{
  "manageEntity": {
    "action": "Save",
    "entityId": "620955",
    "entityType": "Track",
    "nonce": "0x30ce831d05c2d349df0b4ddb8e58e8ba0deae3fff82466a963394bf773ef21b2",
    "signature": "0x0fad9c511ac7120fefd92be2ec4b31b27df91d44157f2dd650ed197c4ba4275e7456d84fcbfb99eec8482010f285eb6a7fe505a7242637c1e274dc3b169597671c",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}