{
  "manageEntity": {
    "action": "Save",
    "entityId": "720974345",
    "entityType": "Track",
    "nonce": "0x20d10dabad9afdf5ba0ec066d36b66d4881adf152d204ada0dde5d625c4cecb2",
    "signature": "0x4e8f9b866ba1f5b59b711767c870170a9f79a455e7dfc84e985d7234c03c2a1e694f091cf9a314e56c9b7f3830886445541771c188b8fdd66eee9dd32dd569611c",
    "signer": "0x742Fff9be20F80Ce7285c8Ab12B9018Ef3Cf14F0",
    "userId": "111467392"
  }
}