{
  "manageEntity": {
    "action": "Save",
    "entityId": "74315379",
    "entityType": "Track",
    "nonce": "0x3343b4017801ac63e2ffe291a76c45a3aae246fcffa463230b5b933590c8e457",
    "signature": "0x2336bde6f7a9f507fc8a947200f58fc166a28797701b32492c508ac09b58771457ac171fad393e3153e1ea4a1999e8e8d0927fed64c85596d76430e0e6067cc01c",
    "signer": "0x78bDC2F059DaA68F1424A1539Ce38d5C83d8DD4c",
    "userId": "4686"
  }
}