{
  "manageEntity": {
    "action": "Save",
    "entityId": "1548634841",
    "entityType": "Track",
    "nonce": "0xe84386f8f7b8d10794a46d8a8bb1cc3cdc6005cae6ff74e1286f2eab87c4d3f7",
    "signature": "0xd5939d46a6d433b1a5615a6e2867790e1d96e5132b4557e4559df3fa4b11c0ef5736d28b2b44378f4485560c8b834d3fa3ec74e213a1da705941b262d3efb36e1c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}