{
  "manageEntity": {
    "action": "Save",
    "entityId": "135508",
    "entityType": "Track",
    "nonce": "0x58fdf2b453efbdc4d627350d2203b833bfe6c0971d3c62992c5b039d167ad7c1",
    "signature": "0x645a02c4179055da193742160e12499226c715434363321de99d3d3886efb6565e7831c4818e9a6f220c9a484c4f903409b842251b880e136185e06d84c2d4551c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}