{
  "manageEntity": {
    "action": "Save",
    "entityId": "1680671865",
    "entityType": "Track",
    "nonce": "0x86afc06fc5e2eadea164ba0c3558ed5b5a501a08adb0a24676582a5fdb470063",
    "signature": "0x98bb85638d5e5a27a90a766d556f1ce191369fa782578f171fb48c0248fd600671eb852ecef3cc97eca32f9e2667bead21c52911463809c258a2c2c307e50f9c1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}