{
  "manageEntity": {
    "action": "Save",
    "entityId": "1990456574",
    "entityType": "Track",
    "nonce": "0x90afbd1fac9741b533031f37023c82e2cf0a19d4b544dfc1c967489987b2482a",
    "signature": "0xbd229814c8767c4d497d659e8e9d5889c8e77c64e4096702895b73715c880d4e71ac8b9b709e2d4413649729d8fd3a7bff517446a32871af1a1c34c5ef68c9021c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}