{
  "manageEntity": {
    "action": "Save",
    "entityId": "354546637",
    "entityType": "Track",
    "nonce": "0xd6a6ab0eb99f74665f6bc13dcf7fdd5c776292be5240d2a8366a63baafd82170",
    "signature": "0xd657a3797ebdbf706bda05540936695b94e08dc8cb3a8a1866ab3eda230a72cb13d83adebe100ee58e4043c30b0d6bca09ba137f79805f560e76bdcff1f018e51b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}