{
  "manageEntity": {
    "action": "Save",
    "entityId": "664725",
    "entityType": "Track",
    "nonce": "0xab9fe47fab6ab7f733da9b9d0bc5aed2c0abc5a3d61063829ca2493d2729030a",
    "signature": "0x3770456739b9b85ca484e0a03ba159904bf55c720c798235f2dbbcb37ba346d003c5954e4fa3b1892cf0323ce5f2e7b4942249d6922ecf051eb20d67c6a0aa671c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}