{
  "manageEntity": {
    "action": "Save",
    "entityId": "1608668393",
    "entityType": "Track",
    "nonce": "0xe1140547569489f01e77c3aad1bd8daac0be31f256a0171250602660881f515e",
    "signature": "0x57558c4412d0df844f0ec84ee14d2f8bfb4b66cef8fe181cb1995828cc75c9c74b6b79588aa023f86e7126ca45fcf682ec4bc1ef4f11f7c5e803892b5a6cd5e81c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}