{
  "manageEntity": {
    "action": "Save",
    "entityId": "147259764",
    "entityType": "Track",
    "nonce": "0x547122866e509e79fe7f32cf2f1a6b7e6ea4bdff69803a4c2fd40b684db0d5a4",
    "signature": "0xef09cd0e56c5b5ee11a395d166da9a766ad030bf5cc4f24ea62c9b654497db864609460c64a32b3e58ef7687c3b71b5713916fbea1591410545b4b9a37e53d7f1c",
    "signer": "0x94e0dDC50579175818AaCFBC9aba8B065fEf2a55",
    "userId": "460147282"
  }
}