{
  "manageEntity": {
    "action": "Save",
    "entityId": "463421",
    "entityType": "Track",
    "nonce": "0xfe8395b65a52e343cd698d1150d561bde05e0c2d5778bda2f770b21825ab7d61",
    "signature": "0xbbe304c05d0d8b562238f4ddeddcd50d74e7ddf207325d87fdae3da746eb5d03585019971c58181a5fb1f469ebb41a200e8a672a375fdc1282cc92617bb64f341b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}