{
  "manageEntity": {
    "action": "Save",
    "entityId": "424426213",
    "entityType": "Track",
    "nonce": "0x864f3d16f9cd509b85ac93e6e60a0a7a627ddbbc031a754c1d57ae65f3f607c5",
    "signature": "0xcf2ed13442d3636c33613ece46390a56938af736804da6a018fa8ef2aa028ae34264af7dab113a73548fb04c5400135dc06ecb3b5bc90429fc99c7c043e15db71c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}