{
  "manageEntity": {
    "action": "Save",
    "entityId": "745830996",
    "entityType": "Track",
    "nonce": "0x48e4a919d5c9ff8a9cfae494708d54077bd149fb9f08dc00949a680e9ac1bfe7",
    "signature": "0xd778e4d264f36890a56f38920c1a66be190f8d90afec1e8ed31b288f62825825669eb36ed715f4abb6f765e78bea353fef22914614ff2f00c7e5c77605ac24301c",
    "signer": "0x48c57b64a5a12Dc7C7742Fdb629EEce52FF5591D",
    "userId": "930634116"
  }
}