{
  "manageEntity": {
    "action": "Save",
    "entityId": "591862",
    "entityType": "Track",
    "nonce": "0xe4bb56fb86bc1d959c1b53d439ecfaca5caac492289e755d1ecb7ec95fe3d6ce",
    "signature": "0x369a78eafdbabf58fbc3e6bac36b4695f6e6095be63650d700eff93cec3c3e420a1a1a62eb2b40280f62e687677a5a83f964accbf96a0ea13e4b631afb0289ae1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}