987782558ad698b09a59ac77ffff95fb6989067845b1558f417746bc2c046c3b465f60af058e7c19ab2feafba531a09c74e23ad251c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}