{
  "manageEntity": {
    "action": "Save",
    "entityId": "18141223",
    "entityType": "Track",
    "nonce": "0x5ee96c74a6af6c21d410ceab5c2aca81584febac70dc9b57e19914176b46c641",
    "signature": "0x65932d4445528c4a437e8ac12506dc11e6f39645c1c3948fa9f293e487f950117be76dc3a4c01bbba96794bed3d27804cacb8c96baed0250ff32eacd7a3a09ab1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}