{
  "manageEntity": {
    "action": "Save",
    "entityId": "1902409068",
    "entityType": "Track",
    "nonce": "0x84408f549d2965001782b8d742767608d4466811fca6be2f19df9a79ecfd1659",
    "signature": "0x496a144e288873b840b4846a8ecbadc13cdecdb05d3f015a9a2cccf780a840be282f52d0b7a6ffcdf71bb60f98efd942ebfee9a40193c3d04b990acd57cdb8771c",
    "signer": "0xa185Ff45de6FF68eAa1d7ceC338cba250810134c",
    "userId": "54166466"
  }
}