{
  "manageEntity": {
    "action": "Save",
    "entityId": "638239656",
    "entityType": "Track",
    "nonce": "0xba9c90c4c90a6e4c139d2426f7ab39161998757204136735a21cb90161c71490",
    "signature": "0xf5829e6edd8379b1928d4da5d092f336ffcd6e41fb4b0740036d151036c5569140ee76199cea62ce78f197609f02c08468ea13bca31bbcd9cae3661560dbea701c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}