{
  "manageEntity": {
    "action": "Save",
    "entityId": "515537075",
    "entityType": "Track",
    "nonce": "0xb7720f95f9c308c56d220f73f32ac6292fc54f6ee25a4442f100437d3d302b58",
    "signature": "0x1cb433d09216234f198640d012af89f263742eaec5e5fb917f62a6ff10ee3b6344a65516b2b894e5e89842055ad26237e3f2afb97ed5b50c9420cbc03a87c40f1b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}