{
  "manageEntity": {
    "action": "Save",
    "entityId": "456713033",
    "entityType": "Track",
    "nonce": "0xd8c25a004d6b8c8aee058326fe9cd79474c57756d0d8ce910b27a2f216dfccfe",
    "signature": "0x7841560b7b505b305f0e5dba5e839cb2dc0c01ef3bdbdedce0e8a4766b6cb53e6f2b8e0675b10953b01978cbc268efc6ee4e146c2db01f99297a8e9112a4e2361c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}