{
  "manageEntity": {
    "action": "Save",
    "entityId": "729624",
    "entityType": "Track",
    "nonce": "0x945a94fa1cee53d2fe5bf334ed2a93bdf1a40e0c6c811c81e1189ade39c192ed",
    "signature": "0x8f4f49f8e01f7ff7dba4be702016c2f214ee7e0849dc21fc63261cedd5e0b2c0370534fd45a779a1b36ca3c46e593d8032bcf1ee63688b303c145b5beda9ab2c1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}