{
  "manageEntity": {
    "action": "Save",
    "entityId": "1515730137",
    "entityType": "Track",
    "nonce": "1788932585658362681",
    "signature": "0x298829a20d9d03e60b38b327b2e6dffee81ab1af380803b34d3d93cd26e192fe1d2567421f6602829b958951dddad82c422feba22dc670902a251f62fe7227c01b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}