{
  "manageEntity": {
    "action": "Save",
    "entityId": "757101",
    "entityType": "Track",
    "nonce": "0x964c0f9e3d261f70a608e58eb506fdf17579f5b4e4afd8442bfba68edf7d0951",
    "signature": "0x5f799b65ae1a471ff521e6f28ea1dc5cde5d452b7362f4e28f651857add4fa1d4eb7a8da4dfb2cfad40876801462673f2c1c69880c0387cb615e7666b56b5f6e1b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}