{
  "manageEntity": {
    "action": "Save",
    "entityId": "1549122045",
    "entityType": "Track",
    "nonce": "0x50c9c3cbac4769955ae2d9acc4fc98e1dbbdaa5d4ce68216b12fda49f8d3a9bd",
    "signature": "0xcecaa9f6fd6260aa371af5bf705c1a99e9033c7fd7347e9e30cedad4e42234a1710c01ad576dc8aa978084e6e823080e8dd8bc956ea80dc3df1d4f58927f6e4d1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}