{
  "manageEntity": {
    "action": "Save",
    "entityId": "639755",
    "entityType": "Track",
    "nonce": "0xe28c163b8cb375e84f17ce96e1aa844a98c9c8951dffe9260d1405e496994bfa",
    "signature": "0xd04e69bc617309f2d2bfbd3efca89b39ce8285290c269fa62df432cce86a2a35148caab2543e1730fe32d2bd15c92e8674b8024835741287881a3d11ee0897ca1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}