{
  "manageEntity": {
    "action": "Save",
    "entityId": "1287756495",
    "entityType": "Track",
    "nonce": "0x757f23320d7e56d8129909254ff760c1ab4466eb9f89b089947ae5b62748a988",
    "signature": "0x2a6b20f5d2dc6d0da3ae3bcb5357e7f435b1501dcbd53d1a6758e2289df18bb41eb4ffd54d8093026a046b9c8271d9c2f6c56442d7dab9ffa83b5a16443cf0aa1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}