{
  "manageEntity": {
    "action": "Save",
    "entityId": "737743",
    "entityType": "Track",
    "nonce": "0xe20ef89a8ec71cbb4b3fbb474cbb161ba18dd942dd48174464ecf71d9635ad95",
    "signature": "0xeea11a7f73cc5e345090c881289d7074ae3e0b982b40d08cb649561e579682522b25f64c02e80bfba849476cbacd89bacb48ae2dd3def42a22cd91298b42d7981c",
    "signer": "0xC2A9E3b7F06e60ef97DFB73522582B613021cf7A",
    "userId": "265825696"
  }
}