{
  "manageEntity": {
    "action": "Save",
    "entityId": "221402",
    "entityType": "Track",
    "nonce": "0x9ac5ae2db4fe3fb499de7e39688a1ce494c3aacec2dcf229cae74aa098ad2830",
    "signature": "0x0f45b144f8bad1d5177c7f658b3d5ad24ef23d8f29e30895b6831b464a833f8408eca29b03e376ed63434aa63f377e9106ba6cf0c9fa88e00fc9874256dd225b1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}