{
  "manageEntity": {
    "action": "Save",
    "entityId": "371994",
    "entityType": "Track",
    "nonce": "0x715c2b3abd8e0a137386030743682a2a65c3306dcaaac5505df1b735164d852d",
    "signature": "0x40476c8cd9355ab55703427e8e14466fffbdb1dd0537803f59284ed1dfcecd7028b01f7cdf1b1eaadcd8de55199c600d4faa3208bf9169542ee3062e3fb4a8a31c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}