{
  "manageEntity": {
    "action": "Save",
    "entityId": "1600281919",
    "entityType": "Track",
    "nonce": "0xaf8985375afeeaae2eea9bd764ffeb6cfa354f83915ef5effc267a7bb8becbf5",
    "signature": "0x26349c3ef8d6c56f4db1f4bc31de6421f914c3144e8d88905de33cfc83ae73353bb2e1325b274373bb20386b4266e09ad528ff75ff8274e78c86524f0597a2121c",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}