{
  "manageEntity": {
    "action": "Save",
    "entityId": "858879503",
    "entityType": "Track",
    "nonce": "0x3274c07763439c335aa0eea7b05a0dc9992e3384fa934eeff6a05af541cfa873",
    "signature": "0xaaf7f33ced7e062568f04f6238b795e0ee7aed3b5096ca2dfb06c34e750657a60be8cbc642a4c68877979298e2d8e91f2ddea4a09a750c298a985c1320d2a6001b",
    "signer": "0xE7A4a8f1d081B44C96Ed68610B6c3016ce8cD6E0",
    "userId": "464427506"
  }
}