{
  "manageEntity": {
    "action": "Save",
    "entityId": "470190029",
    "entityType": "Track",
    "nonce": "0x9dbad35e9c84200266e0ba93f84df5d3b2c13f5b5035adff653b76c54171ce42",
    "signature": "0xcd0998638ea3e9386a2af458883cfdf84ff2b3011fc5a398e8a0f4b5b03a9a425c02b03ebc18f19896393264cadeb02776f5bbddf6450362531f5ae4b67d09d31b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}