{
  "manageEntity": {
    "action": "Save",
    "entityId": "1498107242",
    "entityType": "Track",
    "nonce": "0xe8e5e9335ae5bffe59320a41e829f93cf9607979fda03dc798327cbb0819ba0a",
    "signature": "0xb16dc76e9fb9cb8cadf273e80b945b8afbf58a28bfaa3b36233b0bab1bf49baf4a0d0aef85ee1cfec1c45d23d9fbbf9bcaf5cac1f95eb7944d06eaef82e07e0a1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}