{
  "manageEntity": {
    "action": "Save",
    "entityId": "474881839",
    "entityType": "Track",
    "nonce": "0xcc1fe20f2c63d4c3c2d571b217c1552a14b84e40f88ec77efb67fcd731f9e378",
    "signature": "0x3cf00190486f1d4b5833a64e4497de58a2d09e42a10c4bf39c824c61bdb281827272475966240a6690e91ac0893593486867fd3724f1937b640359387ff1be701c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}