{
  "manageEntity": {
    "action": "Save",
    "entityId": "515861479",
    "entityType": "Track",
    "nonce": "0x921ddb545872fc90528d3762aecf4bdf2f608c9752981bedbc86040fca3cc528",
    "signature": "0x307820151327127ca4fc65b3aa66bc40fd97c88b9a9377609b0f360e0ca6b84b32cb9cfd76cb75cd75a7dfafd550be65f150ba7818dd0a6efe089dbaf36d019b1b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}